2008 Nov 16 Sulawesi, Indonesia, Earthquake
November 21, 2008
Strong Motion Seismology Group
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Overall Comments
An earthquake occurred on November 16, 2008 (UT) off the northern coast of
the Minahassa peninsula, Indonesia.
To investigate source process of the earthquakes, we have performed
teleseismic waveform inversion of Kikuchi and Kanamori (1991)
using displacement records observed at stations of FDSN from IRIS DMC.
Since the source region is located in the ocean, we assumed a water
layer of 2 km for the 1D velocity structure around the source.
We fixed the epicenter determined
by USGS and searched the focal depth to minimize the waveform fit.
The residual of the finite fault inversion preferred a low-angle south-dipping
fault plane with a moment magnitude of Mw 7.2. The focal depth was estimated
to be 25 km, and the large slip area was found at the deeper part respect to the hypocenter.
The low-angle south-dipping fault plane is also pointed out by the
USGS earthquake summary poster.
Mainshock and Aftershocks
Mw 7.2 Earthquake on 2008 Nov 16 17:02:32 (UT)
Source Time Function, Moment Tensor, Inverted Slip, and Waveform Fit
Stations used for the Teleseismic Waveform Inversion
Link
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