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

DATES OF OPERATION:  	02 Mar 1981 to 02 Aug 1982

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 ALGORITHM:  
The event detector used for the SPZ 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 (DWWSSN) 
can be found in Peterson et al (1982).  Seismic background noise is similar to ANMO.
Noise is hgher under windy conditions.