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

DATES OF OPERATION:  	27 Sep 1987 to 17 Jun 1991

SEISMOMETER TYPE
Streckeisen Model STS-1/VBB, 3 component system.

DIGITAL FORMAT:
16 bit gain-ranged data words for all components.  Range: +2,096,1128 to -2,097,152 counts.

EVENT DETECTOR ALGORITHIM:  
The Murdock event detector (Murdock 1983) was installed on 03 May 1983. Prior
to that time a detector developed for the SRO/ASRO systems 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:
All of the ASRO installations were upgrades of High-Gain Long Period systems and use
the same format as the SRO.  CTAO was further upgraded in September, 1987 when
Streckeisen broadband  seismometers were installed.