XSJ2/XSJ3

San Juan Bautista Creepmeter

Site defunct as of 12/8/16; vault flooded with mud slurry; remediated Nov. 2017

July 2006  wire broke; needed to wait until
         farm field was harvested

Feb 2007  excavate the anchor end. Install
        new InVar wire
       NEW ZERO  call site XSJ3 now

November 2007 swap-out electronics and DCP for a new version; Telemetry 
voltage range now 0-5v; scale factor is now 149 counts(mv) per mm 
fault slip (creep). 

April 1, 2011  Change in scale factor by 6% based upon comparison of digital
data with aperiodic micrometer measurements; archived data uses this correction.

Possible offsets:
S N 201404171700 Site visit (AS)  Too small (0.06+/0.04 mm) to be detected; friction in system (JOL)
N 201405072240 Site visit (AS)
N 201405072320 Site visit (AS)
N 201504220050 Wire Reset (AS)
N 201506111830 Site visit (AS)


For more information, please consult:
Open-File Report 2024-1011, “Summary of Creepmeter Data from 1980 to 2020—Measurements Spanning the Hayward, Calaveras, and San Andreas Faults in Northern and Central California” https://pubs.usgs.gov/publication/ofr20241011

and
Open File Report 89–650, "Catalog of creepmeter measurements in California from 1966 through 1988" https://pubs.usgs.gov/publication/ofr89650

Many people have contributed to this project including:
Roger Bilham
Robert Burford
Sandy Schulz
Andy Snyder
Kate Breckinridge
Todd Erickson
Rich Liechti
Vince Keller
John Langbein

For questions, contact John Langbein (langbein@usgs.gov)