Abstract

The article presents the results of a comprehensive study of seismotectonic, geological-geophysical, geodynamic, and seismological data in the region of the Salsk earthquake of May 22, 2001, M = 4.7, in the low-seismic region of the junction of the Scythian Plate and the East European Platform are presented. The parameters of this earthquake source associated with a deep tectonic structure identified by the microseismic sounding method (MSM) are estimated based on seismological and macroseismic data. The MSM section through the region of the Salsk earthquake was obtained by a submeridional profile about 65 km long across the strike of the Manych deflection zone. It was established that the hypocenter of the 2001 Salsk earthquake was confined to the Salsk fault zone included in the system of the Manych faults. This fault is expressed in a section in the form of a narrow subvertical strip with low seismic wave velocities traced from the Earth’s surface to a depth of more than 40 km. Immediately in the area of the earthquake below a depth of 10 km, the recognized fault zone has a local expansion at the point of transition through the plane when the sedimentary cover contacts with the Proterozoic basement. The assessment of the hypocentral position and source mechanism solution (a gently dipping thrust of the northern side at an angle of 25°–33°) correlates well here with the depth and inclination of the surface of the Proterozoic basement, the elements of which are also traced in the MSM section.

中文翻译：

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基于新的地球物理数据对2001年萨尔斯克地震区深部构造和构造运动运动学的改进

摘要

文章介绍地震构造，地质，地球物理，地球动力学和地震数据的综合研究于2001年5月22日，的萨利斯克地震区的结果中号= 4.7，显示了Scythian板与东欧平台交界处的低地震区域。根据地震学和宏观地震数据估算与通过微地震测深法（MSM）识别的深部构造结构相关的该震源的参数。穿越萨尔茨克地震地区的MSM断面是通过一条沿Manych偏转带走向约65公里长的半水下剖面获得的。可以确定的是，2001年Salsk地震的震源仅限于Manych断层系统中包括的Salsk断层带。该断层以一条狭窄的亚垂直条带的形式表示，从地表到深度超过40 km的地震波速度较低。在10公里以下的地震区域中，当沉积盖层与元古代基底接触时，识别出的断层带在穿过平面的过渡点处具有局部扩展。震中位置和震源机制解的评估（北侧以25°–33°的角度缓慢下沉的推力）在这里与元古代基底表面的深度和倾斜度密切相关，其中的元素是也可以在MSM部分中找到。