Evaluation of the 2012 Indian Ocean coseismic fault model in 3-D heterogeneous structure based on vertical and horizontal GNSS observation

Cecep Pratama, Takeo Ito, Takao Tabei, Fumiaki Kimata, Endra Gunawan, Yusaku Ohta, Tadashi Yamashina, Irwandi Nurdin, Didik Sugiyanto, Umar Muksin, Nazli Ismail, Irwan Meilano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

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 three-dimensional 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.

Original languageEnglish
Title of host publicationInternational Symposium on Earth Hazard and Disaster Mitigation, ISEDM 2017
Subtitle of host publicationThe 7th Annual Symposium on Earthquake and Related Geohazard Research for Disaster Risk Reduction
EditorsIrwan Meilano, Takeo Ito, Phil R. Cummins, Zulfakriza
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735417038
DOIs
Publication statusPublished - 2018 Jul 18
Event7th International Symposium on Earth Hazard and Disaster Mitigation, ISEDM 2017 - Bandung, Indonesia
Duration: 2017 Nov 202017 Nov 21

Publication series

NameAIP Conference Proceedings
Volume1987
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th International Symposium on Earth Hazard and Disaster Mitigation, ISEDM 2017
CountryIndonesia
CityBandung
Period17/11/2017/11/21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Pratama, C., Ito, T., Tabei, T., Kimata, F., Gunawan, E., Ohta, Y., Yamashina, T., Nurdin, I., Sugiyanto, D., Muksin, U., Ismail, N., & Meilano, I. (2018). Evaluation of the 2012 Indian Ocean coseismic fault model in 3-D heterogeneous structure based on vertical and horizontal GNSS observation. In I. Meilano, T. Ito, P. R. Cummins, & Zulfakriza (Eds.), International Symposium on Earth Hazard and Disaster Mitigation, ISEDM 2017: The 7th Annual Symposium on Earthquake and Related Geohazard Research for Disaster Risk Reduction [020011] (AIP Conference Proceedings; Vol. 1987). American Institute of Physics Inc.. https://doi.org/10.1063/1.5047296