Continuous Monitoring of Seismic and Aseismic Slip along the Chaman Fault System from InSAR
Abstract
The Chaman fault system (Afghanistan, Pakistan) is a major tectonic boundary between the Indian and Eurasian plates, that accommodates 2-4 cm/yr of long-term sinistral slip rate. However, very few large earthquakes have been recorded on this 850 km-long fault system and, thus, a vast amount of slip has to be released aseismically. In order to characterize the recent spatial and temporal distribution of slip, we build and continuously update a time series of ground deformation from 2014 to 2019 using InSAR data from the ongoing Sentinel1 mission (European Space Agency). Efficient monitoring of the fault is performed by a Kalman filter time series analysis, which enables rapid update of pre-existing time series. We identify and characterize the along-fault segmentation of slip with notably an 80 km-long segment creeping at 7±2 mm/yr. Moreover, we identify the signature of three Mw5+ earthquakes and their associated post seismic signal. We discuss the dynamics of fault creep and its interplay with seismic slip along this major plate boundary.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T43G0382D
- Keywords:
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- 1242 Seismic cycle related deformations;
- GEODESY AND GRAVITY;
- 7223 Earthquake interaction;
- forecasting;
- and prediction;
- SEISMOLOGY;
- 8118 Dynamics and mechanics of faulting;
- TECTONOPHYSICS;
- 8163 Rheology and friction of fault zones;
- TECTONOPHYSICS