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Depth corrections to surface-wave magnitudes for intermediate and deep earthquakes in the regions of North Eurasia

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Abstract

This paper reports a study of surface wave MS,MOS magnitudes from the seismological catalog derived from teleseismic stations of the Geophysical Survey of the Russian Academy of Sciences (GS RAS) with aim of determination of depth corrections to MS and subsequent standardization of the catalogs with regard to MS. Unlike the MS reported by major international centers, such as National Earthquake Information Center of United States Geological Survey (NEIC USGS) and the International Seismological Centre (ISC), for earthquakes occurring at shallow and crustal depths up to 50–60 km, MS,MOS is also determined for intermediate-depth and deep earthquakes. The analysis of depth corrections to MS was based on MS,MOS from the GS RAS Seismological Catalog and MW from the ISC-GEM (Global Earthquake Model) Catalogue for 736 earthquakes of North Eurasia with MW ≥ 5.5 for the period 1988 through 2014. It was found that the decrease in MS,MOS with increasing depth becomes noticeable for h > 40 km. For the earthquakes of h > 40 km, we found two increasing log linear relations for the correction of MS,MOS as function of depth: ΔMS,MOS(h) = 1.71·log(h) − 2.726 for h = 40–90 km and ΔMS,MOS(h) = 0.556·lg(h)− 0.508 for h > 90 km. We applied these corrections to MS,MOS and found a substantially better correlation and lower standard errors in the MS,MOS vs MW relation. Applying the corrections to MS,MOS of the Okhotsk Sea earthquake on May 24, 2013, h = 617 km showed a good agreement between the corrected MS,MOS = 8.4 and MW = 8.3.

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Acknowledgments

The authors thank K. Mackey and anonymous reviewers for constructive comments and rigorous questions which made this paper more clear and justified.

Data and resources

The ISC Bulletin is available from http://www.isc.ac.uk/ (last accessed July 2019); ISC-GEM Catalog is available from http://www.isc.ac.uk/iscgem/ (last accessed July 2019); GS RAS Seismological Catalog (Teleseismic stations network) for 1993–2019 and GS RAS Seismological Bulletin (Teleseismic stations network) for 2006–2019 are available from http://www.ceme.gsras.ru/cgi-bin/new/catalog.pl (last accessed July 2019); Global Centroid Moment Tensor Project is available from https://www.globalcmt.org (last accessed July 2019); Special Catalog of Earthquakes of the Northern Eurasia (SECNE) is available from http://www.seismo.ethz.ch/static/gshap/neurasia/nordasiacat.txt (last accessed July 2019).

Funding

Funding this research was provided by the project no. AAAA-A16–116070550060-7 from 05/07/2016.

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  1. Geophysical Survey of the Russian Academy of Sciences, Lenin Ave. 189, Obninsk, Russia, 249035

    Nataliya V. Petrova & Irina P. Gabsatarova

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  1. Nataliya V. Petrova
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  2. Irina P. Gabsatarova
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Correspondence to Nataliya V. Petrova.

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Petrova, N.V., Gabsatarova, I.P. Depth corrections to surface-wave magnitudes for intermediate and deep earthquakes in the regions of North Eurasia. J Seismol 24, 203–219 (2020). https://doi.org/10.1007/s10950-019-09900-8

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