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  1. 防災科研関係論文

Strong-Motions From Damaging Moderate Magnitude (5.9 ? Mw) Earthquakes in Japan Recorded by K-NET and KiK-net

https://nied-repo.bosai.go.jp/records/5762
https://nied-repo.bosai.go.jp/records/5762
735137d4-8d7a-4893-9cc1-64e6f70f1445
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Strong-Motions From Damaging Moderate Magnitude (5.9 ? Mw) Earthquakes in Japan Recorded by K-NET and KiK-net
言語
言語 eng
著者 Yadab P. Dhakal

× Yadab P. Dhakal

en Yadab P. Dhakal

Search repository
抄録
内容記述タイプ Other
内容記述 Strong-motions from 79 moderate magnitude (5.9 ? Mw) earthquakes that caused various degrees of impact on humans and built-environment in Japan between 1996 and 2019, after the start of K-NET and KiK-net, are presented. As such, most of the earthquakes occurred beneath the land, and agencies had reported damages from events as small as Mw 4.1. Together, large peak ground accelerations exceeding 500?cm/s<sup>2</sup> were recorded during 15 earthquakes, reaching approximately 1128?cm/s<sup>2</sup> during one event. Similarly, large peak ground velocities exceeding 30?cm/s were recorded during ten earthquakes, reaching about 76?cm/s to the maximum. Most of the large values aforementioned were recorded within a hypocentral distance of approximately 30?km and on soil site conditions. Intermediate to long-period ground motions are of growing concerns in urban areas located on sedimentary basins with mid-rise and high-rise buildings. The threshold magnitude for the large ground motions at the periods of about 2?5?s is not well understood. In March 2013, the Japan Meteorological Agency introduced four levels of long-period ground motion intensity (LPGMI) based on absolute velocity response spectra (AVRS) between 1.6 and 7.8?s. In the present data set, LPGMI of level 3 (AVRS 50?100?cm/s) and level 4 (AVRS &amp;gt;100?cm/s) were observed each at a single site from shallow-focus earthquakes of Mw 5.8 and 5.9 at distances of approximately 12 and 15?km, respectively. However, the peak response periods were relatively short (1.6?1.8?s). The data showed that LPGM from moderate earthquakes is of lower concern regarding earthquake early warning at distances beyond 200?km. The 2018 Mw 5.5 North Osaka earthquake, despite the moderate magnitude, caused the loss of six human lives and brought significant damage to buildings and lifelines. Comparing the data with the ground motion prediction equations (GMPEs) and other events suggested that the North Osaka earthquake was probably a higher stress drop event. These moderate earthquakes’ observations hinted that the commonly used GMPEs in Japan may not sufficiently grasp these earthquakes' hazards.
言語 en
書誌情報 en : Frontiers in Earth Science

巻 9:618400, 発行日 2021-02-12
出版者
言語 en
出版者 Frontiers Media SA
ISSN
収録物識別子タイプ EISSN
収録物識別子 2296-6463
DOI
関連識別子 10.3389/feart.2021.618400
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