Geoinformatics Unit

Preliminary Tsunami Height Mapping Following the M7.5 Earthquake in Indonesia on September 28, 2018

September 29, 2018

On September 28, 2018 (10:02:43 UTC), an M7.5 (USGS) earthquake occurred 8km North of Palu, Indonesia, causing a tsunami with waves up to 2 m (BBC News). The Geoinformatics Unit from RIKEN Center for Advanced Intelligence Project carried out a preliminary numerical simulation of the tsunami.

We assumed a rectangular fault of 120 km x 20 km area with a slip of 3.2 m. The focal mechanism is strike=350º, dip=67º, and slip=-17º from the USGS’s W-phase moment tensor solution. The numerical model is based on the linear shallow-water equations using 12 arc-second bathymetry data (GEBCO). The figure below shows the maximum tsunami height (the blue star indicates the epicenter).

img12

The maximum tsunami height (the blue star indicates the epicenter).