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[1]ZHOU Ying,WANG Hongwei,WEN Ruizhi.Study of Attenuation Characteristics of the Complex Tectonic Region Based on Generalized Inversion Method[J].Journal of Seismological Research,2021,44(04):650-655.

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Study of Attenuation Characteristics of the Complex Tectonic Region Based on Generalized Inversion Method

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 04 Page number: 650-655 Column: Public date: 2021-11-10

Title:: Study of Attenuation Characteristics of the Complex Tectonic Region Based on Generalized Inversion Method

Author(s):: ZHOU Ying¹; 2; WANG Hongwei¹; 2; WEN Ruizhi¹; 2; (1.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China;2.Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration,Harbin 150080,Heilongjiang,China)

Keywords:: Generalized Spectral Inversion method; the Kanto basin; strong ground motion; attenuation characteristics; quality factor

CLC:: P315.914

DOI:: -

Abstract:: In order to study the characteristics of the ground motion attenuation of the complex plate tectonics of the Kanto basin and its vicinity in Japan,on the basis of the focal mechanism and Slab1.0 model,and according to the earthquake classification scheme adapted for Japan proposed by previous studies,we decided the categories of the earthquake events,and on this basis we further divided the study region into three parts.Then we used the method of One-step Nonparametric Generalized Spectrum Inversion to analyze the attenuation characteristics of ground vibrations in the three regions.The results show that in Region 1,the path attenuation of the ground motion of the shallow-crust earthquakes occurring inland is weak; there is almost no attenuation in long distance.The frequency-dependent inelastic attenuation is also weak.The quality factor Q=92.33f ^1.87.In Region 2,the decay rate of the path attenuation of the upper-mantle earthquake inland increases with the increase of distance.The frequency-dependent inelastic attenuation is stronger.The quality factor Q=27.75f^1.08.In Region 3,the path attenuation of the ground motion of the shallow-crust and upper-mantle earthquakes in the offshore area has the same attributes of the path attenuation in the first two regions.The quality factor Q=58.07f ^0.89.

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Last Update: 2021-11-10