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

DATES OF OPERATION:  	14 Oct 1981 to 11 Mar 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: +32767 to -32768.

EVENT DETECTOR ALGORITHIM:  
The event detector used for the SHZ channel was developed 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 
(DWWSSN) can be found in Peterson et al (1982).