Electronic Theses and Dissertation

A conventional way to determine the hypocenter of earthquake is usually calculated by a global velocity model. However, this way is not completely valid because each area has a different rock structures. Based on this model, we need to calculate velocity model to each region. In this study, we calculated velocity model for Aceh area. The model is an improvement of velocity model that developed by International Association of Seismology and Physics of Earth’s Interior (IASPEI) i.e. IASP91. In order to gain the velocity model, we inverted arrival time data of the earthquake that facilitated by Velest3.1 cod (Kissling, 1995). The data were collected from Mata Ie (BSI), Meulaboh (MLSI), Langsa (LASI), Tapaktuan (TPTI), Lhokseumawe (LHMI), and Kutacane (KCSI) stations in Aceh Province . The results show that the final model is faster than the initial model i.e. IASP91. Using the final model, we have been able to relocate the hypocenter almost precisely. Moreover, it obtained correcting station of arrival time wave in seismometers were used. Some stations have maximum and minimum values. Maximum value means the origin time was added by the correction value, and vice versa. The Adding of correction value in earthquake events of origin time should be applied to LASI i.e. 0,7s. We estimate maximum values correction are influenced by high elasticity of the rock structure. So that, the wave velocity of the earthquake is slower than minimum value.

Key words: P-Wave 1D velocity model, Relocation, Correction station value

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