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Sentinel-1 reveals ground deformation after Aegean Sea earthquake

04 August 2017

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A magnitude 6.6 earthquake occurred in the Aegean Sea on 20 July 2017, affecting the Greek island of Kos and Bodrum in south-west Turkey. Images from the Copernicus Sentinel-1 mission were used to map the ground deformation, providing valuable data for analysis.

The earthquake was shallow (10km in depth) so the deformation at ground surface was expected in the order of a few tens of centimetres. However, the offshore location of the epicenter provided limited seismological data for locating the seismic fault and imaging its geometry. Seismology was used to determine that the fault plane was striking approximately east-west, however the dip-direction was ambiguous because of the lack of adequate near-field stations. Geological data indicated both north- and south-dipping normal faults inside the greater region of Kos - Gulf of Gokova (Turkey), but little information existed for the offshore region between Kos and Bodrum.

Source: Sentinel Online

Image credit: Contains modified Copernicus Sentinel-1 data processed by Athanassios Ganas, Panagiotis Elias, Sotiris Valkaniotis (NOA) and Pierre Briole (ENS) - Sentinel-1A wrapped interferogram descending orbit showing several seismic fringes on the islet of Karaada (Turkey). The yellow star indicates the earthquake epicentre (NOA revised location)

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