Journal
EARTH PLANETS AND SPACE
Volume 60, Issue 8, Pages 871-875Publisher
SPRINGER HEIDELBERG
DOI: 10.1186/BF03352839
Keywords
very-low frequency earthquake; array signal processing; subduction; Tokachi-oki
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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 seisrnogenic region of ordinary earthquakes and/or in a deformed area of the overriding plate along the subduction zone without accretion.
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