Abstract
A short-term slow slip event (SSE) synchronizing with an activity of low frequency earthquakes occurred beneath Aichi prefecture on July 20-22, 2005. Characteristic strain changes caused by the short-term SSE were recorded by the strainmeters of Japan Meteorological Agency. We examined the strain data of the Tokai area in detail since July 1984. As a result, eleven strain changes were detected in about fifteen years from July 1984 to August 1999, during which only the data of volumetric strainmeters were available. Twenty strain changes were detected in six years from September 1999 to August 2005, during which the data of multi-component strainmeters and information of low frequency earthquakes were also available. The detected strain changes were classified into three types. The three types correspond to different active areas of low frequency earthquakes. The three patterns of the observed stain changes were explained by assuming rectangular faults in the active areas of low frequency earthquakes. It was found that the short-term SSE occurred more frequently in the periods of 1987-1989 and 2003-2004. These active periods roughly agree with that of the long-term SSE in the Tokai region.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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