1. Evaluation of the 2012 Indian Ocean Coseismic Fault Model in 3-D Heterogeneous Structure based on Vertical and Horizontal GNSS Observation.
- Author
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Cecep Pratama, Takeo Ito, Takao Tabei, Fumiaki Kimata, Gunawan, Endra, Yusaku Ohta, Tadashi Yamashina, Nurdin, Irwandi, Sugiyanto, Didik, Muksin, Umar, Ismail, Nazli, and Meilano, Irwan
- Subjects
METEOROLOGICAL observations ,EARTHQUAKES ,GEOLOGIC faults ,SEISMIC migration ,TOPOGRAPHY ,BATHYMETRY - Abstract
Lack of observation network in the vicinity of oceanic intraplate earthquake lead the estimation of coseismic fault slip with high uncertainty. Satriano et al. [2] and Wei et al. [3] found NNE trending left-lateral slip as the primary features. In another hand, Yue et al. [4] and Hill et al. [5] proposed WNW trending right-lateral faults structure as the main characteristic. Here, we investigate the coseismic fault model that could explain the coseismic offset both vertical and horizontal in a 3-D heterogeneous earth structure. We constructed finite element model that include threedimensional velocity structure, topography/bathymetry, spherical-earth and subducting slab. In this study, we employed scaling slip to adjust slip amount and total seismic moment. Instead of original slip amount, we preserve seismic moment as a basis comparison. Based on vertical and horizontal observation data, WNW trending right-lateral fault could fit better than NNE trending left-lateral fault. The present study demonstrates best-fit calculation using scaling slip optimized to the horizontal or vertical observation lead the both fault model worsen the misfit of vertical or horizontal component, respectively. This result analysis indicates a trade-off between vertical and horizontal component and reflects the importance of revisiting the fault slip modeling incorporating vertical and horizontal data equally. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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