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2025-12-31-accounts

Charity registration number 1188971 (England and Wales)

INTERNATIONAL SEISMOLOGICAL CENTRE

ANNUAL REPORT AND UNAUDITED FINANCIAL STATEMENTS FOR THE YEAR ENDED 31 DECEMBER 2025

INTERNATIONAL SEISMOLOGICAL CENTRE

LEGAL AND ADMINISTRATIVE INFORMATION

Trustees Prof. J M Kendall Dr. J Schweitzer Assoc. Prof. Y An Prof. M Vallee Ms A Moseley Prof. Y Timoulali (Appointed 1 September 2025) Dr P Koelemeijer (Appointed 1 September 2025) Prof. Dr M de Bianchi (Appointed 1 September 2025) Director Dr. D A Storchak Charity number 1188971 Principal address Pipers Lane Thatcham Berkshire United Kingdom RG19 4NS

INTERNATIONAL SEISMOLOGICAL CENTRE

CONTENTS

Page
Trustees' report 1 - 5
Independent examiner's report 6
Statement of financial activities 7
Balance sheet 8
Statement of cash flows 9
Notes to the financial statements 10 - 19

INTERNATIONAL SEISMOLOGICAL CENTRE

TRUSTEES' REPORT FOR THE YEAR ENDED 31 DECEMBER 2025

The trustees present their report and financial statements for the year ended 31 December 2025.

The charity was registered as a Charitable Incorporated Organisation on 8 April 2020.

The Governing Council took the decision to move the operations of the centre into this registered charity on 31 December 2020. This provides a number of advantages to the organisation including formalising the legal status of the centre and the potential ability to access certain research funding which would not have been available to the centre in its previous form.

The financial statements have been prepared in accordance with the accounting policies set out in note one to the financial statements and comply with the Charity's governing document, the Charities Act 2011 and "Accounting and Reporting by Charities: Statement of Recommended Practice applicable to charities preparing their accounts in accordance with the Financial Reporting Standard applicable in the UK and Republic of Ireland (FRS 102) (effective 1 January 2019)".

Objectives

The Charity's object is to advance scientific knowledge of earthquakes and the structure of the Earth for the public benefit.

The policies adopted in furtherance of these objects include an open data availability policy endorsed by all Member-Institutions and Data Reporters, where appropriate.

The principal aims of the ISC, by which the aforementioned object is to be achieved, are:

The achievement of aims will gradually help to achieve its object through the availability of collected seismological data to scientific researchers worldwide.

Strategies

The strategies for achieving its stated aims and objectives include:

INTERNATIONAL SEISMOLOGICAL CENTRE

TRUSTEES' REPORT (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

The Charity uses the following criteria to assess success in the reporting period:

Activities

The trustees have paid due regard to guidance issued by the Charity Commission in deciding what activities the Charity should undertake.

Significant (main) activities undertaken to further the charity’s purposes for the public benefit:

Achievements and performance

In the year to 31 December 2025 income of £968,998 (2024: £1,529,075) was documented to be received. 2025 was a decrease of £623,077 on the previous year which is the result of concluding the formalisation of the NSF grant via the University of Oxford in 2024 after a long gap in NSF funding of the ISC. The NSF funds were awarded and accounted for in 2024, however the cash was not received by the charity until 2025.

A deficit of £75,008 (2024: suplus £536,399) was made, decreasing reserves to £1,814,036 (2024: £1,889,046)

(which includes land and buildings of £425,000).

The trustees consider the charity has continued to achieve its objectives and are satisfied with the performance for the year.

Factors which will effect performance

Significant positive factors that will effect the achievement of objectives include:

Significant negative factors that will effect the achievement of objectives include:

INTERNATIONAL SEISMOLOGICAL CENTRE

TRUSTEES' REPORT (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

Financial review

It is the policy of the Charity that unrestricted funds which have not been designated for a specific use should be maintained at a level equivalent to between nine and twelve months' expenditure (£790,000 to £1,055,000). The trustees consider that reserves at this level will ensure that, in the event of a significant drop in funding, they will be able to continue the Charity’s current activities while consideration is given to ways in which additional funds may be raised. This level of reserves has been maintained throughout the year.

