Publication Date:
2023-02-28
Description:
The constant increase of geodetic instrumentation over the past decades enables us to not only detect ever smaller tectonic signals but also to monitor their evolution in time and space. We present spatial and temporal slip variations observed on a fault affected by a large, intermediate-field earthquake: the 2015 Mw7.2 Sarez, Central Pamir, earthquake ruptured the sinistral, NE-trending Sarez-Karakul fault system. 120–170 km North of the main rupture, the thin-skinned, E-trending Pamir thrust system bounding the Pamir to the North was co-seismically activated. We derived co-seismic offsets and post-seismic rates observed by two dense, high-rate Global Positioning System (GPS) profiles crossing the Pamir thrust system at different longitudes. The continuous GPS observations of the western profile focus on the dextral, NW-striking Aramkungey fault segment that connects two thrust faults with opposite dip. We compare inter-, co- and post-seismic displacement rates by complementing the continuous data with survey-mode GPS data and East rates derived from satellite radar interferometric displacement time-series. All the GPS stations were shifted toward the epicenter against the direction of the interseismic load with an increased gradient in the Aramkungey fault segment. During the postseismic stage, the fault-parallel and fault-perpendicular rates were affected differently, suggesting gradual re-locking of the Aramkungey fault after its unlocking by right-lateral co-seismic slip.
Language:
English
Type:
info:eu-repo/semantics/article
Format:
application/pdf
Permalink
