1. Cooperative New Madrid Seismic Network:   [ NM ]

DATES OF OPERATION:  	1999 day 56 to Present

SEISMOMETER TYPE and ADC:
Guralp CMG-40T  from 1999,056,21:00:00.0000 to 1999,111,14:28:00.0000
Guralp CMG-3ESP from 1999,111,14:28:00.0000 to present
a Kimemetrics Episensor was added 2004,174,14:54:00.0000 to present

ADC is Quanterra Model Q-380 from 1999,056,21:00:00.0000 to 2004,174,14:54:00.0000
ADC is Quanterra Model Q-330 from 2004,174,14:54:00.0000 to present

DIGITAL FORMAT:
24 bit integer data words for all broadband (20 sps), long period (1 sps) and
triggered (80 sps).
From 1999,056,21:00:00.0000 to 2004,174,14:54:00.0000

24 bit integer data words for all broadband (100, 40 sps), long period (1 sps).
From 2004,174,14:54:00.0000 to present
Range: +8,388,607 to -8,388,608 counts.

EVENT DETECTOR ALGORITHM:  
The Murdock event detector (Murdock, 1991) is used for all short period channels.
From 2004,174,14:54:00.0000 on, the data is recorded continuously.

Click on any of the following items for further information.

• Channel Data
• H Channel Amplitude Response to Ground Velocity
• Pole-Zero Response in IRIS DMC Format
• Seismic Noise Study graph information
  • Seismic Noise Level - June 15, 1998
• Channel response history from SEED RESPONSE files

COMMENTS:
The three minute long, every 15 minutes or so noise is caused by a
large air compressor in the building attic.