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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Published in | Journal of physics. Conference series Vol. 2243; no. 1; pp. 12032 - 12037 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
01.06.2022
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 1742-6588 1742-6596 |
DOI: | 10.1088/1742-6596/2243/1/012032 |