Speaker
Description
The various microplates collided and resulted in Sulawesi Island. Compression stress became the main force at the beginning of tectonic episodes. Nowadays, two subductions still exist. However, it is still an open question whether those two subductions significantly contribute to seismic wave arrival times. The global 1-D and 3-D velocity models are used to identify the residual patterns in Sulawesi Island and its surroundings. The low frequency band (0.05-0.2 Hz) represents regional features, while the high frequency band (0.5-1.5 Hz) is more sensitive to local features used in this study. A broad frequency band (0.01-1 Hz) is also used to accommodate the low and high frequency parts. Residual arrival times are also frequency and azimuth dependent, varying with the medium through which the ray path travels. Besides, we use deep local seismic to represent the past and present internal deformation. In addition, we use teleseismic data to identify the shear wave splitting phenomenon from plate motion. The delay time is also considered to determine the arrival time of the S and S(K)KS phases. The delay time and shear wave splitting phenomenon contributed more to the northern part by the subduction system. Then, the basin and faults contributed more to the central and southern parts of Sulawesi Island.
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