Spatiotemporal distribution of very-low frequency earthquakes in Tokachi-oki near the junction of the Kuril and Japan trenches revealed by using array signal processing
書誌事項
- 公開日
- 2008-08
- 権利情報
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- https://creativecommons.org/licenses/by/4.0/
- https://creativecommons.org/licenses/by/4.0/
- DOI
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- 10.1186/bf03352839
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title> <jats:p>We have developed a signal-processing method for array data recorded at densely and widely distributed tiltmeter stations in Japan and analyzed the data recorded during the last 5 years. Filtered seismograms were analyzed to detect coherent seismic waves and estimate the epicenters. In order to identify very-low frequency earthquakes (VLFEs) with only low-frequency energies only, we selected only events not listed in the earthquake catalogue provided by the Japan Meteorological Agency from all of the detected events. The epicenters of the obtained VLFEs were estimated to be distributed not only along the Nankai Trough, where the events occurred on the reverse faults in the well-developed accretionary prism, but also in Tokachi-oki without accretion. This result suggests that even in such a region, VLFEs can occur on a shallower portion of the plate boundary than the seismogenic region of ordinary earthquakes and/or in a deformed area of the overriding plate along the subduction zone without accretion.</jats:p>
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 60 (8), 871-875, 2008-08
Springer Science and Business Media LLC