Withdrawn: Use of the SCARDEC Method for Monitoring and Research Applications
Using teleseismic body waves, the SCARDEC method (Vallée et al., GJI, 2011) provides simultaneous access to some classical earthquake parameters (moment magnitude, depth, focal mechanism) and to the Source Time Functions (STFs). With a magnitude threshold at 5.5-6, about 200 earthquakes are characterized each year with this approach, which highly relies on the Earth coverage provided by the global-oriented broadband seismic networks (in particular GSN, Geoscope and Geofon). Since 2014, SCARDEC has been implemented in near-real time by the Geoscope Observatory with the help of the IPGP data center. Solutions are determined ~45 minutes after origin time and disseminated through the Geoscope website, mailing lists and twitter (account @geoscope_ipgp).
This presentation first reviews the interests of the SCARDEC information for monitoring purposes. Based on comparisons with other methods (in particular GCMT), it will be shown that first-order source parameters determined in near-real time are robust, which gives additional confidence to the STF determinations. STFs themselves are useful to rapidly detect uncommon and possibly hazardous earthquakes, such as multi-source or tsunamigenic events. Besides monitoring, STFs also provide valuable information for the analysis of the seismic source process, which motivated the constitution of an STF database gathering all the earthquakes since the beginning of the 1990’s (Vallée and Douet, PEPI, 2016; http://scardec.projects.sismo.ipgp.fr/). This database currently has close to 4000 earthquake STFs, allowing for exhaustive analyses of the source process. Systematic STF determinations are finally useful for structure studies requiring waveform modeling at periods shorter than the source duration.
Session: Network Seismology: Recent Developments, Challenges and Lessons Learned [Poster]
Type: Poster
Room: Evergreen Ballroom
Date: 4/22/2022
Presentation Time: 08:00 AM Pacific
Presenting Author: Martin Vallee
Student Presenter: No
Additional Authors
Martin Vallee Presenting Author Corresponding Author vallee@ipgp.fr Institut de Physique Du Globe de Paris |
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Withdrawn: Use of the SCARDEC Method for Monitoring and Research Applications
Session
Network Seismology: Recent Developments, Challenges and Lessons Learned
Description