ISC-EHB Dataset for 1964 to 2017: Complementing the Bulletin with In-House Depth Phase Picks
Session: Back to the Future: Innovative New Research with Legacy Seismic Data [Poster]
Type: Poster
Date: 4/19/2021
Presentation Time: 11:30 AM Pacific
Description:
The original EHB dataset, as developed with procedures described by Engdahl et al. (1998), has been widely used in the past in various types of earth science studies. The original EHB stopped in 2008, and since then the volume and quality of data has significantly improved. To take this into account we have re-constructed the ISC-EHB dataset for the period 1964-2017 with the updated criteria defined in Weston et al. (2018). Event selection for the ISC-EHB is made from the Reviewed ISC Bulletin, and ISC Bulletin relies on data contributed by seismological agencies from around the world. In the past decade there has been a consistent decline in the number of depth phase picks reported to the ISC. Depth phases are crucial for the ISC-EHB dataset as they directly influence the quality of the depth constraint. In order to address this issue, we have been routinely picking depth phases for earthquakes across the globe with mbNEIC ≥ 4.8 recorded at 28°-72° distance range and data period from April 2016 using SeisAn Earthquake analysis software (Havskov and Ottemoller, 1999).
In this contribution we describe the procedures used to construct the newly refined ISC-EHB dataset covering earthquakes from 1964 to 2017. We also illustrate noteworthy features in several regions, including some of those presented in Engdahl et al. (2020). The ISC-EHB now includes 177,416 earthquakes with prime magnitude > 3.75. This advanced dataset of well-recorded seismic events can be used for regional and global seismicity and tomographic studies, especially in subduction zones where significant spatial and structural characteristics are revealed. The ISC-EHB is now one of the most refined global seismicity catalogues and is freely available from the ISC website (www.isc.ac.uk/isc-ehb), where seismicity maps and cross sections along all subduction zones are shown. The ISC-EHB dataset will be extended beyond the data year 2017 as soon as the review of each following annual ISC Bulletin is completed.
Presenting Author: Burak Sakarya
Student Presenter: No
Authors
Burak Sakarya Presenting Author Corresponding Author burak@isc.ac.uk International Seismological Centre |
Eric Engdahl bob.engdahl@colorado.edu University of Colorado |
Charikleia Gkarlaouni hara@isc.ac.uk International Seismological Centre |
Thomas Garth tom.garth@isc.ac.uk International Seismological Centre |
Peter Franek peterf@isc.ac.uk International Seismological Centre |
James Harris james@isc.ac.uk International Seismological Centre |
Domenico Di Giacomo domenico@isc.ac.uk International Seismological Centre |
Dmitry Storchak dmitry@isc.ac.uk International Seismological Centre |
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ISC-EHB Dataset for 1964 to 2017: Complementing the Bulletin with In-House Depth Phase Picks
Category
General Session