AFI - STATION INSTRUMENTATION

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.
The Noise Study was done using 1992 data, consequently, it is only an estimation for this generation of station instrumentation.
COMMENTS:
A description of the Digital World Wide Standardized Seismograph Network (DWWSN) 
can be found in Peterson et al (1982).