Southern California Seismic Network

(California Institute of Technlogy (Caltech) and

United States Geological Survey (U.S.G.S) Pasadena Office)

Date: March 9, 1998

Location, Contact, and Address:

Southern California Seismic Network recorded at Pasadena, California on the Caltech Campus.

Philip Maechling (phil@gps.caltech.edu) 626 395-3801

1200 E. California Blvd. MS 252-21
Pasadena CA 91125
 

Network Characteristics:

Analog Network:

~250 Analog stations with 350 seperate channels and approximately 20 low gain channels.
Analog data are digitized and processed by the Caltech/USGS Seismic Processing System (CUSP) .
This system utilizes VAX hardware and the VMS operating system.
 

Digital Network:

~55 24-bit digital stations with both 3 component broad-band sensors,
                            and 3 component strong motion sensors.
~25 19-bit digital instruments with 3 component strong motion sensors.

The number of digital data channels recorded continuously exceeds 500 channels due to the
multiple sensors per site, and the various sampling rates at which our dataloggers generate data.

This network is recorded using a Sun Enterprise 4000 running Solaris 2.5.1



Description of Current Earthworm Usage:

We use the Solaris version of Earthworm for association, location, and earthquake information distribution. We've introduced our own broadband picker, to supply picks to Binder, and our own magnitude program for use with Earthworm. This software runs on our operational real-time seismic monitoring system. It supplies information to the Caltech/USGS staff during Southern California earthquakes.

We also have demonstrated waveform and parametric data distribution from the Caltech/USGS CUSP system over to our digital network processing system using Earthworm messaging techniques. We implemented Earthworm style messages and messaging code on the VAX/VMS system and have been able to distribute data from CUSP to our SUN, running our code on CUSP and regular Earthworm code on the Sun.
 
Standard EarthWorm Modules in current Use:

Earthworm code (v2.0) running on a SUN Enterprise 4000 under Solaris-2.5.1

Associated programs/modules already developed or adapted here:

Development Plans:

Our Development Directions:


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