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Missing link between the Hayward and Rodgers Creek faults
Janet Watt1, David Ponce2, Tom Parsons2
1U.S. Geological Survey, Santa Cruz, CA 95060, USA.
Science Advances
|October 25, 2016
Summary
The Hayward and Rodgers Creek faults in the San Francisco Bay Area are directly connected, increasing seismic hazard. This connection could trigger a magnitude 7.4 earthquake, posing significant risks.
Area of Science:
- Geophysics
- Seismology
- Earthquake Science
Background:
- The San Francisco Bay Area faces significant seismic risk from major faults.
- The relationship between the Hayward and Rodgers Creek faults beneath San Pablo Bay was previously unknown.
Purpose of the Study:
- To investigate the subsurface connection between the Hayward and Rodgers Creek faults.
- To assess the seismic hazard implications of their geometric relationship.
Main Methods:
- Detailed subsurface imaging techniques were employed.
- Geophysical interpretation and kinematic modeling were integrated.
Main Results:
- Definitive evidence of active faulting along the Hayward fault in San Pablo Bay was found.
- The Hayward fault was observed bending towards the Rodgers Creek fault, indicating a direct surface connection.
- A simultaneous rupture scenario of both faults could lead to a magnitude 7.4 earthquake.
Conclusions:
- The Hayward and Rodgers Creek faults are directly connected at the surface.
- This direct connection has significant implications for earthquake dynamics and seismic hazard in the region.
- A potential M7.4 earthquake resulting from simultaneous rupture could cause widespread devastation and economic impact.
Keywords:
Active faultsdeformation modelingfault discontinuitiesfault geometryfault kinematicsgravityhigh-resolution seismic reflection imagingintegrative geophysicsmagneticsmulti-fault earthquakesMore Related Videos
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