Physics – Geophysics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3302311i&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 2, CiteID L02311
Physics
Geophysics
22
Marine Geology And Geophysics: Seafloor Morphology, Geology, And Geophysics, Seismology: Earthquake Source Observations (1240), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Tectonophysics: Dynamics And Mechanics Of Faulting (8004), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)
Scientific paper
We have detected anomalous very-low-frequency earthquakes within the accretionary prism along the Nankai Trough, southwestern Japan. Centroid moment tensor inversion analysis reveals that the earthquake hypocenters are distributed at ~10 km depth above the upper surface of the subducting Philippine Sea Plate, and within 50-70 km landward of the trough axis. The focal mechanisms indicate reverse faulting. Their hypocenters are distributed beneath a deformation zone of an accretionary prism in sea-floor topography. These observations suggest that the occurrence of very-low-frequency earthquakes is related to numerous reverse fault systems within the accretionary prism, and that the earthquakes reflect the dynamics of deformation within this accretionary prism.
Ito Yoshihiro
Obara Kazushige
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