Total reserves are all unrestricted and are currently £1,814,038 (2024: 1,889,046), including land and buildings of £425,000. Of this total £nil (2024: £312,295) is designated funds, representing NSF funding which has been allocated to meet operational costs in the period January to July 2025. Free reserves are therefore £1,814,038 (2023: £1,151,751), which is higher than the reserves policy states. This excess is held in anticipation of potential decreases in income in future years in view of economic downturn and geopolitical turbulence around the world.

Principal sources of income

The ISC is predominantly funded by Member-Institutions who contribute membership subscriptions on an annual basis. The ISC is also funded through work on projects, financed by public, commercial and international organizations such as the Comprehensive nuclear Test Ban Treaty Organization (CTBTO).

Such funding allows the ISC to maintain a free data availability policy in an environment where the ISC cannot sell its main product – the seismological data.

The trustees have assessed the major risks to which the Charity is exposed, and are satisfied that systems are in place to mitigate exposure to them.

Future plans and aims

The ISC aims and purposes will not change. The ISC is planning to continue its standard operations whilst enhancing its data and services to the research community. In particular, further work is planned to:

Future direction

Future direction including how experiences from past or current activities have influenced future plans and decisions about allocating resources to best effect is:

INTERNATIONAL SEISMOLOGICAL CENTRE

TRUSTEES' REPORT (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

Structure, governance and management

The Charity is a Charitable Incorporated Organisation (CIO).

The trustees who served during the year and up to the date of signature of the financial statements were: Prof. J H Woodhouse (Resigned 30 August 2025)

Prof. J M Kendall Dr. J Schweitzer Dr. S Tsuboi (Resigned 30 August 2025) Dr. X Perez Campos (Resigned 30 August 2025) Assoc. Prof. Y An Prof. M Vallee Ms A Moseley Prof. Y Timoulali (Appointed 1 September 2025) Dr P Koelemeijer (Appointed 1 September 2025) Prof. Dr M de Bianchi (Appointed 1 September 2025)

Recruitment and appointment of trustees

In line with the Constitution, the ISC work is overseen by the ISC Governing Council that consists of formal Representatives of Member-Institutions. The Council meets once in two years and appoints the Executive Committee (Board of Trustees) that oversees ISC work in between the meetings of the Governing Council.

The Executive Committee (Board of Trustees) consists of up to six elected members (from among the formal Representatives) and two nominated members (by the host institution, University of Oxford, and the professional organization IASPEI – the International Association of Seismology and Physics of the Earth’s Interior). Thus, up to eight persons are appointed to form the board of Trustees. Each elected Trustee is appointed to up to two terms of office and nominated Trustees are appointed until such time as the nominating body is willing to change them.

Organisational structure

Further to the above, the Governing Council appoints the Director who organises and oversees the work of the ISC, maintains good working relations with Member-Institutions and is responsible for hiring individual staff members.

Decision making

As explained above, different levels of decisions are delegated to different bodies. The Governing Council assesses the reports, provides direction of further work and approves the plans and budgets. The Executive Committee (Board of Trustees) oversees the work of the ISC on a more timely basis, scrutinises the finances and budgets, helps to direct resources to achieve the major goals set by the Governing Council. The Director runs the ISC in line with the set goals, manages the staff, expenditure and income, runs further fundraising activities by maintaining close contact with research community, data reporters, and members of the international organisations and relevant commercial companies interested in ISC data.

Major risks have been reviewed and systems have been established to manage those risks.

Induction and training of trustees

The Trustees are elected by the Governing Council in view of their scientific research specialisation and geographical representation. Once elected, the Trustees are provided with the set of documentation described in the Constitution. They are informed that their decisions are expected to be strictly governed by the benefit of the charity. Since not all Trustees are rotated at once, there is always a time period when the new Trustees are learning from the existing Trustees on the ways of work, policies maintained etc. The Chair of the Board of Trustees is always elected from among the elected Trustees.

