Equivalent Point‐Source Ground‐Motion Model for Subduction Earthquakes in Japan,Bulletin of the Seismological Society of America

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Equivalent Point‐Source Ground‐Motion Model for Subduction Earthquakes in Japan
Bulletin of the Seismological Society of America ( IF 2.6 ) Pub Date : 2021-04-01 , DOI: 10.1785/0120200257
Behzad Hassani ₁ , Gail Marie Atkinson ₂

Affiliation

We use an equivalent point‐source ground‐motion model (GMM) to characterize subduction earthquakes (interface and in‐slab) in Japan. The model, which is calibrated using the newly published Next Generation Attenuation (NGA) Subduction database (Bozorgnia et al., 2020), provides a useful complement to the more traditional empirical NGA models developed from the same database. The utility of the point‐source model approach lies in its ability to aid in the interpretation of observed trends in the data and to guide modifications to the GMM for application to other regions having fewer data. Key trends in the data that are parameterized with the model include: (a) the enrichment of high‐frequency amplitudes for in‐slab versus interface events, as modeled by a depth‐dependent stress parameter, and (b) attenuation attributes that vary with event type and region, including consideration of fore‐arc versus back‐arc settings. The developed GMMs of this study are applicable for M 4.5–9.2 for interface events, and M 4–8.5 for in‐slab earthquakes, for rupture distances (⁠Drup⁠) from 10 to 600 km, and for 100 m/s

中文翻译：

日本俯冲地震的等效点源地震动模型

我们使用等效的点源地震动模型（GMM）来描述日本的俯冲地震（界面地震和板内地震）。该模型使用新发布的下一代衰减（NGA）俯冲数据库进行了校准（Bozorgnia等，2020），为从同一数据库开发的更为传统的经验NGA模型提供了有用的补充。点源模型方法的实用性在于它能够帮助解释所观察到的数据趋势，并指导对GMM进行修改，以应用于数据量较少的其他区域。用模型参数化的数据的主要趋势包括：（a）根据与深度有关的应力参数建模，针对板内和界面事件的高频振幅的富集，（b）衰减属性随事件类型和区域而变化，包括考虑弧前设置与弧后设置。这项研究开发的GMM适用于界面事件的M 4.5–9.2，板内地震的M 4–8.5，破裂距离（⁠Drup⁠）从10到600 km，以及100 m / s

更新日期：2021-03-24

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