JRSC - Jasper Ridge

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

Load California Faults

Station Name	JRSC (JRSC)
In Operation	1994/06/30 21:20:00 - Present
Latitude
Longitude:
Elevation:	144.2629 meters
Instrumentation	Broadband GPS Other

Site

Location

The site is located in the Jasper Ridge Biological Preserve in Stanford, California. It is the replacement installation for the STAN location and is operated cooperatively with Stanford University.

Network

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

Geology

Serpentine

Borehole Conditions

The vault is located in an east/west adit, 20' in length, constructed for the development of Searsville Dam (circa 1900). The instruments are located in an aluminum pressure tank on a concrete pier. Apporoximately 4 meters of overburden cover the adit. The datalogger and accessory equipment are located in front of the adit.

GPS Monument Description

Shallow-drilled braced monument in hard rock.

Plots & Figures

Seismic Station Pictures

Aerial photograph of Jasper Ridge<br>Courtesy of the JRBP

Aerial photograph of Jasper Ridge
Courtesy of the JRBP

Typical STS-2 installation

GPS Station Daily Timeseries

GPS Station Pictures

JRSC

Instrumentation

Table of Seismic Instrumentation

	Sensor	Datalogger	SEED Channels	Location
Broadband	Streckeisen STS-2 VBB Tri-Axial Seismometer	Q330HR-GFE	BH?,HH?,LH?,VH?	00
Accelerometer	TSA-100S (4 g max 5 v/g)	Q330HR-GFE	HN?	00
Auxiliary	AntennaCurrent	Q330	VE?	10
	ClockPhase	Q330	LC?	10
	ClockQuality	Q330	LC?	10
	Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes)	Q330	BQ?,LQ?,VQ?	10
	InputVoltage	Q330	VE?	10
	PacketBufferUsage	Q330	VP?	10
	SystemCurrent	Q330	VE?	10
	SystemTemperature	Q330	VK?	10
	VCOValue	Q330	VC?	10
	BF7	Q330	BT?,LT?,VT?	20
	ElectroMagnetics Inc. BF4 Magnetometer	Q330	BT?,LT?,VT?	20

GPS Instrumentation

	Receiver	Antenna	Radome	-
GPS	SEPTENTRIO POLARX5	TOPCON TPSCR.G3	SCIT	-

Data & Metadata

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

Waveform Data

BK Information Directory, including
- List of station locations
- List of available channels
  - Year/month/day format
  - Year,doy format
- Instrument Response
  - SEED format
  - Simplified Responses

Querying the archives
- SeismiQuery at the NCEDC
Download waveform data

GPS Data

Site log: jrsc.log

Data Type From To

Low-rate raw --- ---

Low-rate rinex 11/30/2011 present

High-rate raw 11/30/2011 present

High-rate rinex 11/30/2011 present

Data Type	From	To
Low-rate raw	---	---
Low-rate rinex	11/30/2011	present
High-rate raw	11/30/2011	present
High-rate rinex	11/30/2011	present

Data Quality

Noise Analysis

View more noise plots

GPS Data Quality

Completeness

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

Lifetime

Multipath

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

Lifetime

Signal-to-Noise Ratio

The Signal-to-Noise ratios are the mean values above the QC elevation mask for L1 and L2 respectively.

Previous Year

Lifetime