Preliminary Tsunami Simulation of the M 7.9 – 280km SE of Kodiak, Alaska

We have simulated the tsunami generated from the M 7.9 – 280km SE of Kodiak, Alaska (56.058°N, 149.097°W, depth=25.0 km, M = 7.9 at 09:31:42 UTC according to USGS) on January 23, 2018. The assumed tsunami sources cover the aftershock area during 2 hours after the mainshock (Fig. 1). The fault sizes and average slips are 100 km × 40 km and 7.4 m, respectively, for both cases. The focal mechanism is strike=257º, dip=65º, and slip=13º for the Case 1, and strike=162º, dip=78º, and slip=154º for the Case 2 from the USGS’s W-phase moment tensor solution. The top depth of the fault was assumed to 15 km. The seismic moment is 9.452 x 1020Nm (Mw = 7.9) assuming the rigidity of 5 x 1010N/m2. (see report)

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