Abstract

The paper considers one of the perceptible earthquakes that occurred on March 29, 2019, in the western part of the Tunka rift basin system. The epicenter of this seismic event was localized within the Hoytogol basin. The earthquake source parameters were as follows: hypocentral depth (h = 36–37 km), scalar seismic moment (M₀ = 1.6 × 10¹⁶ N m), moment magnitude (M_w = 4.8), and focal mechanism—were determined using joint inversion of surface wave amplitude spectra and polarities of P-wave first arrivals. The focal mechanism demonstrates the predominance of combined thrust and strike-slip movements, indicating uplifting tectonic movements in the Hoytogol basin. The shaking from the earthquake was felt within a vast area, with an intensity of up to I = III at epicentral distances up to 490 km. Macroseismic data were obtained using different methods, including an interactive questionnaire hosted on the website of the Baikal Branch of GS RAS. Analysis of the macroseismic data made it possible to formulate the goal of refining the regional macroseismic field equation.

中文翻译：

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2019年3月29日在通卡大裂谷盆地系统西部发生的地震：震源参数和宏观地震效应

摘要

本文考虑了2019年3月29日在通卡裂谷盆地系统西部发生的可感知地震之一。该地震事件的震中位于Hoytogol盆地内。震源参数如下：震源深（h  = 36–37 km），标量地震矩（M ₀  = 1.6×10 ¹⁶  N m），矩震级（M _w  = 4.8）和震源机制—使用面波振幅谱和P的极性的联合反演-wave先到。震源机制表明了推力和走滑运动相结合的优势，表明在Hoytogol盆地构造运动抬升。在广阔的区域中感觉到了地震的震动，在震中距离达490 km时强度高达I = III。大地震数据是通过不同方法获得的，包括在GS RAS贝加尔湖分公司网站上托管的交互式调查表。通过对大地震数据的分析，可以制定出完善区域大地震场方程的目标。