Slip distribution and source parameters of the 20 July 2017 Bodrum-Kos earthquake (Mw6.6) from GPS observations |
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Authors: | İ Tiryakioğlu B. Aktuğ C. Ö. Yiğit H. H. Yavaşoğlu H. Sözbilir Ç Özkaymak |
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Affiliation: | 1. Faculty of Engineering, Department of Geomatics Engineering, Afyon Kocatepe University, Afyon, Turkey;2. Earthquake Research and Implementation Center, Afyon Kocatepe University, Afyon, Turkey;3. Faculty of Engineering, Department of Geophysical Engineering, Ankara University, Ankara, Turkey;4. Faculty of Engineering, Department of Geomatics Engineering, Gebze Technical University, Gebze-Kocaeli, Turkey;5. Faculty of Civil Engineering, Department of Geomatics Engineering, Istanbul Technical University, Istanbul, Turkey;6. Department of Geology, Dokuz Eylul University, Izmir, Turkey;7. Earthquake Research and Implementation Center, Dokuz Eylul University, Izmir, Turkey;8. Earthquake Research and Implementation Center, Afyon Kocatepe University, Afyon, Turkey;9. Faculty of Engineering, Department of Geology Engineering, Afyon Kocatepe University, Afyonkarahisar, Turkey |
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Abstract: | Greek-Turkish boundary near the cities Kos and Bodrum has been shaken on July 20, 2017 by a Mw6.6 earthquake. The mainshock is located offshore and did not generate an on-land surface rupture. Analyzing pre- and post-earthquake continuous/survey-type static GPS observations, we investigated co-seismic surface displacements at 20 sites to characterize source parameters and slip-distribution of the mainshock. Fault plane solutions as well as co-seismic slip distribution have been acquired through the inversion of co-seismic GPS displacements modeling the event as elastic dislocations in a half space. Fault plane solution shows a southward dipping normal-type fault segment extending a depth down to ~12 km, which remains within the brittle upper crust. Results from the distributed slip inversion show that the mainshock activated a ~65 km fault section, which has three high slip patches, namely western, central and eastern patches, where the coseismic slips reach up to 13, 26, and 5 cm, respectively. This slip pattern indicates that the pre-earthquake coupling, which is storing the slip deficit, occurred on these three patches. |
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Keywords: | GPS co-seismic The 20 July 2017 Bodrum-Kos earthquake (Mw6.6) slip rupture process |
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