Analisis Pemisahan Gelombang Geser di Bawah Daerah Busur Vulkanik Sumatra yang Diperoleh dari Stasiun Jaringan Seismik Broadband.

Ristiyono, Lewi
Nurfaizah, Chichi
Purba, Suhenri
Situmorang, Marhaposan

Journal of Computation Physics and Earth Science
Vol 1 No 1 (2021): Jurnal Fisika Komputasi dan Ilmu Kebumian

The observation of broadband network seismic had been deployed in Sumatra For-Arc. The waveform data for this study were recorded from January 2014 – December 2016. The earthquake event data were selected with the epicenter of around 950 – 1800 in distance and Magnitude with more than 7 Mw. In this case, we use shear wave splitting to determine an anisotropic structure in Sumatra For-arc. Seismic Anisotropy can perform as a tool to classify and observe anisotropic structures of subsurface deformation processes beneath Sumatra For-Arc. The valid outcomes, in this case, have been gained that they only correspond to the upper layer, which has the delay time duration of 0.5 – 0.8 s is the anisotropic layer located in the Mentawai Island. The fast an anisotropic polarization direction found in Sumatra For-arc are parted into NE-SW direction found on the upper layer.