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Strain rates in the Anatolia-Caucasus Region from Sentinel-I InSAR and GNSS, and Integration with Earthquake Catalogues

Description: 

Geodetic measurements of surface deformation can provide crucial constraints on a region’s tectonics and seismic hazard. To do so effectively, they need to be spatially dense (enough to highlight individual faults), spatially extensive (enough to capture the entirety of strain signals), temporally dense (enough that noise and nuisances can be understood), temporally extensive (enough to bring out gradual interseismic deformation), and accurate. A combination of InSAR and GNSS data is arguably the first data form that can be all five of these. In the Anatolia-Caucasus region, we are using Sentinel-IA InSAR frame velocities from the COMET LiCS system and pairing them with a high-quality GNSS velocity field to generate high-resolution maps of crustal deformation and strain rate. We find that the North Anatolian Fault is the dominant feature in the strain accumulation field, but also resolve deformation coinciding with other tectonic structures in western and southern Anatolia and throughout the Caucasus. To compare these strain rates with earthquake occurrence rates, we assemble an integrated earthquake catalogue for the region that covers many hundred years, and assess whether the moment release in earthquakes has kept up with the moment accumulation rates implied by our strain maps.

Session: From Earthquakes to Plate Boundaries: Insights Into Fault Behavior Spanning Seconds to Millennia

Type: Oral

Date: 4/20/2023

Presentation Time: 10:00 AM (local time)

Presenting Author: Chris Rollins

Student Presenter: No

Invited Presentation: 

Authors