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Tim Ahern

Explore the FDSN and IRIS GSN networks, PASSCAL equipment inventory, real-time data transmission, and seismic studies of the lithosphere. Get training, documentation, and field support for seismic experiments.

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Tim Ahern

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  1. The FDSN and IRIS GSN and PASSCAL “Networks” Tim Ahern

  2. FDSN Archive for Continuous Data at the IRIS DMC • FDSN Backbone Network • 200 stations currently • Plans to increase in size to 300 • Southern Hemisphere is underrepresented

  3. FDSN Network201 stations

  4. 1,495 Stations in Central and S. America 291 Permanent, 625 PASSCAL, 170 SEIS-UK, 75 OBSIP 60 stations have real time telemetry

  5. 60 Stations come in real time to the IRIS DMC (not including TA, IM, etc)

  6. The IRIS Global Seismographic Network 156 Broadband Stations

  7. The composition of the IRIS GSN • GSN • 156 Broadband stations • 81 IRIS/USGS (IU) Stations • 41 IRIS/IDA (II) Stations • 10 IRIS/China (IC) Stations • 9 USGS Caribbean (CU) Stations • 9 AFTAC/IMS (IM) Stations • 6 Affiliate Stations (AU, BK, CI, GT, MS)

  8. The Bandwidth of State-of-the-Art Instrumentation

  9. Real Time Data Transmission nearly realized

  10. Geophysical Observatories

  11. Working Closely with the CTBTO/IMS

  12. Upgrading the GSN Data Loggers

  13. Program for Array Seismic Studies of the Continental Lithosphere5,716 PASSCAL Stations in 672 Experiments

  14. PASSCAL Equipment Inventory 6,775 channels of data acquisition

  15. Types of Equipment Supported by PASSCAL • Data Loggers • 468 - RT130 • 491 - Q330 • Broadband Sensors • 220 - Streckheisen STS-2 • 560 - Guralp CMG-3T • 42 - Nanometrics Trillium 240 • 2 - Nanometrics Trillium 120 • Intermediate Period Sensors • 90 Guralp 40T • 16 Nanometrics T-40 • Short period sensors • 100 Guralp 40T (1 sec) • 170 Sercel L22 (2hz)

  16. Experiment Support

  17. Training, Docs & Web • All PIC Experiments Required to Attend Training • 2-3 day intensive covering all aspects of deployment, data recovery, and archiving • Training continues in-field for all experiments that have PIC personnel field support • Documentation • Documentation frequently tailored to experiment. • Examples of field deployment and service sheets • http://www.passcal.nmt.edu • Access to PIC inventory • Instrument specifications and comparisons • Request forms and policies • Instrument schedules • Experiment profiles • Software links

  18. Field Himalayan Seismotectonics, Nepal • Huddle Test • Access equipment health • Test recording parameters • Training • Provide in-field training for all participants • Review best practices • Logistics • Controlled Source • Start to finish • Deploy and/or man field center during deployment • Produce field archive of raw data • Create gathers if time permits • Passive Source • Deploy at least during the initial phase for continued training and best practice

  19. Data Archiving

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