ZOBO - STATION INSTRUMENTATION

1. Abbreviated Seismic Research Observatory - ASRO:   [AS]
	
Dates of Operation:  		10 Sep 1976 to September 1993

SEISMOMETER TYPE:
A three component set of Geotech long-period seismometers (S-12 horizontals and
a S-11 vertical) with a period set at 30 seconds are installed inside a sealed
tank which is filled with argon gas.  The short period vertical component is
obtained from a Johnson Matheson Model 6480 seismometer.

DIGITIAL FORMAT:
16 bit gain-ranged data words for all components.  
Range: +2,096,128 to -2,097,152 counts.

EVENT DETECTOR ALGORITHM:
The Murdock event detector (Murdock, 1983) was installed on 03 May 1983.  Prior
to this time a detector developed by the Unitech Corp., Austin, Texas was used.
This detector was not documented.

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:
The ASRO systems have the same format and the same response as the SRO systems.
The digital recording system and the software are identical to the SRO.  The
seismometers and amplifiers are the same as the HGLP.  All ASRO stations are  
HGLP stations that have been upgraded to SRO equivalent.