INTERNATIONAL SEISMOLOGICAL CENTRE

INDEPENDENT EXAMINER'S REPORT

TO THE TRUSTEES OF INTERNATIONAL SEISMOLOGICAL CENTRE

I report to the trustees on my examination of the financial statements of International Seismological Centre (the Charity) for the year ended 31 December 2025.

Responsibilities and basis of report

As the trustees of the Charity you are responsible for the preparation of the financial statements in accordance with the requirements of the Charities Act 2011.

I report in respect of my examination of the Charity’s financial statements carried out under section 145 of the Charities Act 2011. In carrying out my examination I have followed the Directions given by the Charity Commission under section 145(5)(b) of the Charities Act 2011.

Independent examiner's statement

Since the Charity’s gross income exceeded £250,000 your examiner must be a member of a body listed in section 145 of the 2011 Act. I confirm that I am qualified to undertake the examination because I am a member of the Institute of Chartered Accountants in England and Wales, which is one of the listed bodies.

Your attention is drawn to the fact that the charity has prepared the financial statements in accordance with the relevant version of the Statement of Recommended Practice applicable to charities preparing their financial statements in accordance with the Financial Reporting Standard applicable in the UK and Republic of Ireland (FRS 102) in preference to the Accounting and Reporting by Charities: Statement of Recommended Practice issued on 1 April 2005 which is referred to in the extant regulations but has now been withdrawn. I understand that this has been done in order for the financial statements to provide a true and fair view in accordance with UK Generally Accepted Accounting Practice.

I have completed my examination. I confirm that no matters have come to my attention in connection with the examination giving me cause to believe that in any material respect:

I have no concerns and have come across no other matters in connection with the examination to which attention should be drawn in this report in order to enable a proper understanding of the financial statements to be reached.

Sam Thomas FCA For and on behalf of Azets Audit Services Gladstone House 77-79 High Street Egham Surrey TW20 9HY United Kingdom

Dated: .........................29 April 2026

INTERNATIONAL SEISMOLOGICAL CENTRE

STATEMENT OF FINANCIAL ACTIVITIES INCLUDING INCOME AND EXPENDITURE ACCOUNT FOR THE YEAR ENDED 31 DECEMBER 2025

Unrestricted Unrestricted
funds funds
2025 2024
Notes £ £
Income from:
Donations and legacies 3 951,306 1,543,434
Charitable activities 4 - 30,417
Investments 5 17,692 18,224
Total income 968,998 1,592,075
Expenditure on:
Charitable activities 6 1,003,127 1,045,660
Other 11 967 1,038
Total resources expended 1,004,094 1,046,698
Net (expenditure)/income for the year/
Net (outgoing)/incoming resources (35,096) 545,377
Other recognised gains and losses
Other gains or (losses) 12 (39,172) (8,978)
Net movement in funds (74,268) 536,399
Fund balances at 1 January 1,889,046 1,352,647
Fund balances at 31 December 1,814,778 1,889,046

The statement of financial activities includes all gains and losses recognised in the year. All income and expenditure derive from continuing activities.

202S 2024
Notes
Fixed assets
Tangibleassets 13 469.51B 448,449
Current assets
Debtors 14 101,904 780,183
Cash at bank and in hand 1,322,439 875.553
1.424.343 1,655.736
Creditors: amounts falling due within
one year 15 (79.083) (215,139)
Net current assets
Total assets less current liabilities
Income funds
unrestricted fund;
Designated funds 18 312,295
General unrestricted funds 1 814 778
1.814,778 1.8B9.046
1.8B9,046

INTERNATIONAL SEISMOLOGICAL CENTRE

STATEMENT OF CASH FLOWS FOR THE YEAR ENDED 31 DECEMBER 2025

Notes
Cash flows from operating activities
Cash generated from/(absorbed by)
operations
20
Investing activities
Purchase of tangible fixed assets
Investment income received
Net cash (used in)/generated from investing
activities
Net cash generated from financing activities
Net increase/(decrease) in cash and cash
equivalents
Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year		 2025
£
£
456,326
(27,132)
17,692
(9,440)
-
446,886
875,553
1,322,439		 2024
£
£
(78,633)
-
18,224
18,224
-
(60,409)
935,962
875,553

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS FOR THE YEAR ENDED 31 DECEMBER 2025

1 Accounting policies

Charity information

International Seismological Centre is a Charitable Incorporated Organisation, a public benefit entity registered in England and Wales.

