XPK2
Parkfield Creepmeter

Some creep events are "triggered" by rainfall!!


Wire broke during 2004 Parkfield EQ (Sept 28)
Zero has been lost.

Comparison of micrometer data with the telemetry data
for the measurements after the Parkfield EQ indicate
that the calibration of the telemetry data might not
be correct; it might be off by 4%; The calibration
might be 125 counts/mm versus the 130 that has been used.

November 2006 swap-out electronics and DCP for a new version; 
Telemetry voltage range now 0-5v; scale factor is now 122.4 counts(mv) 
per mm fault slip (creep).

Nov 28, 2006 -- revised scale factor by 4.5% after comparing digital data
to aperiodic micrometer measurements. The archival data reflects this change
in scale factor

Data after Jan 2020 is probaby bad due to lack of maintenance

Times of possible offsets:
N 201401220320 Wire reset (AS)
N 201505130320 Ditto
N 201609010230 Ditto
N 201804260150 Ditto
N 2019j1021710 ditto

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)