UCD1 - UC Davis, Davis, CA, USA

BARD is our GPS network for monitoring crustal deformation across the Pacific-North America plate boundary and in the San Francisco Bay Area for earthquake hazard reduction studies and rapid earthquake emergency response assessment

Station Name UCD1
In Operation 05/19/1996 - present
Elevation: -0.3 meters
Instrumentation GPS


On the roof of the UC Davis Geology Building. 5/8" threaded rod bolted to concrete


BARD (Bay Area Regional Deformation Network)

GPS Monument Description

On the roof of the UC Davis Geology Building. 5/8" threaded rod bolted to concrete

Table of Seismic Instrumentation

GPSTrimble NetRSTrimble Choke-ringNONE

GPS data is available at the Northern California Earthquake Data Center (NCEDC).

GPS Data

GPS Data Quality


Data completeness is defined both as "Completeness of observations" and "Cycle slips per observation". "Completeness of Obs." is the number of epochs in the final RINEX file normalized to the expected number. This percentage will go down if time is missing from the RINEX file. "Cycle slips per Obs." is the total number of detected cycle slip normalized to the total number of observations in the RINEX file. This number will increase as the receiver loses lock on satellites more frequently.

Previous Year
UCD1 completeness last year
UCD1 completeness lifetime


The effects of multipath on the data are estimated by parameters for L1 and L2 (MP1 and MP2 respectively); see Estey and Meertens (GPS Solutions, 1999) for derivation. The daily value is the RMS of MP1 and MP2 throughout the day and for all satellites. Higher values indicate a greater prevalence and/or strength of multipathing, i.e. objects on the ground are providing multiple reflection pathways from the satellite to antenna.

Previous Year
UCD1 multipath last year
UCD1 multipath lifetime