Earthquake Source Fault Beneath Tokyo

See allHide authors and affiliations

Science  15 Jul 2005:
Vol. 309, Issue 5733, pp. 462-464
DOI: 10.1126/science.1110489

You are currently viewing the abstract.

View Full Text


Devastating earthquakes occur on a megathrust fault that underlies the Tokyo metropolitan region. We identify this fault with use of deep seismic reflection profiling to be the upper surface of the Philippine Sea plate. The depth to the top of this plate, 4 to 26 kilometers, is much shallower than previous estimates based on the distribution of seismicity. This shallower plate geometry changes the location of maximum finite slip of the 1923 Kanto earthquake and will affect estimations of strong ground motion for seismic hazards analysis within the Tokyo region.

View Full Text