Cholame earthquake geology along the San Andreas fault

This project is focused on the study of the earthquake geology along the San Andreas Fault in the area of the Cholame segment (between Highways 58 and 46) in the south-central coast ranges.

Investigators

Dr. Ramón Arrowsmith and Jeri Young, Laura Colini, and Beth Stone from the Active tectonics, quantitative structural geology and geomorphology research group at ASU.
Dr. Lisa Grant, Eric Runnerstrom, and Miryha Gould at UC Irvine.
Dr. Dallas D. Rhodes at Georgia Southern University.

Support

We gratefully acknowledge support from the Southern Califonia Earthquake Center (SCEC)

Parkfield-Cholame-Carrizo overflight selected photos

Thumbnails, 10" jpgs, and 6 mb tif files

Related Work

Carrizo Plain paleoseismology at Bidart

Carrizo Plain paleoseismology at Van Matre Ranch

Carrizo Plain tectonic geomorphology

Parkfield

Papers!

Arrowsmith, J R., McNally, K., and Davis, J., Potential for earthquake rupture and M 7 earthquakes along the Parkfield, Cholame, and Carrizo segments of the San Andreas Fault, Seismological Research Letters, 68, 6, 902-916, 1997.

Hilley, G. E., Arrowsmith, J R., and Stone, E. M., Using microseismicity and surface offset data to define fault segment boundaries along low friction faults, with an example from the Cholame-Carrizo segment boundary along the San Andreas Fault, Southern California, Bulletin of the Seismological Society of America, 91, 427-440, 2001.
See also the web page associated with this paper:  http://activetectonics.la.asu.edu/segmentation/

Stone, E.M., Grant, L., and Arrowsmith, J R., Recent rupture history of the San Andreas Fault southeast of Cholame in the northern Carrizo Plain, California, Bulletin of the Seismological Society of America, 92, 983-997, 2002.

Young, J. J., Arrowsmith, J R., Colini, L., Grant, L. B., and Gootee, B., 3-D excavation and measurement of recent rupture history along the Cholame segment of the San Andreas Fault, Bulletin of the Seismological Society of America: Special Issue on Paleoseismology of the San Andreas fault, 92, 2,670-2,688, 2002.

Runnerstrom, E. E., Grant, L. B., Arrowsmith, J R., Rhodes, D. D., and Stone, E. M., Displacement across the Cholame segment of the San Andreas Fault between 1855 and 1896 from cadastral surveys, Bulletin of the Seismological Society of America: Special Issue on Paleoseismology of the San Andreas fault, 92, 2,659-2,669, 2002.

Proposals and reports

Arrowsmith and Rhodes SAF SCEC 1997 Annual Report
rrowsmith and Grant SAF 1998 SCEC annual report
Arrowsmith and Grant SAF 1999 SCEC proposal

Arrowsmith, Stone, and Grant SAF 1999 SCEC Annual Report:
Entire report (PDF file; 20 Mb!)
Page 1
Page 2
Page 3
Page 4
Page 5

Beth's web page with some nice images from her thesis:  http://activetectonics.la.asu.edu/Beth/AGUposter/

Arrowsmith and Grant SAF 2000 SCEC proposal

SCEC Final Technical Report

2000 trenching

Here is a rough schedule: at the bottom of Jeri's home page

Here are some ground and kite photos of the excavation on May 10 and 11, 2000:


North is generally off to the left in these two photos. The smaller trench toward the right is the 1999 trench. The two fault parallel trenches are about 40 m long.


A major operation!
Special thanks to Scott Nowicki for his remote sensing help.

Here is the rectified photo mosaic of the kite photos from May 2000.

Here is the low resolution full image: ly4kitefulllores.jpg

Here is the high resolution full image: ly4kitefullhires.jpg

Here is the tif file: ly4kitemosaic.tif

Here is the trench layout on 5_28_00:

Here is the Illustrator 8 file: trenchzoom.ai

Here is a worksheet for surveying and reoccupying the network:

Here is the Illustrator 8 file: controlmap.ai
 
 

Photos from the LY4 site, Cholame segment of the SAF, March 14 and 15, 2001

Check them out

SE trench and other at LY4 topographic surveying, March 15, 2001

Check it out
Last modified May 28, 2005
Pages maintained by
Ramon Arrowsmith.