Features: Low Power 24-bit ADC: powered from two "D" cell batteries Small, Lightweight, and Sealed Aluminum Case Solid-state Data Storage Time Base Stability 0.1 ppm: GPS synchronization Industry Standard Hi-Speed (480Mbit) USB2.0 Interface Applications: Active Source Crustal Studies Refraction Active Source Crustal Studies Reflection Exploration 3-D Noise Testing and Tomographic Arrays Aftershock Studies Micro-Zonation Survey

The 125A Miniature Seismic Recorder (Texan) is an important advancement in the seismology industry. The Texan's self-contained, compact design allows greater flexibility and the ability to easily integrate into system operations.

In crustal scale refraction experiments, hundreds of instruments are deployed over several hundred kilometers for two to four days duration. Recordings are made based on pre-set time windows at a rate of 100 samples per second (sps). Because explosions are typically being recorded, a maximum of 50 time windows of 120-second duration will also be recorded. The Texan's data storage requirement for this application is about 2 MB. Timing accuracy for the four day period must be within -/+5 msec relative to the shot time.

For crustal scale reflection experiments, instruments are deployed for three to five days with six to eight hour continuous recordings using a vibrator energy source. After each day's recording, data is downloaded, and the Texan is initialized for the next day's recording. Because the data may be stacked, time accuracy must be within ���2 msec. Time accuracy must be within ���2 msec since the data may be stacked.

Links to Lithosphere experiments conducted with REF TEK Texans:

Alps 2002 International Seismic Experiment www.alp2002.info/experiment.htm
IRIS Deployment in California, 2000 www.passcal.nmt.edu/%7ebob/passcal/superhills
IRIS Deplyment at Hill AFB, UTA, 2002 www.passcal.nmt.edu/%7ebob/passcal/hillafb
IRIS Deployment in New Zealand, 2001 www.passcal.nmt.edu/%7Ealvarez/Work/NZ2001
IRIS Deployment in Venezuela, 2001 www.passcal.nmt.edu/%7ebob/passcal/venezuela