1.1 Accounting convention

The financial statements have been prepared in accordance with the Charity's governing document, the Charities Act 2011 and "Accounting and Reporting by Charities: Statement of Recommended Practice applicable to charities preparing their accounts in accordance with the Financial Reporting Standard applicable in the UK and Republic of Ireland (FRS 102) (effective 1 January 2019)". The Charity is a Public Benefit Entity as defined by FRS 102.

The Charity has taken advantage of the provisions in the SORP for charities applying FRS 102 Update Bulletin 1 not to prepare a Statement of Cash Flows.

The financial statements are prepared in sterling, which is the functional currency of the Charity. Monetary amounts in these financial statements are rounded to the nearest £.

The financial statements have been prepared under the historical cost convention. The principal accounting policies adopted are set out below.

The financial statements have departed from the Charities (Accounts and Reports) Regulations 2008 only to the extent required to provide a true and fair view. This departure has involved following the Statement of Recommended Practice for charities applying FRS 102 rather than the version of the Statement of Recommended Practice which is referred to in the Regulations but which has since been withdrawn.

1.2 Going concern

At the time of approving the financial statements, the trustees have a reasonable expectation that the Charity has adequate resources to continue in operational existence for the foreseeable future. Thus the trustees continue to adopt the going concern basis of accounting in preparing the financial statements.

1.3 Charitable funds

Unrestricted funds are available for use at the discretion of the trustees in furtherance of their charitable objectives.

Restricted funds are subject to specific conditions by donors or grantors as to how they may be used. The purposes and uses of the restricted funds are set out in the notes to the financial statements.

1.4 Income

Income is recognised when the Charity is legally entitled to it after any performance conditions have been met, the amounts can be measured reliably, and it is probable that income will be received.

Cash donations are recognised on receipt. Other donations are recognised once the Charity has been notified of the donation, unless performance conditions require deferral of the amount.

Grants are recognised at the fair value of the asset received or receivable when there is reasonable assurance that the grant conditions will be met and the grants will be received.

A grant that specifies performance conditions is recognised in income when the performance conditions are met. Where a grant does not specify performance conditions it is recognised in income when the proceeds are received or receivable. A grant received before the recognition criteria are satisfied is recognised as a liability.

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

1 Accounting policies

(Continued)

1.5 Expenditure

Expenditure is recognised once there is a legal or constructive obligation to transfer economic benefit to a third party, it is probable that a transfer of economic benefits will be required in settlement, and the amount of the obligation can be measured reliably.

Expenditure is classified by activity. The costs of each activity are made up of the total of direct costs and shared costs, including support costs involved in undertaking each activity. Direct costs attributable to a single activity are allocated directly to that activity. Shared costs which contribute to more than one activity and support costs which are not attributable to a single activity are apportioned between those activities on a basis consistent with the use of resources. Central staff costs are allocated on the basis of time spent, and depreciation charges are allocated on the portion of the asset’s use.

1.6 Tangible fixed assets

Tangible fixed assets are initially measured at cost and subsequently measured at cost or valuation, net of depreciation and any impairment losses.

Freehold property received as a donation is recognised at its estimate fair value at the date of donation, and is not depreciated due to its high residual value.

Improvements to property

10 years straight line

The gain or loss arising on the disposal of an asset is determined as the difference between the sale proceeds and the carrying value of the asset, and is recognised in the statement of financial activities.

1.7 Impairment of fixed assets

At each reporting end date, the Charity reviews the carrying amounts of its tangible assets to determine whether there is any indication that those assets have suffered an impairment loss. If any such indication exists, the recoverable amount of the asset is estimated in order to determine the extent of the impairment loss (if any).

