Geodetic Constraints on the 2014 M 6.0 South Napa Earthquake

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

“…1), and ~340°/165° strike depending on the dip (east-dipping or westdipping, respectively). This is also in agreement with previous works showing a rupture propagating NNW for about 15 Km [Barnhart et al, 2015] and reaching the surface with a maximum slip of about 46 cm near the city of Napa [Hudnut et al, 2014]. Also he E-W component is significant, especially along the southern part of the fault (Fig.…”

“…Other interpolation techniques such as the Inverse Distance Weighting (IDW) will be explored in future developments by taking into account the spatial discontinuity due to the fault system. Finally, as revealed by several studies [Barnhart et al, 2015;Brocher et al, 2015;Ji et al, 2015], the earthquake epicenter is located 1.7 Km westward of the known West Napa Fault system, and it mostly ruptured unmapped portions of this fault system. Therefore, to fully address all of the observed features, as well as to provide new insights about the slipping fault, additional investigations are required regarding, for example, the inversion of the optimized 3D co-seismic deformation field and the spatial and temporal distribution of the seismicity associated to the main shock.…”

“…The present study proposes an InSAR-GPS data integration [Samsonov and Tiampo, 2006] using Sentinel-1 SAR data acquired at the time of occurrence (August 24th, 2014) of the Mw 6.0 South Napa earthquake. The epicenter of this earthquake was located within the western sector of the West Napa Fault system, a strike-slip crustal structure between the Rodger's Creek and Green Valley faults, with nearly pure NNW attitude [Barnhart et al, 2015]. Sentinel-1A was launched on April 3rd 2014, from the European Spaceport in French Guiana, representing the first of a constellation of two satellites .…”

Source parameters of the 2014 Mw 6.1 South Napa earthquake estimated from the Sentinel 1A, COSMO-SkyMed and GPS data

“…On 24 August 2014 at 10:20:44.03 (UTC) an earthquake of moment magnitude Mw 6.1 occurred in Napa city and the surrounding area (Barnhart et al, 2015;Wei et al, 2015,). This event is the biggest tremor to hit the San Francisco Bay Area since the 1989 Mw 6.9 Loma Prieta earthquake, and caused significant property damage, killed one person, injured about 200 people and interrupted the power supply to more than 69,000 Pacific Gas and Electric Company customers (Wiki, 2014).…”

Structural health monitoring of engineered structures using a space-borne synthetic aperture radar multi-temporal approach: from cultural heritage sites to war zones

“…Since the launch of ERS-1 in 1991 SAR gained more importance as a tool for studying natural and anthropogenic phenomena [4], but only the second generation of SAR sensors designed as constellations of satellites enabled a near real time response capability [5,6]. Several examples have been recently published with regard to earthquakes, volcanoes, landslides, glaciers, and natural hazards, fully exploiting the short-repeat acquisition time of SAR constellations [7][8][9][10][11][12]. The all-weather multi-temporal characteristics of SAR make SAR-derived products suitable for SHM systems especially in areas where in situ measurements are not feasible or not cost-effective.…”