Geophysical Research Letters
Supporting Information for
Potential for larger earthquakes in the East San Francisco Bay Area due to the direct
connection between the Hayward and Calaveras Faults
E. Chaussard (1,2), R. Bürgmann (1,2), H. Fattahi (3), R. Nadeau (1,2), T. Taira(1,2), C.W. Johnson (1,2),
and I. Johanson (1,2)
(1) Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, California
(2) Berkeley Seismological Laboratory, University of California, Berkeley, California
(3) Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL
Contents of this file
Figure S1: agreement between horizontal InSAR and BAVU3 GPS
Figure S2: mean vertical InSAR velocity field
Figure S3 to S5: jpegs of the high resolution figures of the main article file.
Additional Supporting Information (Files uploaded separately)
FaultSurface file contains the longitude and latitude coordinates of the new Hayward
and Calaveras surface traces.
HayCalMesh file contains the longitude latitude and depth values of the vertices
composing the triangles of the 3D mesh of the new fault geometry (down to 15 km
depth).
Repeater file contains the CRE data with the columns corresponding to Date, Latitude,
Longitude, Depth(km), and Cumulative Slip (mm).
1
Figure S1. Comparison between horizontal InSAR velocities and BAVU3 GPS velocities. InSAR
velocities are mean rate for pixels within 200 m from each GPS station. The blue circles show
pixels with a temporal coherence > 0.7 in the InSAR velocity map, the green triangles pixels with
a temporal coherence between 0.5-0.7. The strong outlier corresponds to the station CAL2 with
anomalous GPS velocities. Velocities at pixels with temporal coherence between 0.5 and 0.7 or
larger than 0.7 agree equally well with the GPS data, confirming that in the Bay Area a temporal
coherence threshold of 0.5 is acceptable.
2
Figure S2. Mean vertical ground velocity from 19 years of InSAR data in the San Francisco Bay
Area. Most of the deformation is hydrological, blue colors correspond to subsidence and red
colors to uplift, with respect to the GPS station LUTZ. Subsidence south of San Francisco has
been described by Ferretti et al. [2004] and uplift in the Santa Clara Valley, near San Jose, has
been described by Chaussard et al. [2014]. Signal in the East Bay Hills (between the HF and
north CF) suggests uplift at 0.5-1 mm/yr, which is below our confidence threshold of 2 mm/yr
and could be either associated with atmospheric noise in these higher elevation areas or related
to tectonic deformation [Bürgmann et al., 2006]. Full and dashed black lines indicate mapped
fault traces and grey diamonds indicate cities.
3
Figure S3. Same as Figure 1 of main article with larger resolution.
4
Figure S4. Same as Figure 2 of main article with larger resolution.
Figure S3. Same as Figure 3 of main article with larger resolution.
5
Data Set S1. FaultSurface file contains the longitude and latitude coordinates of the new
Hayward and Calaveras surface traces.
Data Set S2. HayCalMesh file contains the longitude latitude and depth values of the vertices
composing the triangles of the 3D mesh of the new fault geometry (down to 15 km depth).
Data Set S3. Repeater file contains the CRE data with the columns corresponding to Date,
Latitude, Longitude, Depth(km), and Cumulative Slip (mm).
6