HELL - Private Property, Miramonte, 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 HELL (HELB)
In Operation 2005/04/09 00:00:00 - Present
Elevation: 1140.0 meters
Instrumentation Broadband


Site is located on private property in the Sierra Nevada foothills east of Fresno, CA.

This station was installed in March 2005 by USArray personnel as a collaboration with the Berkeley Seismological Laboratory, and was part of the USArray component of the Earthscope program. When the Travelling Array left California in 2007, the BSL adopted this station. It has been operating as a BDSN station since March 2008.


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



Borehole Conditions

The HELL installation is based on the USArray vault design.

GPS Monument Description

Short brace monument.

Seismic Station Pictures

The vault at HELL. (Photo: H. Rademacher)

The vault at HELL. (Photo: H. Rademacher)

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-2 VBB Tri-Axial SeismometerQ330BH?,HH?,LH?,VH?00
AccelerometerKinemetrics FBA ES-T Accel. (2 g max 10 v/g)Q330HN?00
GPSTopcon Net-G3ATopcon 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
HELB completeness last year
HELB 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
HELB multipath last year
HELB multipath lifetime