Abstract The mechanisms of unusual shallow intraplate earthquakes that occasionally occur in stable cratons remain poorly understood. Here we analyze coseismic and postseismic displacement fields associated with the 2016 Petermann Ranges earthquake in central Australia using interferometric synthetic aperture radar data. The earthquake ruptured a previously unmapped fault and was dominated by thrust slip motion of up to 95 cm within the top 3 km of the crust. Postseismic deformation analysis suggests that a combination of poroelastic rebound and afterslip are responsible for the observed signals. The inferred afterslip overlapping spatially with the coseismic rupture highlights that the postseismic slip is coupled with the pore fluid flow around the fault zones. Analysis of historic groundwater-level changes suggests that shallow seismicity around the Petermann Ranges may have been triggered by environmental stress perturbations due to the fluctuations of groundwater level; however, it is not easy to document statistical significance of this correlation.
%0 Journal Article
%1 doi:10.1029/2018GL080510
%A Wang, Shuai
%A Xu, Wenbin
%A Xu, Caijun
%A Yin, Zhi
%A Bürgmann, Roland
%A Liu, Lin
%A Jiang, Guoyan
%D 2019
%J Geophysical Research Letters
%K central from:gisitpuma Australia, InSAR, earthquake shallow cycle seismicity,
%N 6
%P 3189-3198
%R 10.1029/2018GL080510
%T Changes in Groundwater Level Possibly Encourage Shallow Earthquakes in Central Australia: The 2016 Petermann Ranges Earthquake
%U https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL080510
%V 46
%X Abstract The mechanisms of unusual shallow intraplate earthquakes that occasionally occur in stable cratons remain poorly understood. Here we analyze coseismic and postseismic displacement fields associated with the 2016 Petermann Ranges earthquake in central Australia using interferometric synthetic aperture radar data. The earthquake ruptured a previously unmapped fault and was dominated by thrust slip motion of up to 95 cm within the top 3 km of the crust. Postseismic deformation analysis suggests that a combination of poroelastic rebound and afterslip are responsible for the observed signals. The inferred afterslip overlapping spatially with the coseismic rupture highlights that the postseismic slip is coupled with the pore fluid flow around the fault zones. Analysis of historic groundwater-level changes suggests that shallow seismicity around the Petermann Ranges may have been triggered by environmental stress perturbations due to the fluctuations of groundwater level; however, it is not easy to document statistical significance of this correlation.
@article{doi:10.1029/2018GL080510,
abstract = {Abstract The mechanisms of unusual shallow intraplate earthquakes that occasionally occur in stable cratons remain poorly understood. Here we analyze coseismic and postseismic displacement fields associated with the 2016 Petermann Ranges earthquake in central Australia using interferometric synthetic aperture radar data. The earthquake ruptured a previously unmapped fault and was dominated by thrust slip motion of up to 95 cm within the top 3 km of the crust. Postseismic deformation analysis suggests that a combination of poroelastic rebound and afterslip are responsible for the observed signals. The inferred afterslip overlapping spatially with the coseismic rupture highlights that the postseismic slip is coupled with the pore fluid flow around the fault zones. Analysis of historic groundwater-level changes suggests that shallow seismicity around the Petermann Ranges may have been triggered by environmental stress perturbations due to the fluctuations of groundwater level; however, it is not easy to document statistical significance of this correlation.},
added-at = {2019-05-20T13:20:02.000+0200},
author = {Wang, Shuai and Xu, Wenbin and Xu, Caijun and Yin, Zhi and Bürgmann, Roland and Liu, Lin and Jiang, Guoyan},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/29d94356314d702f8dcfada82379fcee0/geoinst},
doi = {10.1029/2018GL080510},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL080510},
interhash = {eab4be95929e0ca6b444019e95fbef19},
intrahash = {9d94356314d702f8dcfada82379fcee0},
journal = {Geophysical Research Letters},
keywords = {central from:gisitpuma Australia, InSAR, earthquake shallow cycle seismicity,},
number = 6,
pages = {3189-3198},
timestamp = {2019-05-20T11:20:02.000+0200},
title = {Changes in Groundwater Level Possibly Encourage Shallow Earthquakes in Central Australia: The 2016 Petermann Ranges Earthquake},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL080510},
volume = 46,
year = 2019
}