1. Digital World Wide Seismograph System - DWWSSN: [ DW ]

DATES OF OPERATION:  	06 Nov 1986 to 14 Mar 1989 

SEISMOMETER TYPE:
Geotech Model SL-200 series for broadband and long period data.  Geotech Model
GS-13 for short period vertical data.

DIGITAL FORMAT:
16 bit integer data words for all components.  Range: +32,767 to -32,768 counts.

EVENT DETECTOR ALGORITHIM:  
The event detector used for the SHZ channel was developed by G. Holcomb at the
ASL and is not documented.  The mid-period channels are detected on a straight 
forward amplitude basis.

Click on any of the following items for further information.

• Channel Data
• Amplitude Response to Ground Velocity
• Seismic Noise Study graph information

• Seismic Noise Level - Annual
• Seismic Noise Level - Seasonal/Diurnal

COMMENTS:
The seismograph system at Columbia College is similar in format to the DWWSSN, but
uses different seismometers.  All data is telemetered to the University of California
at Berkeley where it is recorded.