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  • Title: Recognition of paleoearthquakes on the Puente Hills blind thrust fault, California.
    Author: Dolan JF, Christofferson SA, Shaw JH.
    Journal: Science; 2003 Apr 04; 300(5616):115-8. PubMed ID: 12677063.
    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.
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