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

DATES OF OPERATION:  	15 May 1981 to 26 Apr 1987 

SEISMOMETER TYPE:
Benioff short-period vertical seismometer.  Geotech Model 1051 for SHZ data. 
Sprengnether Long Period seismometers (one vertical Model S-5007-V previously
Model 201 and two horizontal Model S-5007-H previously Model 100) which 
are used for both long period and mid-period 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 SZ 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:
A description of the Digital World Wide Standardized Seismograph Network (DWWSN) 
can be found in Peterson et al (1982).