Geoinformatics Unit

Preliminary Analysis of Earthquakes in California Using Sentinel-1 Data

July 14, 2019

On 4 and 6 July 2019, two earthquakes (M 6.4 and M 7.1) struck SE California in the United States. The Geoinformatics Unit, RIKEN Center for Advanced Intelligence Project conducted a preliminary analysis of the affected areas using ESA's Sentinel-1 SAR data.

Analyzed pre-event image: 2019.06.28
Analyzed post-event image: 2019.07.10
Orbit direction: Ascending (orbit 64) - Incidence angle: 39.15 degrees - Line of Sight: Left to right.

Synthetic aperture radar interferometry (InSAR) was carried out over California to investigate tectonic deformations using two Sentinel-1 images. White lines are the faults. Yellow stars are the earthquakes. Each fringe is approximately 2.8 cm displacement in line of sight of the satellite.

Figure 4 is the RGB color composite of the affected area.
R band: 2019.06.28 VH
G band: 2019.06.28 VV
B band: 2019.06.28 VV

Figure 5 is the RGB color composite of the affected area.
R band: Differential backscattering coefficient
G band: InSAR coherence
B band: 2019.07.10 VV

img12

Ground displacement calculated from amplitude cross-correlation of Sentinel-1 data, Ridgecrest, California.