Preliminary Tsunami Simulation of the M 7.5 – 78 km N of Palu, Indonesia

We have simulated the tsunami generated from the M 7.5 – 78km N of Palu, Indonesia (0.178°S, 119.840°E, depth=10.0 km, M = 7.5 at 10:02:43 UTC according to USGS) on September 28, 2018. The assumed tsunami sources cover the aftershock area for 2 hours after the mainshock (Fig. 1). The fault size and average slip are 120 km × 20 km and 3.1 m. The focal mechanism is strike=350º, dip=67º, and slip=-17º from the USGS’s W-phase moment tensor solution. The top depth of the fault was assumed to 5 km. The seismic moment is 2.497 x 1020Nm (Mw = 7.5) assuming the rigidity of 5 x 1010N/m2. (see report)

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