sjn/nyl   San Juan Bautista; Nyland Ranch

This creepmeter is creepmeter is a reoccupation of the SJN1 creepmeter 
initially installed by Robert Nason in 1967 and described in Schulz (1989). 
That creepmeter was abandoned in 1985 following several problems at the site.  

In 2004, Roger Bilham (U. Colorade) installed an instrument which operated for about
10 years but abandoned due to frequent flooding.

In 2020, Bilham installed another creepmeter, which hopefully, is resistant to flooding.
In 2022, day of year 151,  the baseline of the instrument was lengthened.

The data provided here starts in 2004.  The files between the pre 2014 and
post 2020 intervals have been merged, but the offset between the two sets
needs to be estimated.

For most of 2023, the site was off-line. It was rebuilt in April 2024. There
is an unknown offset between early 2023 and April 2024.

Offsets:
N 2022j1512100 site visit to extend length of creepmeter by 7m
N 2022j3281820 reset
mid-2023




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