B917 tonyso917bcs2008 Latitude 35.4053 Longitude -117.2588 Elevation 1192 m Install Date 2008-07-14 Contents Of Tar files for year YYYY File Contents B917.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B917.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B917.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B917.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B917.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B917.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B917.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B917.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B917.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B917.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 = 306.1 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 -148.216 103.590 -0.00080 0.00528 0.000 0.00000 CH1 -142.898 158.760 -0.00220 -0.02120 0.000 0.00000 CH2 -2.950 -68.149 -0.00148 -0.04110 72.152 0.00028 CH3 8.490 -60.614 -0.00338 0.00289 0.000 0.00000 Detrend reference date 2008-07-14T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -3.9 CH1 -3.7 CH2 -2.8 CH3 -3.1 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 29.026 5.171 CH0 O1 -55.141 2.889 CH0 P1 -17.813 1.430 CH0 K1 -50.892 3.912 CH0 N2 26.440 1.489 CH0 S2 36.938 1.661 CH1 M2 -25.093 5.048 CH1 O1 14.637 9.515 CH1 P1 22.849 4.540 CH1 K1 18.186 10.533 CH1 N2 -42.298 0.720 CH1 S2 -23.758 2.576 CH2 M2 9.825 4.190 CH2 O1 156.183 1.681 CH2 P1 126.319 1.130 CH2 K1 159.443 2.881 CH2 N2 -2.652 0.659 CH2 S2 23.597 2.485 CH3 M2 17.097 9.269 CH3 O1 -74.340 2.050 CH3 P1 -16.648 0.716 CH3 K1 -88.966 2.493 CH3 N2 16.878 2.053 CH3 S2 21.888 4.061 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 = 306.1 ISOTROPIC 0.29629715 0.51851773 0.29629601 0.22222246 ISOTROPIC 0.23538071 0.24878299 -0.33489319 -0.14927052 ISOTROPIC -0.31341808 0.27437388 0.20366853 -0.16462432 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.476 1.143 0.503 1.028 KH2013 0.18 0.078 -0.615 -0.418 KH2013 -0.496 0.196 0.131 -0.38 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