1. Global Seismograph Network - GSN:

DATES OF OPERATION:	02 Oct 1999 to Present.

SEISMOMETER TYPE AND ADC:
Teledyne Brown Model KS-54000 borehole, 3-component system for broadband, long
period, and very long period channels recorded at 20 sps, 1 sps, and 0.1 sps respectively.
Gurlap Systems model CMG-3T 3-component siesmometer for short-period channels 
continuously recorded at 40 sps.
Kinemetrics FBA-23 3-component force balance accelerometer recorded at 1 sps continuous
mode and at 100 sps triggered mode.
The data acquisition system is IDA MK7.

CALIBRATION EPOCHS:	1999, 275 - Present 
                            
DIGITAL FORMAT:
32 bit integer data words for broadband (20 sps), long period (1 sps), very
long period (0.1 sps) and short period (40 sps) channels.  16 bit integer
data words for extremely short period (100 sps) triggered channels.

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