2009 Jan 03 Irian Jaya, Indonesia, Earthquakes
January 06, 2009
Strong Motion Seismology Group
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Overall Comments
An earthquake doublet occurred on January 03, 2009 (UT) near the northern coast of
Papua (Irian Jaya), Indonesia. The eastern area of the source region is
famous for frequent occurrence of earthquake doublets due to the complex
tectonic settings (e.g. Lay and Kanamori, 1980; Park and Mori, 2007).
To investigate source processes of the earthquakes, we have performed
teleseismic waveform inversions of Kikuchi and Kanamori (1991)
using displacement records observed at stations of FDSN from IRIS DMC.
We fixed the epicenters determined
by USGS and searched the focal depths to minimize the waveform fit.
The residuals of the finite fault inversions preferred low-angle south-dipping
fault planes for both the earthquakes. Significant slip exceeding 5 m
appears near the each hypocenter, and the slip distribution of the
earthquake doublet seems to be complementary.
Note that the rupture starting point of the 2nd event is
close to the edge of the slip distribution of the 1st event.
Slip Distribution of Mw 7.6 and Mw 7.4 Earthquakes
Mw 7.6 Earthquake on 2009 Jan 03 19:43:54 (UT)
Source Time Function, Moment Tensor, Inverted Slip, and Waveform Fit
Mw 7.6 Earthquake on 2009 Jan 03 19:43:54 (UT)
Stations used for the Teleseismic Waveform Inversion
Mw 7.4 Earthquake on 2009 Jan 03 22:33:42 (UT)
Source Time Function, Moment Tensor, Inverted Slip, and Waveform Fit
Mw 7.4 Earthquake on 2009 Jan 03 22:33:42 (UT)
Stations used for the Teleseismic Waveform Inversion
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