DISCRIMINATION OF EARTHQUAKES AND EXPLOSIONS IN SOUTHERN RUSSIA USING REGIONAL HIGH-FREQUENCY THREE-COMPONENT DATA FROM THE IRIS/JSP CAUCASUS NETWORK
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dc.contributor.author | Kim W.Y. | |
dc.contributor.author | Aharonian V. | |
dc.contributor.author | Lerner-Lam A.L. | |
dc.contributor.author | Richards P.G. | |
dc.date.accessioned | 2020-12-14T06:59:00Z | |
dc.date.available | 2020-12-14T06:59:00Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=31750009 | |
dc.identifier.citation | Bulletin of the Seismological Society of America, 1997, , 3, 569-588 | |
dc.identifier.issn | 0037-1106 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20686 | |
dc.description.abstract | High-frequency regional records from small earthquakes (magnitude <4.5) and comparable magnitude chemical explosions are analyzed to find a reliable seismic discriminant in southern Russia near Kislovodsk. The digital, three-component seismograms recorded during 1992 by the Caucasus Network operated by Lamont-Doherty Earth Observatory since 1991 in the distance ranges 15 to 233 km are used. Mean vertical-component Pg/Lg spectral amplitude ratios in the band 8 to 18 Hz are about 1.3 and 3.2 for earthquakes and explosions, respectively, in this region. We find that the vertical-component Pg/Lg spectral ratio in the frequency band 8 to 18 Hz serves quite well for classifying these events. A linear discriminant function analysis indicates that the Pg/Lg spectral ratio method provides discrimination power with a total misclassification probability of about 7%. The Pg/Lg spectral ratios of rotated, three-component regional records improve the discrimination power of the spectral ratio method over the vertical-component Pg/Lg ratios. Preliminary analysis indicates that distance-corrected vertical-component Pg/Lg ratios improve the discrimination power by about 4% over uncorrected ratios. But we find that an even better discriminant is the Pg/Lg spectral ratio of the three-component regional records corrected for the free-surface effect. In the frequency band 8 to 18 Hz, the free-surface-corrected three-component Pg/Lg spectral ratio provides discrimination power with a total misclassification probability of only 2.6%. Free-surface-corrected and network-averaged Pg/Lg spectral ratios provide transportability of the spectral ratio method to various regions worldwide. | |
dc.title | DISCRIMINATION OF EARTHQUAKES AND EXPLOSIONS IN SOUTHERN RUSSIA USING REGIONAL HIGH-FREQUENCY THREE-COMPONENT DATA FROM THE IRIS/JSP CAUCASUS NETWORK | |
dc.type | Статья |
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