My datalogging systems are currently monitoring 1 USGS telemetry sensor and 5 sensors located at my house in Redwood City California. The file name extensions corresponds to the following sensor:Channels in bold are currently online as of 11/2006.*.lc1 Long period (~14 seconds) homemade Lehman. This sensor is oriented North-South. *.lc2 Short period commercial vertical sensor. This sensor went offline 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. *.lc6 +-2G ADXL05 Strong Motion Accelerometer Sensor. Currently oriented N-S. Went online 3/97 and offline 2/99. *.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.This channel went offline 2/2001. This channel is now back online as of 4/2001. *.lc9 GeoSpace HS-10-1 1 Hz vertical Geophone. This sensor went online 9/99. 3/2000 - Gain between the sensor and the A/D card = 250. This sensor is currently offline. *.lcs New PSN strong motion sensor. Online 11/99, offline 2/2000. This channel is currently offline. *.lcref Test Channel. Currently (11/2006) this channel is connected to a 4.5 Hz vertical The following channels went online 6/1997 *.lcel +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A). This is a horizontal channel oriented E-W. Starting 8/2001 this channel is now named LCEL was LC4 *.lcnl +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A). This is a horizontal channel oriented N-S. Starting 8/2001 this channel is now named LCNL was LC5 *.lczl +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A), vertical channel. Starting 8/2001 this channel is now named LCZL was LC7 The following channels went online 3/2000 *.lceh +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A) high gain (G=200) channel. Oriented E-W. Full scale output = +-10 mg. Starting 8/2001 this channel is now named LCEH was LCE. *.lcnh +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A) high gain (G=200) channel. Oriented N-S. Full scale output = +-10 mg. Starting 8/2001 this channel is now named LCNH was LCN. *.lczh +-2G Forced-Balance Accelerometer (Kinemetrics FBA-23A) high gain (G=200) channel. Vertical Orientation. Full scale output = +-10 mg. Starting 8/2001 this channel is now named LCZH was LCZ. The following channels went online 2/2001 and offline 5/2002 *.rwn N-S component 4.5HZ Mark Products L-15B Geophone. Gain between the A/D card and sensor = 250. *.rwe E-W component 4.5HZ Mark Products L-15B Geophone. Gain between the A/D card and sensor = 250. *.rwz Vertical component 4.5HZ Mark Products L-15B Geophone. Gain between the A/D card and sensor = 250. The following channels went online 11/2001 and offline 02/2003 *.lcanh N-S component PSN-ACCEL accelerometer sensor board. High gain output. *.lcaeh E-W component PSN-ACCEL accelerometer sensor board. High gain output. *.lcazh Vertical component PSN-ACCEL accelerometer sensor board. High gain output. The following channel went online 07/2003 *.lcsv1 Kinemetrics SV-1 5-Second Intermediate Period vertical sensor. Amplifier gain = 200. The following channels went online 06/2006 *.lctst VolksMeter raw channel. This sensor is similar to the Shackleford-Gundersen LC8 channel. *.lctst1 VolksMeter integrated channel.
The following sensors are USGS high gain vertical sensors received using radio telemetry. *.cmm Located at Mount Mocho 37.45N 121.49W *.cni Located at Niles Canyon 37.607N 121.964W (curently offline) *.cgp Located near Hayward 37.64N 122.00W (currently offline) *.csz Located at San Leandro 37.724N 122.119W (currently offline) *.jsb Located at San Bruno Mountain 37.68N 122.40W (currently offline) *.jsa Located near Crystal Springs Reservoir 37.58N 122.41W (currently offline) *.jcp Located at Coyote Point in San Mateo 37.59N 122.32W (currently offline)
Photo of the sensor.Changes made 12/16/2002:The Amplifier/Filter boards have been changed to my 4-Channel Amp/Filter board. The low gain channels still have a gain of 1 and the high gain channels 200. All six channels have a 20 Hz 8-Pole low-pass filter and a 60 second 1-Pole high-pass filter.Calibration: The sensor was calibrated at Kinemetrics on 1/30/99. All recording channels (*.LCEL, *.LCNL, *.LCZL) 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 *.LCEL +- 1.996 g .06091 mg N-S *.LCNL +- 2.004 g .06115 mg Z *.LCZL +- 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 ButterworthHigh Gain Channels: Starting 3/2000 I added 3 more channels from the FBA. These channels (*.LCEH, *.LCNH and *LCZH) go through one of my 3 channel Amp/Filter boards. Each channel has the following characteristics: Gain: 200 High-Pass: 1-order .031 Hz (32 second) Low-Pass: 7 pole 20 Hz Sensitivity: +- .01g full scale (+- 32768 A/D counts) or .304ug (.2981 cm/sec/sec) per bit.See note above regarding new filter settings.
Starting 8/2001 the following sensor names have been changed:
Old New Channel
*.LC4 *.LCEL Low gain E-W Kinemetrics FBA-23A
*.LC5 *.LCNL Low gain N-S Kinemetrics FBA-23A
*.LC7 *.LCZL Low gain Z Kinemetrics FBA-23A
*.LCE *.LCEH High gain E-W Kinemetrics FBA-23A
*.LCN *.LCNH High gain N-S Kinemetrics FBA-23A
*.LCZ *.LCZH High gain Z Kinemetrics FBA-23A
Also starting around 8/2001 all new event files now end in .PSN
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