Membership of the ISC is open to any national academy, agency, scientific institution or other non-profit organisation. Any commercial organisation with an interest in the objectives and/or output of the Centre may become an Associate Member. Each member of the ISC is represented on the Governing Council, which is the ruling body of the ISC.
| Alaska Earthquake Center (AEC), University of Alaska Fairbanks, U.S.A. | Dr. Carl Tape | February 2020 | |
| AWE Blacknest, United Kingdom | | | |
| Belgian Science Policy Office (BELSPO), Belgium | Dr. Kris Vanneste | February 2021 | |
| Center for Earthquake Research and Information (CERI), the University of Memphis, U.S.A. | Dr. Mitch Withers | July 2024 | |
| Centre de Recherche en Astronomie, Astrophysique et Géophysique (CRAAG), Algeria | Dr. Hamoud Beldjoudi | March 2023 | |
| Centre of Geophysical Monitoring (CGM) of the National Academy of Sciences of Belarus | Prof. Arkady Aronov | January 2011 | |
| Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Mexico | Dr. Héctor González Huizar | January 2021 | |
| Centro Sismologico Nacional, Universidad de Chile | Dr. Sergio Barrientos | April 1995 | |
| Dublin Institute for Advanced Studies, Ireland | Dr. Martin Mollhoff | January 2019 | |
| Earth Observatory of Singapore (EOS), an autonomous Institute of Nanyang Technological University, Singapore | Asst. Prof Shengji Wei | September 2019 | |
| Environmental Agency of Slovenia | Tamara Jesenko | August 2023 | |
| Geological Survey Department, Cyprus | Mr Christodoulos Hadjigeorgiou | January 2021 | |
| Geological Survey of Israel | Dr. Nadav Wetzler | January 2020 | |
| Geophysics, Research School of Earth Sciences, Australian National University, Australia | Prof. Hrvoje Tkalcic | October 2023 | |
| Institut Cartogràfic i Geològic de Catalunya (ICGC), Spain | Dr. Josep Batllo | July 2017 | |
| Institute of Earth Physics and Space Science (EPSS), Hungarian Research Network (ELKH), Hungary | Mr Mate Timko | April 2021 | |
| Institute of Earth Sciences, Academia Sinica, Chinese Taipei | Dr. Bor-Shouh Huang | | |
| Institute of Geophysics, Czech Academy of Sciences, Czech Republic | Dr. Jaroslava Plomerova | January 1994 | |
| Institute of Geophysics, National University of Mexico | Dr. Xyoli Perez-Campos | | |
| Institute of Geophysics, Polish Academy of Sciences, Poland | Dr. Lukasz Rudzinski | September 2020 | |
| Institute of Geosciences, Polytechnic University of Tirana, Albania | Dr. Edmond Dushi | August 2024 | |
| Institute of Marine Sciences (ICM-CSIC), Spain | Dr. Antonio Villaseñor | June 2021 | |
| Institute of Radiological and Nuclear Safety (IRSN), joint authority of the Ministries of Defense, the Environment, Industry, Research, and Health, France | Dr. Aurore Laurendeau | October 2021 | |
| Iraqi Meteorological Organization and Seismology, Iraq | Dr. Salman Saddam Jasim | July 2024 | |
| Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Italy | Dr. Paolo Comelli | February 2023 | |
| Kandilli Observatory and Earthquake Research Institute, Turkey | Prof. Dr. Nurcan Ozel | May 2024 | |
| Korean Meterological Administration, Republic of Korea | Mr. Namchul (Gilbert) Woo | December 2018 | |
| Lamont-Doherty Earth Observatory, Columbia Climate School, Columbia University, U.S.A. | Prof. Goran Ekstrom | January 2023 | |
| Mavlyanov Institute of Seismology, Academy of Sciences, Republic of Uzbekistan | Dr. Murod Mirzaev | June 2024 | |
| National Defence Research Establishment (FOI), Sweden | Dr. Henrik Olsson | May 2024 | |
| National Institute for Earth Physics, Romania | Ms. Andreea Chircea | January 2023 | |
| National Institute of Geophysics, Geodesy and Geography (NIGGG), Bulgarian Academy of Sciences, Bulgaria | Prof. Dimcho Solakov | April 2019 | |
| National Institute of Polar Research (NIPR), Japan | Dr. Masaki Kanao | January 2014 | |
| National Research Institute for Astronomy and Geophysics (NRIAG), Cairo, Egypt | Dr. Sherif Mohamed El-Hady | March 2021 | |
| Observatorio Nacional, Brazil | Dr. Sergio Fontes | September 2019 | |
| Pacific Northwest Seismic Network (PNSN), U.S.A. | | | |
| Red Sísmica de Puerto Rico | Dr. Victor Huerfano | February 2010 | |
| Seismological Observatory, Institute of Geosciences, University of Brasilia, Brazil | Prof. Dr. George Sand Franca | October 2016 | |
| Soreq Nuclear Research Centre (SNRC), Israel | Dr. Yael Radzyner | March 2018 | |
| Texas Seismological Network (TexNet), Bureau of Economic Geology, J.A. and K.G. Jackson School of Geosciences, University of Texas at Austin, U.S.A. | Dr. Alexandros Savvaidis | November 2019 | |
| The Icelandic Meteorological Office, Iceland | | | |
| The Seismological Institute, National Observatory of Athens, Greece | Dr. Olga-Joan Ktenidou | May 2020 | |
| Universidade de São Paulo, Centro de Sismologia, Brazil | Dr. Marcelo Assumpcao | June 2015 | |
| University of the West Indies at Mona, Jamaica | Dr. Donovan Campbell | September 2019 | |
| University of Utah Seismograph Stations (UUSS), U.S.A. | Dr. Keith Koper | January 2020 | |