3. Abbreviated Seismic Research Observatory -ASRO:  [ AS ]

DATES OF OPERATION: 	15 Jun 1977 to 23 Aug 1988.

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.

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

EVENT DETECTOR ALGORITHIM:
The Murdock event detector (Murdock, 1983) was installed on 03 May 1983.  Prior 
to that 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 same as the HGLP.