Article thumbnail

Potential for larger earthquakes in the East San Francisco Bay Area due to the direct connection between the Hayward and Calaveras Faults

By E Chaussard, R Bürgmann, H Fattahi, RM Nadeau, T Taira, CW Johnson and I Johanson

Abstract

©2015. American Geophysical Union. All Rights Reserved. The Hayward and Calaveras Faults, two strike-slip faults of the San Andreas System located in the East San Francisco Bay Area, are commonly considered independent structures for seismic hazard assessment. We use Interferometric Synthetic Aperture RADAR to show that surface creep on the Hayward Fault continues 15 km farther south than previously known, revealing new potential for rupture and damage south of Fremont. The extended trace of the Hayward Fault, also illuminated by shallow repeating micro-earthquakes, documents a surface connection with the Calaveras Fault. At depths greater than 3-5 km, repeating micro-earthquakes located 10 km north of the surface connection highlight the 3-D wedge geometry of the junction. Our new model of the Hayward and Calaveras Faults argues that they should be treated as a single system with potential for earthquake ruptures generating events with magnitudes greater than 7, posing a higher seismic hazard to the East San Francisco Bay Area than previously considered

Topics: Hayward-Calaveras Faults, InSAR, characteristically repeating earthquakes, connection, creep, Meteorology & Atmospheric Sciences
Publisher: eScholarship, University of California
Year: 2015
OAI identifier: oai:escholarship.org/ark:/13030/qt4rk455zk
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://escholarship.org/uc/it... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.