B039 cofflt039bcn2007 Latitude 41.4667 Longitude -122.4847 Elevation 923.9 m Install Date 2007-10-15 Contents Of Tar files for year YYYY File Contents B039.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B039.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B039.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B039.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B039.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B039.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B039.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B039.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B039.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B039.YYYY.xml.2Ene.ER2010.txt.gz Processed engineering shear strain, Roeloffs [2010], calibration Description of Level 2 Borehole Strainmeter ASCII files. Column 1 Description of data, gauge0, gauge1 etc Column 2 Date, YYYY-MM-DDTHH:mm:ss Column 3 Day of year Column 4 Modified Julian Date Column 5 Strain (microstrain). No offsets, trends, tides or barometric corrections have been applied. Column 6 Running sum of offsets Column 7 Strain data quality flag (g=good, b=bad, m=missing) Column 8 Tidal correction (microstrain) Column 9 Borehole trend correction (microstrain) Column 10 Barometric pressure correction (microstrain) Column 11 Barometric pressure data quality flag (g=good, b=bad, m=missing, i=interpolated) Column 12 Level, quality (2a= rapid processing, 2b=post processed) Column 13 Version, data generation date Column 14 Barometeric pressure (millibars) To produce strain data with offsets, tides, trends, tides and barometric pressure effect removed use Final_Strain=Column5+Column6-Column8-Column9-Column10 Processing Information Manufacturer: GTSM Technologies Manufacturer Gauge Scale Factor: 0.05 nanostrain per digital count Manufacturer Areal Scale Factor: 1.5 Manufacturer Shear Scale Factor: 3.0 Manufacturer Gauge Weightings: CH0=1, CH1=1, CH2=1, CH3=1 CH0 Orientation recorded in field = 331 degrees east of north Borehole Trend Models, calculated in days, y=F+A1*exp(T1*t)+M*t+A2*exp(T2*t) Gauge F A1 T1 M A2 T2 CH0 -41.250 55.274 -0.00102 -0.00621 0.000 0.00000 CH1 -25.400 39.229 -0.00070 -0.01396 0.000 0.00000 CH2 7.930 -83.878 -0.00517 0.04805 0.000 0.00000 CH3 -64.920 84.155 -0.00089 -0.00986 0.000 0.00000 Detrend reference date 2007-10-15T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -2.8 CH1 -2.7 CH2 -2.8 CH3 -2.8 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 3.809 8.637 CH0 O1 49.267 2.444 CH0 P1 76.058 1.911 CH0 K1 73.090 2.715 CH0 N2 -12.054 1.875 CH0 S2 21.943 5.277 CH1 M2 40.394 12.330 CH1 O1 -39.798 6.665 CH1 P1 -16.192 2.206 CH1 K1 -55.591 7.495 CH1 N2 53.439 2.796 CH1 S2 43.782 3.270 CH2 M2 -94.486 6.536 CH2 O1 34.673 6.978 CH2 P1 47.806 3.357 CH2 K1 39.136 7.639 CH2 N2 -109.194 1.462 CH2 S2 -93.813 3.492 CH3 M2 -67.289 5.781 CH3 O1 60.498 4.943 CH3 P1 72.932 3.412 CH3 K1 70.370 6.157 CH3 N2 -73.329 1.695 CH3 S2 -25.124 2.545 Strain Matrices To Compute Areal and Shear Strain from Gauge Strain Manufacturer's Isotropic Strain Matrix, C=1.5, D=3.0, Gauge Weights=1, Orientation = 331 ISOTROPIC 0.29629665 0.51851779 0.29629648 0.22222241 ISOTROPIC -0.08745871 0.37014456 -0.06059865 -0.22208720 ISOTROPIC -0.38208148 -0.01292209 0.38724935 0.00775423 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.878 1.185 0.693 0.481 KH2013 -0.327 0.305 0.203 -0.198 KH2013 -0.231 -0.358 0.421 0.182 Reference: Table 2. Hodgkinson, K., J. Langbein, B. Henderson, D. Mencin, and A. Borsa (2013), Tidal calibration of plate boundary observatory borehole strainmeters, J. Geophys. Res. Solid Earth, 118, 447–458, doi:10.1029/2012JB009651. Wed Dec 27 11:27:32 UTC-06:00 2023