Ground Systems
 

QF-1007 System

QuakeFinder have 60+ sensor locations currently operating. These are made up of a series of design models, with each model improved in some way over the previous model.

    Model:
    1.High School (2000). 3 hand built magnetometers, approx. 12 in. long, with frequency response from 0.3 Hz to 4 Hz (low pass filtered, -100 db at 60 Hz). Time synched to GPS via network once per day; Root Mean Square summary data downloaded via phone lines (19kbps) once per day; raw data retrieved manually each 90 days via disc swap; (no air conductivity or geophone)
    2.QF-1000 (2001). Same as High school, but electronics in above ground enclosure.
    3.QF-1003 (2003). NASA-funded unit with same magnetometers, but with imbedded GPS timing system, air conductivity sensor, and Globalstar satellite-based 19kbps phone line for RMS file delivery once per day.
    4.QF-1005 (2005). New design using Zonge Eng. tri-axial Ant 4 magnetometers, plus GPS timing system, 4 Hz geophone, air conductivity sensor, relative humidity sensor, and WildBlue satellite-based Internet data delivery for 30MB raw data files once per day (typically between 1AM and 3 AM each day)
    5.QF-1007 (2007). Similar hardware design to QF-1005, but Linux-based software, same sensor suite and magnetometers, and WildBlue or DSL Internet (see specs below for QF-1007)
3 axis magnetometers
  • Frequency range: 0.001 Hz to 12 Hz (analog low pass filter with cutoff at 12 Hz, 100db attenuation at 60 Hz)
  • Sensitivity: 0.3nT at 0.001 Hz; 1 pT at 0.1 Hz; 0.02pT at 12 Hz
  • Sampled at 50 sps, with disc storage for 2+ years local data storage
  • 24 bit sigma delta A/D, 8 channels
Air conductivity sensor
  • Two 15 cm x 15 cm plates with 50 volt DC differential voltage to measure any charged particles in the local atmosphere
  • Also includes a relative humidity sensor to collect and store relative humidity.
    • When RH is greater than 95%, the air conductivity frequently is contaminated by water condensing on the sensor plates (Air Conductivity data may not be valid)
Geophone
  • 4 Hz geophone to help discriminate ground motion (and coil motion) from EM signals
GPS
  • GPS timing to synchronize multiple sites data so that adjacent sites can be subtracted for common mode noise reduction
Power
  • Battery operation (charged continuously from commercial power)
  • Single 120VAC to 12VDC power supply in enclosed case with temperature sensor and 100 AmpHr Sealed battery.
  • Operates for 2-3 days if power is interrupted.
Options for data extraction:
  • WildBlue satellite-based Internet, or local (DSL) Internet (100,000+ baud uplinks)
    • Utilizes 2.4GHz WIFi Ethernet Bridge to WIFi router link to deliver data from site to nearby home.
      • 100m range
    • Raw Data File segments sent every hour. Files average 30-50MB per day for raw data
    • "Heartbeat" Files (Voltages, temperatures, latest IP address) sent every 5 sec.
  • Manual disc extraction after a quake if necessary
The Portable ULF Magnetometer

Portable Includes: Zonge ANT 4 ULF magnetometer with preamp Power Supplies (with battery) Amplifier and Low Pass Filter (12 Hz) with Electronics, Case, and Cables Calibration data base

Options Include:

  1. This is a single axis ANT4 magnetometer
  2. VPortable power supply, amplifier, and analog low pass filter (12 Hz cutoff).
  3. Includes readout is via digital hand-held oscilloscope (Velleman HS-10)
  4. Used to perform site surveys and to identify potential ULF noise sources prior to permanent installation of a QF-1007 unit.
 
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