CRR1
Carr Ranch creepmeter

Site defunct since 5/10/15 due to wire binding/conduit caved due to fault offset;
remediated Feb. 2018;

Has "CalTech" style electronics


Sensor failed on Feb 10 1998; sensor
removed.

Change in scale factor in 1998


To reconcile micrometer and telemetry data, the
telemetry data from Dec 2, 1999 through Feb 21, 2000 was
deleted and 5.9 mm of "slip" was added to the telemetry
data to match (approximately) the micrometer measurements.
Telemetry data from Dec 2, 1999 through Feb 21, 2000
appeared noisy; notes about apparent solution were
either not made or lost.

2004 Parkfield (Sept 28)  'pegged' the creepmeter;
loosen wire at creepmeter and let 35 mm of wire slide
to get a micrometer measurement of 25.1mm

April 2007 DCP was swapped out for new one; electronics
remain the same as output is 0 to 1 volt. Scale factor change of
ratio 1000/409.6

Scale factor is now 146.6 counts(mv) per mm 
fault slip (creep).

Times of possible offsets:
N 201402120040 Wire Reset
N 201505132000 Ditto
S N 201505132010 Ditto
N 201506101920 Potentiometer reset (AS)
N 201506141850 Ditto

Site completely failed March 2017; More likely, it stopped recording creep in 2014

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)