Abstract

This paper presents the results of a seismic hazard assessment for the Magadan region (quadrangle 58.5°–66.0° N, 143.3°–157.7° E) in terms of macroseismic scale units. The extent of the research corresponds to the regional one (in the terminology framework accepted in Russia, this corresponds to the scale of the detailed seismic zoning (DSZ)). The seismic activity matrix (A_3.3) is obtained and the following main seismicity parameters are estimated: the slope of the recurrence graph, the average thickness of the seismoactive layer, and depth of this layer (h); on the basis of the obtained results, when constructing seismic intensity maps, the focal depth we used was h = 10 km. Proceeding from the analysis of comprehensive seismological, tectonic, and geological data, 13 zones of possible earthquake sources (PES zones) with M_max = 6.5, 7.0 and 7.5 were distinguished in the Magadan region . Beyond the identified zones, the background seismicity was assumed to be M_max = 5.0. The study resulted in obtaining probabilistic seismic hazard maps of the Magadan region in terms of macroseismic scale intensity units, calculated for average recurrence periods of 500, 1000, and 5000 years.

中文翻译：

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在接近详细地震区划的尺度上对马加丹地区的地震活动和地震危险性评估

摘要

本文以宏观地震标度单位为单位，对马加丹地区（四边形为58.5°–66.0°N，143.3°–157.7°E）的地震危害进行了评估。研究的范围与区域性研究相对应（在俄罗斯公认的术语框架中，这与详细地震带（DSZ）的规模相对应）。得到地震活动矩阵（A _3.3），并估计以下主要地震活动参数：递归图的斜率，地震活动层的平均厚度和该层的深度（h）；根据获得的结果，在构造地震烈度图时，我们使用的焦深为h= 10公里。通过对地震，构造和地质数据的综合分析，在马加丹地区区分出13个可能的震源区（PES区），M _max = 6.5、7.0和7.5。在确定的区域之外，假定背景地震活动度为M _max = 5.0。该研究得出了以宏观地震规模强度单位为单位的马加丹地区概率地震灾害图，计算得出的平均复发周期为500年，1000年和5000年。