Temporal variation in crustal shear wave splitting associated with a moderate earthquake around Nias Island, Indonesia

Abstract We investigate temporal variation in shear-wave splitting parameters of local earthquakes around Nias Island, the northern part of Sumatran forearc. We analyse a total of 79 high-quality splitting measurements recorded at a GEOFON seismic station (GSI) from 2009-2015. We observe that there...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 2243; no. 1; pp. 12032 - 12037
Main Authors Syuhada, S, Anggono, T, Febriani, F, Arifin, J, Prasetio, A D, Dewi, C N, Hasib, M, Sulaiman, A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.06.2022
Subjects
Crack geometry
Delay time
Earthquakes
Physics
S waves
Splitting
Indonesia
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Summary:Abstract We investigate temporal variation in shear-wave splitting parameters of local earthquakes around Nias Island, the northern part of Sumatran forearc. We analyse a total of 79 high-quality splitting measurements recorded at a GEOFON seismic station (GSI) from 2009-2015. We observe that there is no clear time variation in the fast polarization of the splitting waves. On the other hand, an increase in the delay time of the splitting waves is found prior to a medium earthquake that occurred around the island in August 2010. Therefore, we suggest that this temporal change may be related to the change in crack geometry of rocks following the accumulation of the stress in the crust before the earthquake occurred.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2243/1/012032