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Data for Serpentinite-rich Gouge in a Creeping Segment of the Bartlett Springs Fault, Northern California: Comparison with SAFOD and Implications for Seismic Hazard

Metadata Updated: October 29, 2023

An exposure of a creeping segment of the Bartlett Springs Fault (BSF), part of the San Andreas system in northern California, is a ~1.5 m-wide zone of serpentinite-bearing fault gouge cutting through late Pleistocene fluvial deposits. The fault gouge consists of porphyroclasts of antigorite serpentinite, talc, chlorite, and tremolite-actinolite, along with some Franciscan metamorphic rocks, in a matrix of the same materials. The Mg-mineral assemblage is stable at temperatures above 250°-300°C. The BSF gouge is interpreted to have been tectonically incorporated into the fault from depths near the base of the seismogenic zone, and to have risen buoyantly to the surface where it is now undergoing right-lateral displacement. The ultramafic-rich composition, frictional properties, and inferred mode of emplacement of the BSF serpentinitic gouge correspond to those of the creeping traces of the San Andreas Fault identified in the SAFOD (San Andreas Fault Observatory at Depth) drillhole. This suggests a common origin for creep at both locations. A tectonic model for the source of the ultramafic-rich materials in the BSF is proposed that potentially could explain the distribution of creep throughout the northernmost San Andreas system.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:5bdc8bc2e4b0b3fc5cf02c50
Data Last Modified 20210817
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id d72d84f6-ffa8-424b-a5a6-8fa709e7cf79
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -122.99468993673,39.36827914787,-122.89031981955,39.474365473569
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 7d3108502271115fb712c9a1cb69f1226d8131b1c91e320ba613d3b36dee2720
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -122.99468993673, 39.36827914787, -122.99468993673, 39.474365473569, -122.89031981955, 39.474365473569, -122.89031981955, 39.36827914787, -122.99468993673, 39.36827914787}

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