Basin effect quantitation of four deep basins in Japan to explain the gap between empirical and numerical basin‐depth effect models

Zhinan Xie; Wanjun Ma

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Basin effect quantitation of four deep basins in Japan to explain the gap between empirical and numerical basin‐depth effect models

机译：Basin effect quantitation of four deep basins in Japan to explain the gap between empirical and numerical basin‐depth effect models

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Abstract To incorporate basin effects into seismic hazard assessment of urban areas and infrastructure, basin‐depth effect models that are the dependence of basin amplification factor on basin depth have been derived via numerical and empirical approaches. However, commonly observed quantitative and qualitative differences between numerical and empirical models remain unresolved. In particular, empirical models tend to predict smaller basin amplification factors. In this study, a modified empirical approach from Choi et?al. was applied to the derivation of basin‐depth effect models for four deep basins in Japan using a database consisting of 71 MJ?>?6 (Mw?>?5.7) earthquakes and 13,562 records from strong‐motion seismograph networks (K‐NET and KiK‐net). The obtained basin‐depth models vary among basins and crustal‐subduction earthquake pairs, which confirms the recent trend of accounting for regional‐seismotectonic basin amplification in seismic hazard analysis. The basin amplification observed for crustal earthquakes is generally larger than that for subduction earthquakes. Moreover, the differences between the numerical and empirical models can be explained by changing the options of basin or outside‐basin stations for computing the inter‐event residuals. These results bridge a knowledge gap in seismic hazard analysis between ground‐motion prediction equations and those using large‐scale seismic wave simulations, which are now the main tools for regions lacking seismic records.

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来源
《Earthquake engineering & structural dynamics》 |2022年第13期|3047-3068|共22页
作者
Zhinan Xie; Wanjun Ma;
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作者单位

Ministry of Emergency Management;

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正文语种英语
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basin‐depth effect models; crustal‐subduction earthquake pairs; deep sedimentary basin; empirical residual analysis; regional‐seismotectonic basin amplification; seismic hazard analyses;

Basin effect quantitation of four deep basins in Japan to explain the gap between empirical and numerical basin‐depth effect models

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