Contiguous rupture areas of two Nankai Trough earthquakes revealed by high-resolution tsunami waveform inversion

Details Contiguous rupture areas of two Nankai Trough earthquakes revealed by high-resolution tsunami waveform inversion Contiguous rupture areas of two Nankai Trough earthquakes revealed by high-resolution tsunami waveform inversion

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3208305b&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 8, CiteID L08305

Physics

14

Oceanography: Physical: Tsunamis And Storm Surges, Seismology: Earthquake Dynamics (1242), Seismology: Subduction Zones (1207, 1219, 1240)

Scientific paper

We have developed a new method for inverting tsunami waveforms that reveals considerable detail in megathrust slip during subduction zone earthquakes. Previous methods have ensured compliance with the shallow-water theory used to compute tsunami waveforms by using large subfaults that generate only long-wavelength seafloor deformation. We show that a better approach is to use small subfaults coupled with a smoothing criterion that ensures compliance with the shallow-water approximation. In an application of the method to historical earthquakes in the Nankai Trough, southwestern Japan, we find that the areas with slip > 1 m for the earthquakes of 1944 and 1946, which ruptured adjacent segments of the subduction zone, are separated by a sharp, non-overlapping boundary. This establishes that interseismic accumulation of strain energy extends very close to the boundary between rupture zones, and strongly suggests that this boundary is associated with a physical barrier to rupture.

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