Southern San Andreas-San Jacinto fault system slip rates estimated from earthquake cycle models constrained by GPS and interferometric synthetic aperture radar observations

Abstract The 2019 Mw 6.1 Castillejos earthquake occurred in the Zambales range of the central Luzon Island in Philippines. No active fault was reported around the seismogenic zone according to previous investigations. This earthquake draws attention for assessment in seismic risk along the Marikina Valley fault system (MVFS) near the Manila dense metropolitan population. The Coulomb failure stress (CFS) change on the MVFS is estimated by the coseismic faulting model derived from the inversion of coseismic deformation field observed from the Differential Interferometric Synthetic Aperture Radar using both the Advanced Land Observing Satellite-2 and Sentinel-1 Synthetic Aperture Radar (SAR) images. The predicted CFS change is less than 0.5 kPa that implies insignificant Coulomb stress accumulation on the MVFS after the Mw 6.1 Castillejos event. However, the recorded 14 moderate and strong earthquakes in and around the Luzon islands caused significant CFS drop on the MVFS. This might delay the occurrence of the earthquake for 0.2–50 yr on the MVFS.

Download Full-text

Heterogeneous Fault Mechanisms of the 6 October 2008 MW 6.3 Dangxiong (Tibet) Earthquake Using Interferometric Synthetic Aperture Radar Observations

Remote Sensing ◽

10.3390/rs8030228 ◽

2016 ◽

Vol 8 (3) ◽

pp. 228 ◽

Cited By ~ 3

Author(s):

Caijun Xu ◽

Bei Xu ◽

Yangmao Wen ◽

Yang Liu

Keyword(s):

Synthetic Aperture Radar ◽

Synthetic Aperture ◽

Interferometric Synthetic Aperture Radar ◽

Radar Observations ◽

Aperture Radar

Download Full-text

The Locking Depth of the Cholame Section of the San Andreas Fault from ERS2-Envisat InSAR

Remote Sensing ◽

10.3390/rs10081244 ◽

2018 ◽

Vol 10 (8) ◽

pp. 1244 ◽

Cited By ~ 1

Author(s):

Guillaume Bacques ◽

Marcello de Michele ◽

Daniel Raucoules ◽

Hideo Aochi

Keyword(s):

Remote Sensing ◽

Synthetic Aperture Radar ◽

San Andreas Fault ◽

Synthetic Aperture ◽

Interferometric Synthetic Aperture Radar ◽

San Andreas ◽

Tectonic Loading ◽

Aperture Radar

The Cholame section of the San Andreas Fault (SAF), which has been considered locked since 1857, has been little studied using geodetic methods. In this study, we propose to use Interferometric Synthetic Aperture Radar (InSAR) to contribute to the improvement of the knowledge of this section of the SAF. In particular, the objective of this work is to provide a description of the transition between the Parkfield and Cholame-Carrizo segments further southeast by producing an estimate of the locking depth of the Cholame segment by combining ERS2 (European Remote Sensing) and Envisat Advanced SAR (ASAR) satellites data. Our results indicate that the locking depth between the Parkfield and the Cholame-Carrizo segments deepens to the southeast. We then use these results as a hint to refine the tectonic loading on this section of the SAF.

Download Full-text