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Testing the Depths to 1.0 and 2.5 km/s Velocity Isosurfaces in a Velocity Model for Japan and Implications for Ground-Motion Modeling

  • In the Next Generation Attenuation West2 (NGA-West2) project, a 3D subsurface structure model (Japan Seismic Hazard Information Station [J-SHIS]) was queried to establish depths to 1.0 and 2.5 km/s velocity isosurfaces for sites without depth measurement in Japan. In this article, we evaluate the depth parameters in the J-SHIS velocity model by comparing them with their corresponding site-specific depth measurements derived from selected KiK-net velocity profiles. The comparison indicates that the J-SHIS model underestimates site depths at shallow sites and overestimates depths at deep sites. Similar issues were also identified in the southern California basin model. Our results also show that these underestimations and over-estimations have a potentially significant impact on ground-motion prediction using NGA-West2 ground-motion models (GMMs). Site resonant period may be considered as an alternative to depth parameter in the site term of a GMM.

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Author:Chuanbin ZhuORCiD, Fabrice CottonORCiDGND, Marco PilzORCiD
Parent Title (English):Bulletin of the Seismological Society of America
Publisher:Seismological Society of America
Place of publication:Albany
Document Type:Article
Year of first Publication:2019
Year of Completion:2019
Release Date:2020/09/28
First Page:2710
Last Page:2721
Funder:Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe (SERA) project - EU Horizon 2020 Programme [730900]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Peer Review:Referiert