2018-2019 年拜卡尔地区和 TRANSBAIKALIA 的地震烈度

V. Melnikova, N. Gileva, Y. Radziminovich, A. Filippova, E. Kobeleva
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引用次数: 0

摘要

我们考虑了 2018-2019 年贝加尔地区和外贝加尔地区的地震过程特征。在此期间,共记录了 14545 次 КR≥5.6 的地震。94%以上的地震事件发生在贝加尔裂谷地带。其中,相对较强的地震发生在 Khubsugul-Tunka 地区(2019 年 3 月 29 日,Mw=4.8)和贝加尔裂谷东北翼与 Olekma-Stanovoy 造山系统交界地带(2019 年 9 月 28 日,Mw=5.1)。49 次地震造成了有感宏观地震效应,在该地区的居民点最常表现为 3-4 级和 4 级地震烈度。少数情况下烈度为 5-6 级。确定了 КR≥9.1 的 81 次地震的震源参数。其中大部分发生在次水平延伸的地震构造体系中。根据 P 波初动极性确定了 61 个震源机制。利用 P 波初动极值和面波振幅谱联合反演估算了 13 次地震的震源参数。总体而言,2018-2019 年的地震活动处于中等水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SEISMICITY of the BAIKAL REGION and TRANSBAIKALIA in 2018–2019
We considered a character of the seismic process in the Baikal region and Transbaikalia in 2018–2019. During this time period, 14545 earthquakes with КR≥5.6 were registered. More than 94 % of the seismic events were localized in the Baikal rift zone. Within it, relatively strong earthquakes occurred in Khubsugul-Tunka area (March 29, 2019, Mw=4.8) and in the junction zone of the northeastern flank of the Baikal rift and the Olekma-Stanovoy orogenic system (September 28, 2019, Mw=5.1). 49 earthquakes caused felt macroseismic effects which most often manifested themselves in the settlements of the region with intensity of 3–4 and 4. Intensity of 5–6 was observed in few cases. Earthquake source parameters were determined for 81 seismic events with КR≥9.1. Most of them occurred in the seismotectonic regime of subhorizontal extension. 61 focal mechanisms were determined from P-wave first-motion polarities. Source parameters for 13 earthquakes were estimated using a joint inversion of P-wave first-motion polarities and surface wave amplitude spectra. In general, 2018–2019 are characterized by a moderate level of seismic activity.
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