Geothenes: public copy of the earthquake table under CC BY-SA 3.0 Download page: https://geothenes.com/static/data-sources.html#downloads earthquakes_ccbysa.csv.gz earthquakes since 1900, gzipped UTF-8 CSV README-CC-BY-SA.txt this notice LICENCE earthquakes_ccbysa.csv.gz is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported licence (CC BY-SA 3.0): https://creativecommons.org/licenses/by-sa/3.0/ The table includes rows from the ISC-GEM catalogue, which is published under CC BY-SA 3.0, so Geothenes shares the whole adapted table under that licence. You may copy, share and adapt it, including commercially, as long as you give the attribution below, indicate any changes you make, and share what you adapt under the same licence. Geothenes imposes no additional restrictions on this data: its own terms of service do not limit what the licence allows. Each row also says which producers' terms its values carry (LICENCE OF EACH ROW). ATTRIBUTION Credit, word for word: Earthquakes: USGS ANSS Comprehensive Catalog (ComCat; USGS public domain, ANSS partner networks, Global CMT), including ISC-GEM catalogue rows © International Seismological Centre and GEM Foundation, CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0/); GeoNet rows © Earth Sciences New Zealand, CC BY 3.0 NZ (https://creativecommons.org/licenses/by/3.0/nz/): "We acknowledge the New Zealand GeoNet programme and its sponsors NHC, Earth Sciences NZ, LINZ, NEMA and MBIE for providing data/images used in this study."; NRCan rows: Contains information licensed under the Open Government Licence – Canada. (https://open.canada.ca/en/open-government-licence-canada); table adapted by Geothenes and shared under CC BY-SA 3.0. This table was adapted by Geothenes: filtered and reformatted (https://geothenes.com). ISC-GEM, the producer's notice word for word (the double space is ISC's own): The Catalogue is protected by the Copyright (C) 2025 International Seismological Centre and GEM Foundation. You may use this work under the terms of the CC-BY-SA 3.0 (unported) Citation: International Seismological Centre (2026), ISC-GEM Earthquake Catalogue, https://doi.org/10.31905/d808b825 ISC also asks users to cite: - Storchak, D.A., D. Di Giacomo, I. Bondár, E.R. Engdahl, J. Harris, W.H.K. Lee, A. Villaseñor and P. Bormann (2013). Public Release of the ISC-GEM Global Instrumental Earthquake Catalogue (1900-2009). Seism. Res. Lett., 84, 5, 810-815, doi: 10.1785/0220130034. - Storchak, D.A., D. Di Giacomo, E.R. Engdahl, J. Harris, I. Bondár, W.H.K. Lee, P. Bormann and A. Villaseñor (2015). The ISC-GEM Global Instrumental Earthquake Catalogue (1900-2009): Introduction, Phys. Earth Planet. Int., 239, 48-63, doi: 10.1016/j.pepi.2014.06.009. - Di Giacomo, D., E.R. Engdahl and D.A. Storchak (2018). The ISC-GEM Earthquake Catalogue (1904–2014): status after the Extension Project, Earth Syst. Sci. Data, 10, 1877-1899, doi: 10.5194/essd-10-1877-2018. - Bondár, I., E.R. Engdahl, A. Villaseñor, J. Harris and D.A. Storchak, 2015. ISC-GEM: Global Instrumental Earthquake Catalogue (1900-2009): II. Location and seismicity patterns, Phys. Earth Planet. Int., 239, 2-13, doi: 10.1016/j.pepi.2014.06.002. - Di Giacomo, D., I. Bondár, D.A. Storchak, E.R. Engdahl, P. Bormann and J. Harris (2015a). ISC-GEM: Global Instrumental Earthquake Catalogue (1900-2009): III. Re-computed MS and mb, proxy MW, final magnitude composition and completeness assessment, Phys. Earth Planet. Int., 239, 33-47, doi: 10.1016/j.pepi.2014.06.005. USGS ANSS Comprehensive Catalog (ComCat): U.S. Geological Survey, Earthquake Hazards Program, 2017, Advanced National Seismic System (ANSS) Comprehensive Catalog of Earthquake Events and Products: Various, https://doi.org/10.5066/F7MS3QZH. USGS-authored or produced data and information are considered to be in the U.S. Public Domain. (https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits) Credit: U.S. Geological Survey ANSS partner networks (ANSS Data and Products Policy, https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/atoms/files/ANSS_Data_Products_Policy1.pdf): 3. Recorded data and associated metadata shall be deposited at, and distributed through, existing data management centers and facilities. Data so deposited and distributed must be clearly attributed to the ANSS or to appropriate participating partners. Global CMT (moment magnitudes; https://www.globalcmt.org/CMTcite.html): The Global CMT project is a research activity funded by the National Science Foundation, and we greatly appreciate users of the catalog including appropriate citations to our work in their published articles. - Dziewonski, A. M., T.