1.8 Cash and cash equivalents

Cash and cash equivalents include cash in hand, deposits held at call with banks, other short-term liquid investments with original maturities of three months or less, and bank overdrafts. Bank overdrafts are shown within borrowings in current liabilities.

1.9 Financial instruments

The Charity has elected to apply the provisions of Section 11 ‘Basic Financial Instruments’ and Section 12 ‘Other Financial Instruments Issues’ of FRS 102 to all of its financial instruments.

Financial instruments are recognised in the Charity's balance sheet when the Charity becomes party to the contractual provisions of the instrument.

Financial assets and liabilities are offset, with the net amounts presented in the financial statements, when there is a legally enforceable right to set off the recognised amounts and there is an intention to settle on a net basis or to realise the asset and settle the liability simultaneously.

Basic financial assets

Basic financial assets, which include debtors and cash and bank balances, are initially measured at transaction price including transaction costs and are subsequently carried at amortised cost using the effective interest method unless the arrangement constitutes a financing transaction, where the transaction is measured at the present value of the future receipts discounted at a market rate of interest. Financial assets classified as receivable within one year are not amortised.

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

1 Accounting policies

(Continued)

Basic financial liabilities

Basic financial liabilities, including creditors and bank loans are initially recognised at transaction price unless the arrangement constitutes a financing transaction, where the debt instrument is measured at the present value of the future payments discounted at a market rate of interest. Financial liabilities classified as payable within one year are not amortised.

Debt instruments are subsequently carried at amortised cost, using the effective interest rate method.

Trade creditors are obligations to pay for goods or services that have been acquired in the ordinary course of operations from suppliers. Amounts payable are classified as current liabilities if payment is due within one year or less. If not, they are presented as non-current liabilities. Trade creditors are recognised initially at transaction price and subsequently measured at amortised cost using the effective interest method.

Derecognition of financial liabilities

Financial liabilities are derecognised when the Charity’s contractual obligations expire or are discharged or cancelled.

1.10 Employee benefits

The cost of any unused holiday entitlement is recognised in the period in which the employee’s services are received.

Termination benefits are recognised immediately as an expense when the Charity is demonstrably committed to terminate the employment of an employee or to provide termination benefits.

1.11 Retirement benefits

Payments to defined contribution retirement benefit schemes are charged as an expense as they fall due.

2 Critical accounting estimates and judgements

In the application of the Charity’s accounting policies, the trustees are required to make judgements, estimates and assumptions about the carrying amount of assets and liabilities that are not readily apparent from other sources. The estimates and associated assumptions are based on historical experience and other factors that are considered to be relevant. Actual results may differ from these estimates.

The estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognised in the period in which the estimate is revised where the revision affects only that period, or in the period of the revision and future periods where the revision affects both current and future periods.

Critical judgements

Valuation of freehold property

The critical estimate in these accounts is the fair value ascribed to a freehold property donated from the predecessor organisation. The Trustees have made this estimate by comparison with the known sale price of commercial buildings of similar size, age, and type within the local area with the last year.

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

3 Donations and legacies

Unrestricted Unrestricted
funds funds
2025 2024
£ £
Grants receivable for core activities 271,044 907,287
Membership subscriptions 680,262 636,147
951,306 1,543,434
Grants receivable for core activities
CTBTO Link 103,530 98,385
GT 66,013 173,696
ISC-GEM 84,855 83,214
IR 5,889 5,750
MATLAB - 15,708
EEWS - 25,165
NSF Project - 504,369
General Sponsorship 10,757 1,000
271,044 907,287

4 Charitable activities

Sales within charitable activity:
Bulletins
BSM registration fees and sponsorship		 2025
£
-
-
-		 2024
£
5,530
24,887
30,417

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

5 Income from investments
Unrestricted Unrestricted
funds funds
2025 2024
£ £
Interest receivable 17,692 18,224
6 Charitable activities
2025 2024
£ £
Bulletin Summary costs 2,082 2,878
Share of support costs (see note 7) 990,792 1,023,474
Share of governance costs (see note 7) 10,253 19,308
1,003,127 1,045,660

