What is it about?

This study focuses on the seismicity and stress inversion analysis of the Simav region in western Turkey. The latest moderate-size earthquake was recorded on May 19, 2011 (M w 5.9), with a dense aftershock sequence of more than 5,000 earthquakes in 6 months. Between 2004 and 2018, data from earthquake events with magnitudes greater than 0.7 were compiled from 86 seismic stations. The source mechanism of 54 earthquakes with moment magnitudes greater than 3.5 was derived by using a moment tensor inversion. Normal faults with oblique-slip motions are dominant being compatible with the NE-SW extension direction of western Turkey. The regional stress field is assessed from focal mechanisms. Vertically oriented maximum compressional stress (σ1) is consistent with the extensional regime in the region. The σ1 and σ3 stress axes suggest the WNW-ESE compression and the NNE-SSW dilatation. The principal stress orientations support the movement direction of the NE-SW extension consistent with the mainly observed normal faulting motions.

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Why is it important?

This study focuses on the seismicity and stress inversion analysis of the Simav region in western Turkey.

Perspectives

This article reports on the results obtained from the analysis of seismicity and stress regime of the Simav region. There is no clear alignment on the rupture plane observed after the relocation of the earthquake sequence after the May 19, 2011, Simav mainshock. Local stress field and focal mechanism characteristics are consistent with the tectonic regime, crustal deformation, and seismicity pattern of the study area.

Ahu Kömeç Mutlu
Gebze Teknik Universitesi

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This page is a summary of: Seismicity, focal mechanism, and stress tensor analysis of the Simav region, western Turkey, Open Geosciences, January 2020, De Gruyter,
DOI: 10.1515/geo-2020-0010.
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