Mapping Heterogeneities of the Short-Period S-Wave Attenuation Field in the Lithosphere of Southwest Alaska

IF 0.3 Q4 GEOCHEMISTRY & GEOPHYSICS

Seismic Instruments Pub Date : 2023-03-20 DOI:10.3103/S0747923922070064

Yu. F. Kopnichev, I. N. Sokolova

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Abstract

The authors have studied the characteristics of the short-period S-wave attenuation field in the lithosphere of southwest Alaska (in the Alaska subduction zone). Records of seismic station KDAK, obtained for shallow earthquakes within the distance range of ~250–750 km, were processed. We used a method that analyzes the ratio of maximum amplitudes in Sn and Pn waves (parameter Sn/Pn). The correlation dependence of this parameter on distance for wave lines crossing rupture zones of three large and great earthquakes is plotted: the Great Alaskan earthquake of March 28, 1964 (M_W = 9.2), the Simeonov earthquake of July 22, 2020 (M_W = 7.8), and Chignik earthquake of July 29, 2021 (M_W = 8.2). It was established that this dependence goes a little higher than similar dependences obtained earlier for regions of southwest Japan and central Chile, and much higher than for the region of northeast Japan. The reasons for the substantial differences of these dependences in different regions are discussed. The authors consider heterogeneities of the attenuation field in the rupture zones of the Simeonov earthquake and its largest aftershock (M_W = 7.6), as well as of the Chignik earthquake.

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阿拉斯加西南部岩石圈短周期s波衰减场的非均质性填图

本文研究了阿拉斯加西南部(阿拉斯加俯冲带)岩石圈短周期s波衰减场的特征。对KDAK台站在~250 ~ 750 km范围内的浅层地震记录进行了处理。我们使用了一种分析Sn波和Pn波最大振幅之比的方法(参数Sn/Pn)。绘制了三次大地震(1964年3月28日阿拉斯加大地震(MW = 9.2)、2020年7月22日Simeonov地震(MW = 7.8)和2021年7月29日Chignik地震(MW = 8.2))中该参数与穿越破裂带的波线距离的相关关系。研究发现，这种依赖程度略高于之前日本西南部和智利中部地区的类似依赖程度，而远高于日本东北部地区。讨论了这些依赖在不同地区存在重大差异的原因。作者考虑了Simeonov地震及其最大余震(MW = 7.6)和Chignik地震破裂带衰减场的非均质性。

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来源期刊

Seismic Instruments GEOCHEMISTRY & GEOPHYSICS-

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期刊介绍： Seismic Instruments is a journal devoted to the description of geophysical instruments used in seismic research. In addition to covering the actual instruments for registering seismic waves, substantial room is devoted to solving instrumental-methodological problems of geophysical monitoring, applying various methods that are used to search for earthquake precursors, to studying earthquake nucleation processes and to monitoring natural and technogenous processes. The description of the construction, working elements, and technical characteristics of the instruments, as well as some results of implementation of the instruments and interpretation of the results are given. Attention is paid to seismic monitoring data and earthquake catalog quality Analysis.