Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1699i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 16, p. 1699-1702.
Physics
1
Earth Crust, Ray Tracing, S Waves, Seismology, Volcanoes, Wave Reflection, Earthquakes, Japan, Strain Distribution
Scientific paper
The Beppu-Shimabara graben, in Kyushu, Japan, has active seismic regions and active volcanoes. Studies using triangulation, gravity surveys and mechanism solutions of large earthquakes show that the graben is in a state of extensive stress associated with rifting. A temporary seismic study was carried out from February 20 to March 8 in 1992 in the region, during which time many seismic signals were observed. The microearthquake seismograms recorded inside the graben have a later phase dominant on the horizontal component following the direct S-wave. Two-dimensional ray-tracing was applied to investigate the cause of the later phase. The phase was identified as an S-reflected S phase (SxS-phase) from a discontinuity with a depth of 20 km. The reflection points are located inside the Beppu-Shimabara graben that is in a state of extensive stress associated with rifting.
Iidaka Takashi
Ikami Akira
Miura Katsumi
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