InSAR MSBAS Time-Series Analysis of 2016 M5.8 Pawnee Earthquake

The 2016 Mw 5.8 Pawnee earthquake, part of the recent increase in seismic activity in the central United States, is Oklahoma's largest event in recorded history. The 40-fold increase in seismicity in Oklahoma from 2008 to 2013 in comparison to 1976 to 2007 is likely attributed to wastewater injection (Keranen et al., 2014). We investigate the role of wastewater injection in the triggering of the 2016 Mw5.8 Pawnee earthquake using Differential Interferometric Synthetic Aperture Radar (DInSAR). We study the preseismic, coseismic, and postseismic deformation of the event and compare the displacement with seismicity and wastewater injection activity. We develop full-resolution interferograms from Sentinel-1A/B, ALOS PALSAR, and RADARSAT-2 data using the JPL ISCE (Gurrola et al., 2010) and GAMMA (Wegmuller and Werner, 1997) packages. We remove the topographic signal by applying a 10m USGS National Elevation Dataset (NED) Digital Elevation Model (DEM) and correct for the tropospheric signal using an atmospheric phase screen. We incorporate the interferograms into a surface displacement time-series using the MSBAS algorithm (Samsonov et al., 2013, Samsonov and d'Oreye, 2012) and the JPL GIAnT software (Agram et al., 2013). We compare the time-series of surface displacement to the injection rate of regional wells and local seismicity.