HOPS - Hopland Research and Extension Ctr., Hopland, CA, USA

We operate broadband and borehole stations under the network code BK. The Berkeley Digital Seismic Network (BDSN) is a regional network of very broadband and strong motion seismic stations designed to monitor regional seismic activity as well as provide high quality data. The Berkeley borehole stations have borehole geophones or other seismic sensors and may have other geophysical instrumentation.

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 HOPS (HOPB)
In Operation 1994/10/21 02:23:00 - Present
Elevation: 299.1 meters
Instrumentation Broadband


HOPS is located at the Hopland Research and Extension Center of the University of California Agriculture and Natural Resources unit.


Berkeley Digital Seismic Network (BK)
Bay Area Regional Deformation Network Network (BARD)


Franciscan Formation

Borehole Conditions

The instruments are located in a steel and concrete vault benched into a hillside with 2 meters of soil overburden. The vault is oriented north/south to minimize the effects of solar heating. The concrete pier is covered with 4" of insulation on the sides and 8" of insulation on the top. The datalogger and supporting equipment are in an adjacent room.

GPS Monument Description

Threaded 5/8" rod cemented 0.8m deep into bedrock

Seismic Station Pictures

Installation of HOPS STS-1

Installation of HOPS STS-1

STS-1s at HOPS

STS-1s at HOPS

GPS Station Timeseries

Time series processing at the BSL

Last year Clean Clean & detrended Raw Raw & detrended
Lifetime Clean Clean & detrended Raw Raw & detrended
Text file (final results only) Clean Raw

GPS Station Pictures





Table of Seismic Instrumentation

SensorDataloggerSEED ChannelsLocation
BroadbandStreckeisen STS-1/E300 VBB Feedback Horizontal SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
Streckeisen STS-1/E300 VBB Feedback Vertical SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
AccelerometerKinemetrics FBA ES-T Accel. GFE (4 g max 5 v/g)Q330HR-GFEHN?00
GPSSeptentrio PolaRx5Topcon Choke-RingSCIGN Tall-
SensorDataloggerSEED ChannelsLocation

Waveforms and associated metadata, and GPS data, are available at the Northern California Earthquake Data Center (NCEDC).

Waveform Data

GPS Data

Noise Analysis

View more noise plots

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
HOPB completeness last year
HOPB 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
HOPB multipath last year
HOPB multipath lifetime