Shear Wave Splitting Analysis Beneath Sumatra For-Arc Inferred from Broadband Seismic Network Station

Lewi Ristiyono; Chichi Nurfaizah; Suhenri Purba; Marhaposan Situmorang

doi:10.53842/04wbc932

Authors

Lewi Ristiyono Indonesian Agency for Meteorological, Climatological and Geophysics Author
Chichi Nurfaizah Indonesian Agency for Meteorological, Climatological and Geophysics Author
Suhenri Purba Indonesian Agency for Meteorological, Climatological and Geophysics Author
Marhaposan Situmorang University of North Sumatra Author

DOI:

https://doi.org/10.53842/04wbc932

Keywords:

Shear Wave Spliting, Shear Wave Splitting, Seismic observation, Seismic Observation, anisotropy, anisotropy

Abstract

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.

Author Biographies

Lewi Ristiyono, Indonesian Agency for Meteorological, Climatological and Geophysics

Indonesian Agency for Meteorological, Climatological and Geophysics
Chichi Nurfaizah, Indonesian Agency for Meteorological, Climatological and Geophysics

Indonesian Agency for Meteorological, Climatological and Geophysics
Suhenri Purba, Indonesian Agency for Meteorological, Climatological and Geophysics

Indonesian Agency for Meteorological, Climatological and Geophysics
Marhaposan Situmorang, University of North Sumatra

Department of Physics, FMIPA, Sumatera Utara University, Medan, Indonesia

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