1. Global Seismograph Network - GSN:

DATES OF OPERATION:	09 Jun 1997 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.  Streckeisen model STS-2 triaxial seismometer
short period channels recorded at 40 sps continuous mode.
Kinemetrics FBA-23 three component force balance accelerometer recorded
at 1 sps continuous mode and at 100 sps triggered mode.  IDA MK7 data
acquisition system.

CALIBRATION EPOCHS:	1997, 160 - 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