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Preliminary estimation of high-frequency (4-20 Hz) energy released from the 2016 Kumamoto, Japan, earthquake sequence
https://nied-repo.bosai.go.jp/records/5057
https://nied-repo.bosai.go.jp/records/5057c2affa67-9ef8-449a-8a4c-a690c0d1e2eb
Item type | researchmap(1) | |||||||||||
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公開日 | 2023-03-30 | |||||||||||
タイトル | ||||||||||||
言語 | en | |||||||||||
タイトル | Preliminary estimation of high-frequency (4-20 Hz) energy released from the 2016 Kumamoto, Japan, earthquake sequence | |||||||||||
言語 | ||||||||||||
言語 | eng | |||||||||||
著者 |
Kaoru Sawazaki
× Kaoru Sawazaki
× Hisashi Nakahara
× Katsuhiko Shiomi
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抄録 | ||||||||||||
内容記述タイプ | Other | |||||||||||
内容記述 | We estimate high-frequency (4-20 Hz) energy release due to the 2016 Kumamoto, Japan, earthquake sequence, within a time period from April 14 to 26 through envelope inversion analysis applied to the Hi-net continuous seismograms. We especially focus on energy releases after each of the April 14 M(JMA)6.5 and the April 16 M(JMA)7.3 earthquakes. The cumulative energy release from aftershocks of the April 14 event reaches 60% of that from the April 14 event itself by the lapse time of 27 h (pre-April 16 period). On the other hand, the cumulative energy release from aftershocks of the April 16 event reaches only 11 and 13% of that from the April 16 event itself by the lapse times of 27 h and 10 days (post-April 16 period), respectively. This discrepancy in the normalized cumulative energy release (NCER) indicates that the April 14 event was followed by much larger relative aftershock productivity than the April 16 event. Thus, NCER would provide information that reflects relative aftershock productivity and ongoing seismicity pattern after a large earthquake. We also find that the temporal decay of the energy release rate obeys the power law. The exponent p(E) of the power-law decay is estimated to be 1.7-2.1, which is much larger than the typical p value of the Omori-Utsu law: slightly larger than 1. We propose a simple relationship given by p(E) = beta p/b, where p value, b value of the Gutenberg-Richter law, and beta value of the magnitude-energy release relationship are combined. | |||||||||||
言語 | en | |||||||||||
書誌情報 |
en : EARTH PLANETS AND SPACE 巻 68 |
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出版者 | ||||||||||||
言語 | en | |||||||||||
出版者 | SPRINGEROPEN | |||||||||||
ISSN | ||||||||||||
収録物識別子タイプ | ISSN | |||||||||||
収録物識別子 | 1880-5981 | |||||||||||
DOI | ||||||||||||
関連識別子 | 10.1186/s40623-016-0557-3 |