Focal mechanism of the Kaliningrad earthquake of 21 September 2004 based on waveform inversion using a limited number of stations

IF 0.5 4区地球科学 Q4 GEOLOGY

Baltica Pub Date : 2021-01-01 DOI:10.5200/baltica.2021.1.8

V. Nikulins, D. Malytskyy

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引用次数: 1

Abstract

The focal-mechanism solution for the second shock of the Kaliningrad earthquake on 21 September 2004 (13:32 UTC) with a magnitude of Mw 5.2 was obtained using the waveform inversion (WFI) method. The method was used with the aim of its subsequent application as a discriminator in the East Baltic region for recognizing the genesis of seismic events based on data from a limited number of stations. The WFI method was tested by broadband channels. The results of focal-mechanism solution (strike = 119°; dip = 73°; rake = –163°) allowed (1) to state the source mechanism as a right-lateral strike-slip, (2) to estimate the optimal source depth equal to 3.0 km, and (3) to estimate the parameters of the compression axes (Paz = 340°; Ppl = 29°), tension (Taz = 252°; Tpl = 1°) and the axis coinciding with the intersection of two nodal planes (Baz = 162°; Bpl = 66°). These results are in satisfactory agreement with the results of the leading seismological agencies. Seismotectonic analysis showed that the epicentre of the earthquake is located inside the structure formed by the Yantarnensk fault zone and the zone of the Bakalinsk ruptured flexure. The WFI method showed its potential use as a discriminator of the genesis of seismic events.

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基于有限台站波形反演的2004年9月21日加里宁格勒地震震源机制

利用波形反演(WFI)方法，获得了2004年9月21日(世界标准时间13:32)加里宁格勒5.2级地震的震源机制解。使用该方法的目的是随后在东波罗的海地区作为鉴别器，根据有限数量台站的数据识别地震事件的起因。通过宽带信道对WFI方法进行了测试。焦点机构解的结果(strike = 119°;倾角= 73°;(2)估计最优震源深度为3.0 km，(3)估计压缩轴的参数(Paz = 340°;Ppl = 29°)，张力(Taz = 252°;Tpl = 1°)和与两节面交点重合的轴(Baz = 162°;Bpl = 66°)。这些结果与主要地震机构的结果吻合得很好。地震构造分析表明，此次地震的震中位于扬塔涅斯克断裂带和巴卡林斯克断裂弯曲带形成的构造内。WFI方法显示了它作为地震事件成因鉴别器的潜在用途。

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来源期刊

Baltica 地学-地质学

CiteScore

1.30

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： BALTICA is an international periodical journal on Earth sciences devoted to the Baltic countries region and the Baltic Sea problems. This edition as a Yearbook is established in 1961 by initiative of Academician Vytautas Gudelis. Since 1993, an Editor-in-Chief of the journal became Academician Algimantas Grigelis. BALTICA is published biannually (in June and December) in cooperation with geoscientists of the circum-Baltic States. BALTICA is publishing original peer-reviewed papers of international interests on various Earth sciences issues. The particular emphasis is given to Quaternary geology, climate changes and development of ecosystems, palaeogeography, environmental geology, as well as stratigraphy, tectonics, sedimentology and surface processes with relevance to the geological history of the Baltic Sea and land areas. Journal emphasizes modern techniques, methodology and standards. The journal structure comprises original articles, short reviews, information, bibliography.