-A. Chou and J. H. Woodhouse, Determination of earthquake source parameters from waveform data for studies of global and regional seismicity, J. Geophys. Res., 86, 2825-2852, 1981. doi:10.1029/JB086iB04p02825 - Ekström, G., M. Nettles, and A. M. Dziewonski, The global CMT project 2004-2010: Centroid-moment tensors for 13,017 earthquakes, Phys. Earth Planet. Inter., 200-201, 1-9, 2012. doi:10.1016/j.pepi.2012.04.002 GeoNet (Earth Sciences New Zealand; https://creativecommons.org/licenses/by/3.0/nz/): GeoNet content is copyright Earth Sciences New Zealand and is licensed under a Creative Commons Attribution 3.0 New Zealand License. We acknowledge the New Zealand GeoNet programme and its sponsors NHC, Earth Sciences NZ, LINZ, NEMA and MBIE for providing data/images used in this study. Natural Resources Canada, Earthquakes in Canada archive (https://open.canada.ca/en/open-government-licence-canada): Contains information licensed under the Open Government Licence – Canada. LICENCE OF EACH ROW row_license gives the licence of the values in a row (a row takes the more demanding licence of its origin and its magnitude); row_license_url links its terms: - US-PD (67,340 rows): origin and magnitude from U.S. federal sources (USGS incl. USHIS / OFFICIAL compilations, NOAA) https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits - ComCat-open (29,654 rows): an ANSS partner network or Global CMT value (ANSS Data and Products Policy: available for all appropriate purposes, attribute to ANSS or the partner; GCMT: no licence stated, citation appreciated); rest U.S. public domain https://www.usgs.gov/media/files/anss-data-and-products-policy - CC-BY-SA-3.0 (17,775 rows): an ISC-GEM value (origin, magnitude or event); CC BY-SA 3.0 Unported https://creativecommons.org/licenses/by-sa/3.0/ - OGL-Canada-2.0 (212 rows): a value from NRCan's 'Earthquakes in Canada' archive; Open Government Licence - Canada https://open.canada.ca/en/open-government-licence-canada - CC-BY-3.0-NZ (154 rows): a GeoNet (Earth Sciences New Zealand) value; CC BY 3.0 NZ, acknowledgement requested https://creativecommons.org/licenses/by/3.0/nz/ WHAT GEOTHENES CHANGED From the USGS ComCat event service, Geothenes - kept events of type earthquake from 1900-01-01 up to (not including) 2026-10-21: magnitude 5 or more anywhere, and 4.5 to under 5 inside four US boxes (conus: latitude 24 to 50, longitude -125 to -66; alaska: latitude 50 to 72, longitude 172 to 180 and -180 to -130; hawaii: latitude 18 to 23, longitude -161 to -154; puerto_rico: latitude 17 to 19.5, longitude -68.5 to -64); - left out ComCat's free-text place column; - replaced each origin or magnitude whose producer's terms forbid commercial use, or could not be checked, with an allowlisted value of the same event (921 rows; resourced_from says which), took Canadian values from NRCan's Open Government Licence archive instead of ComCat's copies, and dropped the 381 events that had no allowlisted replacement; - added year, subset, us_region, is_iscgem, catalog, row_license, resourced_from and, in this file, row_license_url; - wrote it as CSV, ordered by time_utc then event_id. FILE 115,135 rows, one per earthquake. Gzipped UTF-8 CSV with a header row; empty cells are missing values. Columns (name, meaning): event_id ComCat event id, e.g. se609212 or iscgem912519; unique time_utc origin time, UTC, ISO 8601 to the millisecond year year of time_utc lat epicentre latitude, degrees (WGS84) lon epicentre longitude, degrees (WGS84), -180 to 180 depth_km hypocentre depth, km; empty when unknown, can be slightly negative mag magnitude, 2 decimals: ComCat's preferred one, or an allowlisted replacement mag_type magnitude type (mw, mww, mb, ms, ml, ...): the scales are mixed net the event's preferred contributing network in ComCat location_source producer of the origin stored here (ComCat code; nrcan_ogl = NRCan's OGL archive) mag_source producer of the magnitude stored here (same codes) status reviewed or automatic, as ComCat flags the event subset global_m5 (M5 or more anywhere) or us_m4.5 (M4.5 to under 5 inside a US box) us_region conus, alaska, hawaii or puerto_rico: the US box the epicentre falls in (boxes are rectangles and include parts of Canada, Mexico and the sea); empty elsewhere is_iscgem true when the origin, the magnitude or the event comes from ISC-GEM (CC BY-SA 3.0) catalog iscgem, iscgemsup or comcat row_license licence of the row's values (LICENCE OF EACH ROW below) resourced_from empty, or which ComCat values Geothenes replaced and whose they were, e.g. location:guc;magnitude:guc row_license_url the licence or terms page for row_license (added in this file) Caveats: magnitudes are on mixed scales; completeness improves with time (early decades hold mainly large events); events before 1900 are not included, and 1900-1903, Chile and Japan have gaps where values were dropped for licensing. ComCat's use constraint, word for word: The data you have secured from the ANSS Comprehensive Catalog may include data that have not received Director’s approval and as such are provisional and subject to revision. The data are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use Geothenes is not affiliated with or endorsed by the U.S. Geological Survey, ANSS, the International Seismological Centre, the GEM Foundation, Global CMT, Earth Sciences New Zealand (GeoNet) or Natural Resources Canada. Provided as is, without warranty of any kind.