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Discussion papers | Copyright
https://doi.org/10.5194/essd-2018-59
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  02 Aug 2018

02 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

The ISC-GEM Earthquake Catalogue (1904–2014): status after the Extension Project

Domenico Di Giacomo1, E. Robert Engdahl2, and Dmitry A. Storchak1 Domenico Di Giacomo et al.
  • 1International Seismological Centre (ISC), Pipers Lane, Thatcham, Berkshire, RG19 4NS, UK
  • 2University of Colorado, Boulder, CO, USA

Abstract. We outline the work done to extend and improve the ISC-GEM Global Instrumental Earthquake Catalogue, which was first released in 2013 (Storchak et al., 2013, 2015). Due to time and resource limitations, version 1 (V1) of the ISC-GEM Catalogue included global earthquakes selected according to time dependent cut-off magnitudes between 1900 and 2009: 7.5 and above before 1918 (plus significant 6.5 and above continental earthquakes); 6.25 between 1918 and 1959; 5.5 from 1960 onwards. With the Extension Project we added both pre-1960 events below the original cut-off magnitudes (if enough station data was available to perform relocation and magnitude re-computation) and added magnitude 5.5 and above events from 2010 to 2014. The project ran over a 4-year period where a new version of the ISC-GEM Catalogue was released each year via the ISC website (www.isc.ac.uk/iscgem/). For each year not only have we added new events to the catalogue for a given time range but also revised events already in V1 if additional data became available or location and/or magnitude reassessments were required. Here we recall the general background behind the production of the ISC-GEM Catalogue and describe the features of the different periods where the catalogue has been extended. Compared to the 2013 release, the new version (V5) of the ISC-GEM Catalogue now contains about 12,000 more events between 1904 and 1960 and ends in 2014 instead of 2009.We expect the ISC-GEM Catalogue to continue to be one of the most useful datasets for studies of the Earth’s global seismicity and an important benchmark for seismic hazard analyses, and, ultimately, an asset for the seismological community as well as other geoscience fields, education and outreach activities. The ISC-GEM Catalogue is freely available at http://doi.org/10.31905/D808B825.

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Short summary
We outline the work done to improve and extend the new reference catalogue of global earthquakes instrumentally recorded since 1904, the ISC-GEM Catalogue. We have added thousands of earthquakes between 1904 and 1959 and in recent years compared to the 2013 release. As earthquake catalogues are widely used for different aspects of research, we believe that this dataset will be instrumental for years to come to researchers involved in seismic hazard and patterns of the Earth's seismicity studies.
We outline the work done to improve and extend the new reference catalogue of global earthquakes...
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