フルテキストファイル
著者
香川 敬生 Faculty of Engineering, Tottori University 研究者総覧 KAKEN
キーワード
real-time monitoring
seismic intensity network
PLUM method
attenuation
Tottori Prefecture
抄録
An application of the PLUM (Propagation of Local Undamped Motion) method to real-time seismic intensity distribution from a dense seismic intensity network maintained by a local government in Japan is demonstrated. The JMA (Japan Meteorological Agency) has employed the PLUM method from March 2018 as a supplement to the traditional EEW (Earthquake Early Warning) which requires hypocenter determination. A dense observation network is desirable for upgrading accuracy and immediateness of EEW including the PLUM method. Seismic intensity meters in Tottori Prefecture, Japan, are suitable for the purpose because they have been improved to broadcast packets with peak ground acceleration and JMA seismic intensity at every 1 s. Also, 34 seismic intensity meters are installed in the target area while only six observation sites are used for the EEW by the JMA. The packet data are received at Tottori University, and the modified PLUM method considers wave propagation with damping from not only the observation points but also all evaluating grid points at a 1 km mesh. Additionally, P-wave amplitudes in preliminary tremors are also introduced to estimate seismic intensities from an empirical relationship. Applying the methodology to past earthquake data, more detailed and rapid evaluations of seismic intensity distribution are achieved. We expect the system will be utilized for earthquake disaster mitigation measures of local governments.
出版者
Frontiers Media
資料タイプ
学術雑誌論文
外部リンク
EISSN
22966463
掲載誌名
FRONTIERS IN EARTH SCIENCE
9
発行日
2021-08-20
出版者DOI
著者版フラグ
出版社版
著作権表記
(C) 2021 Kagawa. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
掲載情報
Kagawa Takao. Application of the Modified PLUM Method to a Dense Seismic Intensity Network of a Local Government in Japan: A Case Study on Tottori Prefecture. FRONTIERS IN EARTH SCIENCE. 2021. 9. doi:10.3389/feart.2021.672613
部局名
工学部・工学研究科
言語
英語
Web of Science Key ut
WOS:000696576300001