title: Recognition of paleoearthquakes on the Puente Hills blind thrust fault, California.
abstract: Borehole data from young sediments folded above the Puente Hills blind thrust fault beneath Los Angeles reveal that the folding extends to the surface as a discrete zone (</=145 meters wide). Buried fold scarps within an upward- narrowing zone of deformation, which extends from the upward termination of the thrust ramp at 3 kilometers depth to the surface, document the occurrence of at least four large (moment-magnitude 7.2 to 7.5) earthquakes on this fault during the past 11,000 years. Future events of this type pose a seismic hazard to metropolitan Los Angeles. Moreover, the methods developed in this study can be used to refine seismic hazard assessments of blind thrusts in other metropolitan regions.
authors.affiliation: Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740, USA. dolan@earth.usc.edu
authors.forename: James F
authors.initials: JF
authors.lastname: Dolan
authors.forename: Shari A
authors.initials: SA
authors.lastname: Christofferson
authors.forename: John H
authors.initials: JH
authors.lastname: Shaw