Three-dimensional velocity structure in the Bungo Channel and Shikoku area, Japan, and its relationship to low-frequency earthquakes

Details Three-dimensional velocity structure in the Bungo Channel and Shikoku area, Japan, and its relationship to low-frequency earthquakes Three-dimensional velocity structure in the Bungo Channel and Shikoku area, Japan, and its relationship to low-frequency earthquakes

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3324307n&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 24, CiteID L24307

Physics

2

Seismology: Body Waves, Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Subduction Zones (1207, 1219, 1240), Seismology: Tomography (6982, 8180), Tectonophysics: Dynamics: Seismotectonics

Scientific paper

We used a tomographic inversion to determine P and S wave structures in the western Shikoku and Bungo Channel region, for comparison with the locations of low-frequency earthquakes. The velocity model clearly images the high velocity subducting slab and we can see the spatial relation to the low-frequency earthquakes. Under western Shikoku the low-frequency earthquakes occur at depths close to the plate interface, but under the adjacent Bungo Channel region to the west, there is a clear depth separation. Our interpretation is that the low-frequency events are occurring in a region of high Vp/Vs that is located above the subducting slab. The depth separation above the plate seems to vary depending on the region.

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