Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/151062
Title: Deriving centimeter-level coseismic deformation and fault geometries of small-to-moderate earthquakes from time-series Sentinel-1 SAR images
Authors: Luo, Heng
Wang, Teng
Wei, Shengji
Liao, Mingsheng
Gong, Jianya
Keywords: Engineering::Environmental engineering
Issue Date: 2021
Source: Luo, H., Wang, T., Wei, S., Liao, M. & Gong, J. (2021). Deriving centimeter-level coseismic deformation and fault geometries of small-to-moderate earthquakes from time-series Sentinel-1 SAR images. Frontiers in Earth Science, 9, 636398-. https://dx.doi.org/10.3389/feart.2021.636398
Project: 04MNS001909A620
Journal: Frontiers in Earth Science
Abstract: Small-to-moderate earthquakes (e.g. ≤Mw5.5) occur much more frequently than large ones (e.g. >Mw6.0), yet are difficult to study with InSAR due to their weak surface deformation that are severely contaminated by atmospheric delays. Here we propose a stacking method using time-series SAR images that can effectively suppress atmospheric phase screens and extract weak coseismic deformation in centimeter to sub-centimeter level. Using this method, we successfully derive coseismic surface deformations for three small-to-moderate (Mw∼5) earthquakes in Tibet Plateau and Tienshan region from time-series Sentinel-1 SAR images, with peak line-of-sight deformation ranging from 5–6 mm to 13 mm. We also propose a strategy to downsample interferograms with weak deformation signal based on quadtree mesh obtained from preliminary slip model. With the downsampled datasets, we invert for the centroid locations, fault geometries and slips of these events. Our results demonstrate the potential of using time-series InSAR images to enrich earthquake catalog with geodetic observations for further study of earthquake cycle and active tectonics.
URI: https://hdl.handle.net/10356/151062
ISSN: 2296-6463
DOI: 10.3389/feart.2021.636398
Rights: © 2021 Luo, Wang, Wei, Liao and Gong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ASE Journal Articles

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