1.  Pacific21 (formerly POSEIDON)  [ PS ]

DATES OF OPERATION: 	25 Feb 1992 to Present

SEISMOMETER TYPE:  
Streckeisen Model STS-2.

DIGITAL FORMAT:
5 1/2 figure integer data words fro all components.  Range: -199999 to 199999.

EVENT DETECTION ALGORITHM: 
By a trigger circuit that has a minimum at 2Hz.  The trigger logic is "OR" on 
the 3 components; BHZ, BHN, and BHE. 

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 corner frequency of anti-aliasing filter is 5 Hz.