Enriching the GEOFON seismic catalog with automatic energy magnitude estimations
<p>We present a seismic catalog (<span class="cit" id="xref_altparen.1"><a href="#bib1.bibx5">Bindi et al.</a>, <a href="#bib1.bibx5">2024</a></span>, <span class="uri">https://doi.org/10.5880/GFZ.2.6.2...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2024-04-01
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| Series: | Earth System Science Data |
| Online Access: | https://essd.copernicus.org/articles/16/1733/2024/essd-16-1733-2024.pdf |
| Summary: | <p>We present a seismic catalog (<span class="cit" id="xref_altparen.1"><a href="#bib1.bibx5">Bindi et al.</a>, <a href="#bib1.bibx5">2024</a></span>, <span class="uri">https://doi.org/10.5880/GFZ.2.6.2023.010</span>) including energy magnitude <span class="inline-formula"><i>M</i><sub>e</sub></span> estimated from P waves recorded at teleseismic distances in the range <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">20</mn><mi mathvariant="italic">°</mi><mo>≤</mo><mi mathvariant="normal">Δ</mi><mo>≤</mo><mn mathvariant="normal">98</mn><mi mathvariant="italic">°</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="68pt" height="11pt" class="svg-formula" dspmath="mathimg" md5hash="47d97d015fbcd876b0db6344b9b65b53"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="essd-16-1733-2024-ie00001.svg" width="68pt" height="11pt" src="essd-16-1733-2024-ie00001.png"/></svg:svg></span></span> and for depths shorter than 80 km. The catalog is built starting from the event catalog disseminated by GEOFON (GEOFOrschungsNetz), considering 6349 earthquakes with moment magnitude <span class="inline-formula"><i>M</i><sub>w</sub>≥5</span> occurring between 2011 and 2023. Magnitudes are computed using 1 031 396 freely available waveforms archived in EIDA (European Integrated Data Archive) and IRIS (Incorporated Research Institutions for Seismology) repositories, retrieved through the standard International Federation of Digital Seismograph Networks (FDSN) web services (<span class="uri">https://www.fdsn.org/webservices/</span>, last access: March 2024). A reduced, high-quality catalog for events with <span class="inline-formula"><i>M</i><sub>w</sub>≥5.8</span> and from which stations and events with only few recordings were removed forms the basis of a detailed analysis of the residuals of individual station measurements, which are decomposed into station- and event-specific terms and a term accounting for remaining variability. The derived <span class="inline-formula"><i>M</i><sub>e</sub></span> values are compared to <span class="inline-formula"><i>M</i><sub>w</sub></span> computed by GEOFON and with the <span class="inline-formula"><i>M</i><sub>e</sub></span> values calculated by IRIS. Software and tools developed for downloading and processing waveforms for bulk analysis and an add-on for SeisComP for real-time assessment of <span class="inline-formula"><i>M</i><sub>e</sub></span> in a monitoring context are also provided alongside the catalog. The SeisComP add-on has been part of the GEOFON routine processing since December 2021 to compute and disseminate <span class="inline-formula"><i>M</i><sub>e</sub></span> for major events via the existing services.</p> |
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| ISSN: | 1866-3508 1866-3516 |