Group B, Poster #058, Tectonic Geodesy
Did creep stop the 2023 Mw7.8 Pazarcık earthquake rupture?
Poster Image:
Poster Presentation
2023 SCEC Annual Meeting, Poster #058, SCEC Contribution #13219 VIEW PDF
uptured segment (known as the Pütürge segment) of the EAF between the Pazarcık and Sivrice ruptures. Published research on the 2020 event suggests it may have been arrested by creep on the EAF, possibly from velocity-strengthening friction and/or reduced interseismic strain accumulation. Could creep have arrested the 2023 rupture propagation as well?
To answer this question, we analyze InSAR data over the Pütürge segment of the EAF. We use over 5000 ARIA standard product interferograms from two ascending and descending tracks of the Sentinel-1 satellites and the MintPy software to produce InSAR time series and velocity maps. Data from 2014-2020, before the Sivrice earthquake, show an abrupt line-of-sight velocity change localized from the SW end of the 2020 rupture, extending along the EAF trace to within ~10 km of the end of the 2023 rupture. This feature is suggestive of creep on the Pütürge segment at rates of 5-8 mm/yr. The juxtaposition of this creeping zone and the northeastern extent of modeled coseismic slip of the 2023 event, constrained by SAR image offset data, suggests that the arrest of the 2023 rupture by creep is plausible and warrants further investigation.
SHOW MORE
To answer this question, we analyze InSAR data over the Pütürge segment of the EAF. We use over 5000 ARIA standard product interferograms from two ascending and descending tracks of the Sentinel-1 satellites and the MintPy software to produce InSAR time series and velocity maps. Data from 2014-2020, before the Sivrice earthquake, show an abrupt line-of-sight velocity change localized from the SW end of the 2020 rupture, extending along the EAF trace to within ~10 km of the end of the 2023 rupture. This feature is suggestive of creep on the Pütürge segment at rates of 5-8 mm/yr. The juxtaposition of this creeping zone and the northeastern extent of modeled coseismic slip of the 2023 event, constrained by SAR image offset data, suggests that the arrest of the 2023 rupture by creep is plausible and warrants further investigation.
SHOW MORE