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Ambient seafloor noise excited by earthquakes in the Nankai subduction zone
https://nied-repo.bosai.go.jp/records/4619
https://nied-repo.bosai.go.jp/records/4619dd2b0bce-fd5a-4892-9a51-34802efb9845
| 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 | Ambient seafloor noise excited by earthquakes in the Nankai subduction zone | |||||||||||||||||
| 言語 | ||||||||||||||||||
| 言語 | eng | |||||||||||||||||
| 著者 |
Takashi Tonegawa
× Takashi Tonegawa
× Yoshio Fukao
× Tsutomu Takahashi
× Koichiro Obana
× Shuichi Kodaira
× Yoshiyuki Kaneda
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| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||
| 内容記述 | Excitations of seismic background noises are mostly related to fluid disturbances in the atmosphere, ocean and the solid Earth. Earthquakes have not been considered as a stationary excitation source because they occur intermittently. Here we report that acoustic-coupled Rayleigh waves (at 0.7-2.0 Hz) travelling in the ocean and marine sediments, retrieved by correlating ambient noise on a hydrophone array deployed through a shallow to deep seafloor (100-4,800 m) across the Nankai Trough, Japan, are incessantly excited by nearby small earthquakes. The observed cross-correlation functions and 2D numerical simulations for wave propagation through a laterally heterogeneous ocean-crust system show that, in a subduction zone, energetic wave sources are located primarily under the seafloor in directions consistent with nearby seismicity, and secondarily in the ocean. Short-period background noise in the ocean-crust system in the Nankai subduction zone is mainly attributed to ocean-acoustic Rayleigh waves of earthquake origin. | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 書誌情報 |
en : NATURE COMMUNICATIONS 巻 6, 発行日 2015-01 |
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| 出版者 | ||||||||||||||||||
| 言語 | en | |||||||||||||||||
| 出版者 | NATURE PUBLISHING GROUP | |||||||||||||||||
| ISSN | ||||||||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||||||||
| 収録物識別子 | 2041-1723 | |||||||||||||||||
| DOI | ||||||||||||||||||
| 関連識別子 | 10.1038/ncomms7132 | |||||||||||||||||
