2021年3月11日
Extracting near-field seismograms from ocean-bottom pressure gauge inside the focal area: application to the 2011 Mw 9.1 Tohoku-Oki earthquake
Geophysical Research Letters
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- 巻
- 48
- 号
- 7
- 開始ページ
- e2020GL091664
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1029/2020GL091664, 10.1002/essoar.10504939.1
- 出版者・発行元
- American Geophysical Union
Recent studies have shown that ocean‐bottom pressure gauges (OBPs) can record seismic waves in addition to tsunamis and seafloor permanent displacements, even if they are installed inside the focal area where the signals are extremely large. We developed a method to extract dynamic ground motion waveforms from near‐field OBP data consisting of a complex mixture of various signals, based on an inversion analysis along with a theory of tsunami generation. We applied this method to the OBP data of the 2011 Tohoku‐Oki earthquake. We successfully extracted the low‐frequency vertical seismograms inside the focal area (f < ∼0.05 Hz), although those of the Mw ∼9 megathrust earthquake had never previously been reported. The seismograms suggested two dominant energy releases around the hypocenter. The seismic wave signals recorded by the near‐field OBP will be important not only to reveal earthquake ruptures and tsunami generation processes but also to conduct real‐time tsunami forecasts.
- リンク情報
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- DOI
- https://doi.org/10.1029/2020GL091664 本文へのリンクあり
- DOI
- https://doi.org/10.1002/essoar.10504939.1
- 共同研究・競争的資金等の研究課題
- 沖合津波観測による津波即時予測技術の共進化を可能にする標準評価法の創出
- 共同研究・競争的資金等の研究課題
- 海底動圧変動記録を用いた東北沖地震活動の時空間推移
- URL
- https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL091664 本文へのリンクあり
- ID情報
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- DOI : 10.1029/2020GL091664
- DOI : 10.1002/essoar.10504939.1
- ISSN : 0094-8276
- eISSN : 1944-8007