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)

FOR THE YEAR ENDED 31 DECEMBER 2025

7 Support costs

Employment costs
Depreciation
Personnel costs
Building
maintenance
Local council
taxes
Staff travel
Committee travel
Computer costs
Insurance
Communications
BSM 2024
Other costs
Independent
examination
Audit fees
Professional fees
Accountancy
Analysed between
Charitable
activities		 2025
Support
costs
Governance
costs
£
£
852,886
-
6,063
-
33,067
-
33,336
-
4,492
-
19,934
-
5,043
-
21,203
-
9,100
-
2,098
-
-
-
3,570
-
-
2,000
-
-
-
4,583
-
3,670
990,792
10,253
990,792
10,253		 2024
Total
Support costs Governance
costs
£
£
£
852,886
866,846
-
6,063
3,350
-
33,067
17,273
-
33,336
28,121
-
4,492
4,308
-
19,934
34,207
-
5,043
15,203
-
21,203
26,532
-
9,100
6,935
-
2,098
986
-
-
13,899
-
3,570
5,814
-
2,000
-
-
-
-
12,500
4,583
-
3,558
3,670
-
3,250
1,001,045
1,023,474
19,308
1,001,045
1,023,474
19,308		 Total
£
866,846
3,350
17,273
28,121
4,308
34,207
15,203
26,532
6,935
986
13,899
5,814
-
12,500
3,558
3,250
1,042,782
1,042,782

Independant examination within accountancy is £2,000 (2024: £nil).

Audit fees are £nil (2024: £12,500) and for non audit services are £3,670 (2024: £3,250).

8 Net movement in funds 2025 2024
£ £
The net movement in funds is stated after charging/(crediting):
Fees payable for the independent examination of the charity's financial
statements 2,000
Fee payable for the audit of the charity's financial statements - 12,500
Depreciation of owned tangible fixed assets 6,063 3,350

9 Trustees

None of the trustees (or any persons connected with them) received any remuneration during the year.

Included in the £5,043 (2024: £15,203) Committee travel costs in note 7, are amounts of £4,363 reimbursed to three trustees (2024: £8,967 reimbursed to seven trustees) and £680 (2024: £6,236) paid direct to the supplier on the trustees' behalf.

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

10 Employees

The average monthly number of employees during the year was:

Employment costs
Wages and salaries
Social security costs
Other pension costs		 2025
Number
17
2025
£
705,989
79,038
67,859
852,886		 2024
Number
19
2024
£
727,100
72,705
67,041
866,846

During 2025 two (2024: four) interns were employed for a number of months.

The number of employees whose annual remuneration was more than £60,000 is as follows:

is as follows:
2025 2024
Number Number
£60,000 to £70,000 1 1
£70,000 to £80,000 1 -
£90,000 to £100,000 - 1
£110,000 to £120,000 1 -

Remuneration of key management personnel

The Trustees consider the key management personnel of the charity to be themselves and the Director. The remuneration of key management personnel (including employer's national insurance and employer's pension contributions) is as follows.

contributions) is as follows.
2025 2024
£ £
Aggregate compensation 110,268 108,479
11 Other
Unrestricted Unrestricted
funds funds
2025 2024
Financing costs (bank charges) 967 1,038

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

12 Other gains or losses
Unrestricted Unrestricted
funds funds
2025 2024
£ £
Foreign exchange losses/(gains) 39,172 8,978
13 Tangible fixed assets
Freehold land
Improvements		 Total
and buildings to property
£ £ £
Cost
At 1 January 2025 425,000 33,499 458,499
Additions - 27,132 27,132
At 31 December 2025 425,000 60,631 485,631
Depreciation and impairment
At 1 January 2025 - 10,050 10,050
Depreciation charged in the year - 6,063 6,063
At 31 December 2025 - 16,113 16,113
Carrying amount
At 31 December 2025 425,000 44,518 469,518
At 31 December 2024 425,000 23,449 448,449
14 Debtors
2025 2024
Amounts falling due within one year: £ £
Trade debtors (Members Subscriptions) 49,084 71,063
Other debtors 34,841 603,032
Prepayments and accrued income 17,979 106,088
101,904 780,183

Other debtors includes funding due from the NSF.

