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

DATES OF OPERATION:    02 Jun 1982 to 06 Sep 1989.	

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 SHZ channel was developed by at the ASL and was 
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).

Due to persistent hardware and power problems at the station there are frequent
gaps in the data.