Delineation of probable asperities on the Atotsugawa fault, central Japan, using a dense temporary seismic network

Details Delineation of probable asperities on the Atotsugawa fault, central Japan, using a dense temporary seismic network Delineation of probable asperities on the Atotsugawa fault, central Japan, using a dense temporary seismic network

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409318k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 9, CiteID L09318

Physics

2

Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Tomography (6982, 8180), Structural Geology: Local Crustal Structure, Structural Geology: Role Of Fluids, Tectonophysics: Dynamics And Mechanics Of Faulting (8004)

Scientific paper

We elucidate the velocity structure along the Atotsugawa fault by inverting arrival times from local earthquakes and explosive sources using double-difference tomography. High P-wave (V p) and S-wave (V s) velocity bodies are located in the western and eastern sections with depths greater than 2 km. Most earthquake hypocenters are distributed at the periphery of the high-velocity bodies. At the western section, high-V p body extends for 20 km along fault strike and 10 km perpendicular to strike. We suggest that the high-velocity body imaged at the western section is an asperity that ruptured in the 1858 Hietsu Earthquake. In contrast, the central section of the Atotsugawa fault is characterized by low-V p and low-V p/V s values. The extremely low seismicity and the creep-like movements observed at the central section are attributed to this local crustal heterogeneity associated with crustal fluids.

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