Spatiotempoal Distribution of Source Rupture Process for 1999 Chi-Chi, Taiwan, Earthquake (Revise)


Joint inversion was made using strong-ground-motion data (provided by Central Weather Bureau of Taiwan) and teleseismic data (provided by IRIS-DMC)

Result

The seismic moment Mo = 2.5 x 10**20 Nm (Mw 7.5);
The source duration T = 30 s;
Fault mechanism: (Strike, Dip, Slip)=(5, 30, 56.5);
Hypocenter: (lat.= 23.86N, lon.= 120.81E, depth= 7 km).


Distribution of fault-slip

Fig. : (upper left) Focal mechanism; (upper middle) Total moment-rate function; (lower) Distribution of coseismic slip. Star indicates the location of the initial break.


Snapshot of fault-slip

Fig. : Snapshots of the interval dislocation.


Map View

Fig. : Map view of slip distribution. Hypocenter of the main-shock determined by Central Weather Bureau of Taiwan. Blue lines represent the extent of the fault plane used in our inversion.

Waveform comparison

Fig. : Comparison of the observed waveform (Black) with the calculated waveform (Red).
Teleseismic
Strong ground motion


If you have questions, please send to yuji@eri.u-tokyo.ac.jp or kikuchi@eri.u-tokyo.ac.jp.

Last Updated: 2001 February 1




Spatiotempoal Distribution of Source Rupture Process for Taiwan Earthquake (Ms=7.7)


Inversion was made using teleseismic data (provided by IRIS-DMC)

The source process is characterized mainly by a unilateral rupture propagation. The rupture propagated 45 km to the North and 25 km to the South. The maximum dislocation is about 6 m, and Average dislocation over (70 km x 40 km) is about 2.5 m. Fault mechanism: (Strike, Dip, Slip)=(26, 27, 82) [Fix]. (Yagi and Kikuchi, 1999)


Distribution of fault-slip



Distribution of fault-slip (MAP VIEW)



Snap shot of moment release process



Waveform comparison

Black: Observation, Red: Calculation



Link

Spatiotemporal Distribution of Source Rupture Process

August 17, 1999 ( Ms7.4) Turkey Earthquake

September 30, 1999 (Ms7.5) Oaxaca Mexico Earthquake

October 16, 1999 (Mw7.1) Hector Mine, California Earthquake

If you have questions, please send to yuji@eri.u-tokyo.ac.jp or kikuchi@eri.u-tokyo.ac.jp.