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

15 Creditors: amounts falling due within one year

Notes
Other taxation and social security
Deferred income
16
Trade creditors
Other creditors
Accruals		 2025
£
19,434
35,805
5,550
12,704
5,590
79,083		 2024
£
34,430
141,851
7,893
13,502
17,463
215,139

16 Deferred income

Arising from grants
Arising from member's contributions
Arising from corporate members		 2025
£
-
33,310
2,495
35,805		 2024
£
17,250
122,156
2,445
141,851

Contributions are usually invoiced in January for the year ahead. Several members prefer to pay earlier and as such deferred income arises.

17 Retirement benefit schemes

Defined contribution pension schemes

The Charity operates a defined contribution pension scheme for all qualifying employees. The assets of the scheme are held separately from those of the Charity in an independently administered fund.

The charge to profit or loss in respect of defined contribution pension schemes was £67,859 (2024 - £67,041).

18 Unrestricted funds

The unrestricted funds of the charity comprise the unexpended balances of donations and grants which are not subject to specific conditions by donors and grantors as to how they may be used. These include designated funds which have been set aside out of unrestricted funds by the trustees for specific purposes.

At
NSF funding
General funds		 1 January
2025
Incoming
resources
Resources
expended
Gains and
losses
At 31
December
2025
£
£
£
£
£
312,295
-
(312,295)
-
-
1,576,751
968,998
(691,799)
(39,172)
1,814,778
1,889,046
968,998
(1,004,094)
(39,172)
1,814,778		 1 January
2025
Incoming
resources
Resources
expended
Gains and
losses
At 31
December
2025
£
£
£
£
£
312,295
-
(312,295)
-
-
1,576,751
968,998
(691,799)
(39,172)
1,814,778
1,889,046
968,998
(1,004,094)
(39,172)
1,814,778
1,814,778

INTERNATIONAL SEISMOLOGICAL CENTRE

NOTES TO THE FINANCIAL STATEMENTS (CONTINUED) FOR THE YEAR ENDED 31 DECEMBER 2025

18
Unrestricted funds
Previous year:
At
NSF funding
General funds		 (Continued)
1 January
2024
Incoming
resources
Resources
expended
Gains and
losses
At 31
December
2024
£
£
£
£
£
-
312,295
-
-
312,295
1,352,647
1,279,780
(1,046,698)
(8,978)
1,576,751
1,352,647
1,592,075
(1,046,698)
(8,978)
1,889,046

Designated funds relate to an NSF funding award made to the charity during 2024. These funds have been ring-fenced to meet certain operating costs in the period January to July 2025. As such, the trustees do not consider them to be part of the general unrestriced reserves of the charity.

19 Related party transactions

Transactions with related parties

All trustees of the charity are drawn from member institutions. Membership fees from such institutions totalled £183,770 (2024: £191,425). Amounts relating to 2025 membership fees outstanding at the year end totalled £nil (2024: £79,000). These amounts were invoiced in December 2024, but were not due for payment until 2025.

Disclosure of reimbursed expenses made to trustees are made in note 9.

20
Cash generated from/(absorbed by) operations
(Deficit)/surplus for the year
Adjustments for:
Investment income recognised in statement of financial activities
Foreign exchange differences
Depreciation and impairment of tangible fixed assets
Movements in working capital:
Decrease/(increase) in debtors
(Decrease)/increase in creditors
(Decrease)/increase in deferred income
Cash generated from/(absorbed by) operations		 2025
£
(35,096)
(17,692)
(39,172)
6,063
678,279
(30,010)
(106,046)
456,326		 2024
£
545,377
(18,224)
(8,978)
3,350
(750,652)
28,479
122,015
(78,633)

21 Analysis of changes in net funds

The Charity had no material debt during the year.