Station / Sensor Information

This system is currently monitoring 2 USGS telemetry sensors and 5 sensors 
located at my house. The file name extensions corresponds to the following 
sensor:
  
The following sensors are located at my house in Redwood City California. 
  *.lc1   Long period (~14 seconds) homemade Lehman. This sensor is 
          oriented North-South.
  *.lc2   Short period commercial vertical sensor. This sensor went off line
          3/10/97 do to sensor failure. A new sensor was placed online 4/15/99 
          using this ID. This sensor was a L28 4.5HZ vertical short period unit.
          Starting 3/2000 this channel ID is being used with a new test sensor.
          The sensor is a vertical FBA. This channel is the integrated so the 
          output is velocity channel.
  *.lc3   Long period (~60 seconds) homemade Shackleford-Gundersen 
          horizontal sensor based on the Sept. 1975 Scientific American 
          article. This sensor is oriented North-South and went online 11/95. 
  *.lc4   +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A). This is
          a horizontal channel oriented E-W. Went online 2/99.
  *.lc5   +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A). This is
          a horizontal channel oriented N-S. Went online 3/97.
  *.lc6   +-2G ADXL05 Strong Motion Accelerometer Sensor. Currently oriented
          N-S. Went online 3/97 and offline 2/99.
  *.lc7   +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A), vertical 
          channel. Went online 6/97.
  *.lc8   Short period channel of *.lc3. Homemade Shackleford-Gundersen 
          horizontal sensor based on the Sept. 1975 Scientific American 
          article. This sensor is oriented North-South and went online 09/97.
  *.lc9   GeoSpace HS-10-1 1 Hz vertical sensors. This sensor went on line 9/99.
          3/2000 - Gain between the sensor and the A/D card = 250.
  *.lcs   New PSN strong motion sensor. Online 11/99, offline 2/2000.
    
                   The following channels went online 3/2000
  *.lce   +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A) high gain 
          (G=200) channel. Oriented E-W. Full scale output = +-10 mg.
  *.lcn   +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A) high gain 
          (G=200) channel. Oriented N-S. Full scale output = +-10 mg.
  *.lcz   +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A) high gain 
          (G=200) channel. Vertical Orientation. Full scale output = +-10 mg.
  *.lct   Same as *.lc2 except the output is acceleration.

The following sensors are USGS high gain vertical sensors received 
using radio telemetry.
  
  *.cni   Located at Niles Canyon 37.607N 121.964W  
  *.cgp   Located near Hayward 37.64N 122.00W
  *.csz   Located at San Leandro 37.724N 122.119W (currently off line)
  *.jsb   Located at San Bruno Mountain 37.68N 122.40W  (currently off line)
  *.jsa   Located near Crystal Springs Reservoir 37.58N 122.41W  (currently off line)
  *.jcp   Located at Coyote Point in San Mateo 37.59N 122.32W  (currently off line)
  *.cmm   Located at Mount Mocho 37.45N 121.49W  (currently off line)

The following sensor is a USGS medium gain horizontal also received using 
radio telemetry.
  
  *.csl   Located at San Leandro 37.724N 122.119W (currently off line)
  
More about the Kinemetrics FBA-23A channels:

 Calibration:
  
  The sensor was calibrated at Kinemetrics on 1/30/99. All recording channels
  (*.LC4, *.LC5, *.LC7) are set for a maximum output (+- 32768 A/D counts) of 
  +-2 g's. Each A/D channel's gain was measured to determine the actual 
  sensitivity.
  
     Component  Files    Maximum Output   Sensitivity Per Bit
        E-W     *.LC4     +- 1.996 g          .06091 mg
        N-S     *.LC5     +- 2.004 g          .06115 mg  
         Z      *.LC7     +- 1.992 g          .06079 mg 

 Filtering:
   
  Each channel has the same high and low pass filtering.
  
  High-Pass: 1-pole  .072 Hz (13.8 second) Butterworth
  Low-Pass:  6-pole  20 Hz Butterworth
   
 High Gain Channels:
  
  Starting 3/2000 I added 3 more channels from the FBA. These channels 
  (*.lce, *.lcn and *lcz) go through one of my 3 channel Amp/Filter 
  boards. Each channel has the following characteristics:
  
  Gain:      200
  High-Pass: 1-pole  .031 Hz (32 second) Butterworth
  Low-Pass:  7-pole  20 Hz Butterworth
  
  Sensitivity:  +- .01g full scale (+- 32768 A/D counts) or.305ug per bit.