Initiation of the great Mw 9.0 Tohoku-Oki earthquake

Details Initiation of the great Mw 9.0 Tohoku-Oki earthquake Initiation of the great Mw 9.0 Tohoku-Oki earthquake

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.308..277c&link_type=abstract

Earth and Planetary Science Letters, Volume 308, Issue 3, p. 277-283.

Computer Science

2

The 2011 Tohoku–Oki Earthquake, Earthquake Source Parameters, Earthquake Initiation

Scientific paper

We determined the location, size, mechanism, and the frequency content of the first 4.0 s of the 2011 Tohoku-Oki earthquake. Since the beginning of this earthquake is very small, we develop a comparative approach against a near-by reference earthquake, the master event. We first determined the water depth near the master event using the differential timing between the water phase pwP reflected from the air-water interface and the depth phase pP reflected from the water-crust interface. Then we located the master event using the well-known ocean bathymetry in the area. After calibrating teleseismic arrays (Δ = 30° to 90°) at short periods for timing and amplitude with respect to the master event, we were able to determine the initiation of the main event. It began as a small (Mw = 4.9) thrust event located at 38.19°N, 142.68°E at a depth of 21 km, and, a few seconds later, evolved into a slower extremely large slip event up-dip.

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