A Logarithmic Model Based Simultaneous Co and Postseismic Slip Inversion Method with an Application to the 2017 Mw 7.3 Sarpol Zahāb Earthquake, Iran
Date: 4/25/2019
Time: 11:00 AM
Room: Puget Sound
The spatio-temporal co and postseismic slip estimation is generally derived based geodetic data such as GPS and radar interferometry (InSAR). The recent launch of ALOS-2 and Sentinel-1 satellites provide an opportunity to simultaneously estimate the spatio-temporal co and postseismic slip, while how to effectively integrating the multi-platform SAR datasets is still a problem due to the temporal discrepancy of SAR data epochs. Here, we develop a novel logarithmic model based inversion method to estimate the spatio-temporal co and postseismic slip by simultaneously integrating multi-platforms and multi-tracks (hereafter named multi-source) ALOS-2 and Sentinel-1 SAR datasets. The model is constructed by combining the differential interferograms from multi-source SAR datasets used as the observations and the logarithmic model determined by decay time constant and decay amplitudes, and solved by using a simple Least-Square Curve Fitting (LSCF) algorithm. In this method, the spatio-temporal co and postseismic slips are estimated directly using the individual unwrapped interferograms derived from multi-source SAR datasets. This process enables us to tackle the temporal discrepancy problem of multi-source SAR datasets and avoid the non-physical smoothing constraints on the spatial distribution of afterslip. In addition, the temporal resolution of the resultant spatio-temporal co and postseismic slip will be improved greatly compared with that estimated from single dataset. A set of simulated experiments and a case study of the 2017 Mw 7.3 Sarpol Zahāb Earthquake in the Zagros mountain belt are carried out. We find that an integration of multi-source SAR datasets enables us to achieve a better understanding seismic kinematics of the event. The method might be easily implemented in other similar large thrust events in the future.
Presenting Author: Wenbin Xu
Authors
Wenbin Xu csuwbxu@gmail.com Hong Kong Polytechnic University, Hong Kong, , China (Mainland) Presenting Author
Corresponding Author
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Xiaoge Liu 809334578@qq.com Hong Kong Polytechnic University, Hong Kong, , China (Mainland) |
A Logarithmic Model Based Simultaneous Co and Postseismic Slip Inversion Method with an Application to the 2017 Mw 7.3 Sarpol Zahāb Earthquake, Iran
Category
Advances in Tectonic Geodesy