XMR1 and XMR2
Melendy Ranch Creepmeter


May  2008 swap-out electronics and DCP for a new version; Telemetry 
voltage range now 0-5v; scale factor is now 140.4 counts(mv) per mm 
fault slip (creep).

July 2010 Conduit cave-in around invar creep wire noticed. Wire "freed-up".

October 2010 Noticed that Creep mechanical bale had been knocked-over
by rodents.  Bale reset and re-alighned.  Resulted in 1mm+ disparity
between micrometer reading and telemetried data. 

Site defunct as of 7/1/14; wire broken/conduit caved due to fault offset;
may be rehabed in the future;

Sept 5, 2018: Site rebuilt with new transducer and carbon fibre rod by R. Bilham and T. Ericksen.
From Sept 2018 through early April 2019, used on site recording; In April 2019, install
GOES telemetry.


Known Offsets:
S N 201401240010 Wire reset (AS)
N 201401240020 Ditto
N 2019j1030045 site visit telemetry reinstalled 
N 201907311641 Changed resolution from 0.1 to 0.01 mv -- Using onsite recorder between 201907311641 and 2019j3172015
S N 201908261509 wire wrap -- auto reset -- in fixit script
N 2019j3172015 Change to sutron telemetry
S N 2019j2381510 sensor wrap?
N 201912271828 site visit
N 2020j2211845 wrap of sensor
N 2020j2471821 site visit
N 2020j2552250 site visit
N 2020j2601700 site visit
N 2020j2631900 site visit  fix grounding problem
N 2021j1490101 attempted wrap of sensor
N 2021j1540435 sensor started to wrap
N 2021j1562200 wrap of sensor
N 2021j3072231 site visit to reset
N 2022j2002340 sensor wrap
S N 2024j0580000 sensor back on line after one-year
S N 2023j0990921 Sensor wrap
N 2023j1410007 Sensor wrap


-----------------IMPORTANT!!!!!!!!!!------------------------------

NOTE:  For the four year span between 2014 when the original instrument died and Sept 2019,
the site lost "zero".  Using least square regression which simultaneously estimates the
temporal correlations, a long term rate is estimated spanning the interval between 1991 and
Aug. 2019; That way, the new data could be appended to the older data.  This merged
set is available in the data archive, but one needs to be careful with any analysis
that incorporates the interval from July 2014 and Sept 2018
----------------------------------------------------------------- 

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)