SCCB - Santa Clara Co. Comm. Cntr., Santa Clara, 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 SCCB (LUTZ)
In Operation 2000/04/28 11:17:00 - Present
Elevation: 98.4 meters
Instrumentation Broadband


The SCCB site is located at the Santa Clara County communications facility in south San Jose. This site is centrally located within the Santa Clara valley on a serpentine and Franciscan outcrop. Emergency response dispatchers and personnel are at the site around the clock. Power at the site is backed up by uninterruptible power supplies and diesel generators. This is also the location of the BARD station LUTZ.

SCCB is one of currently two BDSN sites that consisting of a strong-motion sensor and Q730 datalogger. The HFN station RFSB has a surface strong-motion sensor and Q730 datalogger in addition to the borehole installation.


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



Borehole Conditions

Construction at the site was limited to trenching from an existing concrete radio and microwave vault to a rock outcrop situated 100 meters from the building. By locating the seismometer outside the concrete building, free-field interference was minimized. A concrete pad was poured to level the seismometer at that location. A double shielded cable was used to connect the seismometer to the datalogger, in order to minimize RF pickup from the nearby emergency transmission equipment. Ferrite beads were added to the cable to further reject unwanted RF which could couple into the cable.

GPS Monument Description

Threaded 5/8" rod cemented in bedrock

Seismic Station Pictures

View of SCCB container

View of SCCB container

View of SCCB vault

View of SCCB vault

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
AccelerometerKinemetrics FBA ES-T Accel. (2 g max 10 v/g)Q330HR-GFEHN?00
GPSTopcon Net-G3AAshtech Choke-RingSCIGN Short-
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
LUTZ completeness last year
LUTZ 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
LUTZ multipath last year
LUTZ multipath lifetime