3D displacement field retrieved by integrating Sentinel-1 InSAR and GPS data: the 2014 South Napa earthquake

Abstract

In this study the integration of Sentinel-1 InSAR (Interferometric Synthetic Aperture Radar) and GPS (Global Positioning System) data was performed to estimate the three components of the ground deformation field due to the Mw 6.0 earthquake occurred on August 24th, 2014, in the Napa Valley, California, USA. The SAR data were acquired by the Sentinel-1 satellite on August 7 th and 31 st respectively. In addition, the GPS observations acquired during the whole month of August were analyzed. These data were obtained from the Bay Area Regional Deformation Network, the UNAVCO and the Crustal Dynamics Data Information System online archives. The data integration was realized by using a Bayesian statistical approach searching for the optimal estimation of the three deformation components. The experimental results show large displacements caused by the earthquake characterized by a predominantly NW-SE strike-slip fault mechanism.

Tearing the terroir: Details and implications of surface rupture and deformation from the 24 August 2014 M6.0 South Napa earthquake, California

“…DeLong et al [2015] identified that both the coseismic and postseismic patterns of vertical deformation along this fault in 2014 occurred over a width of~50 m with no more than 15-20 cm of elevation change. Polcari et al [2016] also identify east downward relative vertical motion of~8 cm across the main fault trace along this part of the fault. This indicates wide, low-angle scarps may, in some settings, be diagnostic of Holocene strike-slip faulting rather than evidence for tectonic quiescence.…”

“…These include a component of vertical deformation that indicates centimeter‐level uplift on the west side of the fault, consistent with long‐term west side up displacement manifested by higher topography and gravity values west of the fault zone [ Langenheim et al ., ]. This is supported by analyses of lidar data [ DeLong et al ., ] and spaceborne SAR and GPS data [ Polcari et al ., ].…”

“…Polcari et al . [] also identify east downward relative vertical motion of ~8 cm across the main fault trace along this part of the fault. This indicates wide, low‐angle scarps may, in some settings, be diagnostic of Holocene strike‐slip faulting rather than evidence for tectonic quiescence.…”

Spatial variation of three-dimensional deformation: a case study in the north-eastern Beijing plain, China

“…If the ratio is between 25 % and 75 %, both regional and local-scale impact factors are important. However, the nugget effect cannot identify the sources affecting land subsidence distribution (Song et al, 2018).…”

On the Segmentation of the Cephalonia–Lefkada Transform Fault Zone (Greece) from an InSAR Multi-Mode Dataset of the Lefkada 2015 Sequence

“…The advent of remote sensing and, more specifically, the radar satellite data have provided new means of research to the scientific community for earthquake studies [22][23][24][25][26][27]. The aim of this study is to examine the fault segmentation of the CTF, taking advantage of new remote sensing radar data.…”