It was the first earthquake observed to be associated with mainly horizontal fault displacement.
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Evidence is growing that a giant horizontal fault runs about nine miles beneath the Bay Area, scientists say.
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The horizontal fault may also be the source of hypothetical buried thrust faults that may lurk beneath the Bay Area, scientists speculate.
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In other words, the horizontal fault may be a tongue-like extension of the Pacific plate that slid under the Bay Area and remained there, unable to sink further into the crust.
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The horizontal fault's existence is inferred from seismic data from the so-called BASIX experiment, for Bay Area Seismic Imaging eXperiment . ( CQ ) In recent years BASIX scientists from USGS used sonar-like devices to map geological features beneath the Bay floor.
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A model of GeoGateway, based on a United States Geological Survey mechanism of a near-horizontal fault as well as location of aftershocks showed that the fault had an 11?dip towards the north, striking at 295? wide, long, and had a dip slip of.
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