Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3209304h&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 9, CiteID L09304
Physics
3
Seismology: Earthquake Dynamics (1242), Seismology: Body Waves, Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Tectonophysics: Stresses: Crust And Lithosphere
Scientific paper
A continuous observation of shear wave splitting for 17 years reveals a unique temporal variation in seismic anisotropy in the shallow crust induced by a larger earthquake (MW5.7) beneath the Tokai region, Japan. The delay time between the fast and slow wavelets coseismically increased and then decreased back to the pre-event value. The duration of the decreasing stage is about two years. The decrease may indicate crack healing in the upper 10 km of the crust. We approximate the temporal variation in the delay time as a function of logarithm of time, which is concordant with healing phenomena of cracks reported by laboratory experiments. The observation indicates that healing of cracks in crustal rocks is complete in approximately two years.
Furumoto Muneyoshi
Hiramatsu Yoshihiro
Honma Hiroshi
Ooida Tooru
Saiga Atsushi
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