ARRAY TECHNIQUE APPLICATION TO DETERMINE DIRECTION OF RUPTURE OF TOHOKU’S EARTHQUAKE, MARCH 11th 2011

Deassy, Siska and Wiwit, Suryanto (2013) ARRAY TECHNIQUE APPLICATION TO DETERMINE DIRECTION OF RUPTURE OF TOHOKU’S EARTHQUAKE, MARCH 11th 2011. Proceedings of the 3rd Annual Basic science International Conference 2013, 3 (3). 17.1-17.4. ISSN ISSN 2338-0152

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Abstract

Abstract—We conduct a study using array technique to determine the rupture direction of Tohoku earthquake, Japan on March 11, 2011 at 05:46 UTC with Mw 9.0 (epicenter at 38,297oN ; 142,372oE). The research data was recorded at five stations using three components seismometer short-period type, in West Sumatera. This research began with Array Transfer Function (ARF) configuration Yellowknife and ARCESS type of array and then for array at West Sumatera. We use the Warangps from Geopsy software. Further more we used beam forming methode for analize the Fk-movie with MATLAB 7.10 (R2010a) to track the rupture direction of Tohoku’s Earthquake. Based of our analysis the back azimuth of rupture is changing from 40.180 to 46.50 with slowness of 4 – 4.4 s/deg. The position of the rupture movement suffered deflection at time intervals of 20 seconds, the first from the epicenter to northeast and then undergo reverse direction toward the southwest. At 70 seconds time intervals, the rupture back turned to the northeast of the epicenter that is gone toward the position of the Japan trenches. Keyword—array seismic, array response function, azimuth, beam forming, rupture, slowness

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