Extracting Near-Field Seismograms From Ocean-Bottom Pressure Gauge Inside the Focal Area: Application to the 2011 Mw 9.1 Tohoku-Oki Earthquake

T. Kubota; T. Saito; H. Tsushima

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Extracting Near-Field Seismograms From Ocean-Bottom Pressure Gauge Inside the Focal Area: Application to the 2011 Mw 9.1 Tohoku-Oki Earthquake

机译：从焦点区域内的海底压力表中提取近场地震图：应用于2011 MW 9.1 Tohoku-Oki地震

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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.

机译：最近的研究表明，除了海啸和海底永久性位移之外，海底压力表（OBP）还可以记录地震波，即使它们安装在信号极大的焦点区域内。我们开发了一种方法来提取由近场OBP数据提取动态地面运动波形，其基于倒置分析以及海啸生成理论的反演分析。我们将这种方法应用于2011年Tohoku-oki地震的OBP数据。我们成功地提取了焦点区域内的低频垂直地震图（F <〜0.05 Hz），尽管从未报道过MW〜9 Megathrust地震的地震。地震图建议围绕斜视的两个主导能源释放。近场OBP记录的地震波信号不仅是揭示地震破裂和海啸生成过程的重要性，而且还是进行实时海啸预测。

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《Oceanographic Literature Review》 |2021年第6期|1282-1282|共1页
作者
T. Kubota; T. Saito; H. Tsushima;
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National Research Institute for Earth Science and Disaster Resilience Tsukuba Japan;

National Research Institute for Earth Science and Disaster Resilience Tsukuba Japan;

National Research Institute for Earth Science and Disaster Resilience Tsukuba Japan;

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1. A review of the rupture characteristics of the 2011 Tohoku-oki Mw 9.1 earthquake [J] . Lay Thorne Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth . 2018,第期

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2. Anomalous signals before 2011 Tohoku-oki Mw9.1 earthquake, detected by superconducting gravimeters and broadband seismometers [J] . Gu Xiang, Jiang Tianxing, Zhang Wenqiang, 大地测量与地球动力学（英文版） . 2014,第002期

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3. Tidal triggering of earthquakes prior to the 2011 Tohoku-Oki earthquake (M _w 9.1) [J] . Tanaka S. Geophysical Research Letters . 2012,第7期

机译：在2011年东北冲木地震之前触发潮汐地震（M _w 9.1）
4. Integration of GNSS and Seismic Data for Earthquake Early Warning: A Case Study on the 2011 Mw 9.0 Tohoku-Oki Earthquake [C] . Bofeng Guo, Xiaohong Zhang, Xingxing Li China satellite navigation conference . 2014

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5. Fault stress inversion reveals seismogenic asperity of the 2011 Mw 9.0 Tohoku-Oki earthquake [O] . Zhoumin Xie, Yongen Cai, Chi-yuen Wang, -1

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6. Quasi real-time fault model estimation for near-field tsunami forecasting based on RTK-GPS analysis: Application to the 2011 Tohoku-Oki earthquake (Mw9.0) [O] . Yusaku Ohta, Tatsuya Kobayashi, Hiroaki Tsushima, 2012

机译：基于RTK-GPS分析的近场海啸预测准实时故障模型估计：2011年Tohoku-OKI地震的应用（MW9.0）

Extracting Near-Field Seismograms From Ocean-Bottom Pressure Gauge Inside the Focal Area: Application to the 2011 Mw 9.1 Tohoku-Oki Earthquake

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