B088 skyoks088bcs200 Latitude 33.37495 Longitude -116.62052 Elevation 1404 m Install Date 2007-01-27 Contents Of Tar files for year YYYY File Contents B088.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B088.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B088.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B088.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B088.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B088.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B088.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B088.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B088.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B088.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 = 216.2 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 -128.936 93.534 -0.00171 -0.02355 0.000 0.00000 CH1 -132.875 110.030 -0.00170 -0.03022 0.000 0.00000 CH2 0.380 -9.859 0.00055 0.00119 0.000 0.00000 CH3 -8.600 8.933 -0.00379 -0.00099 0.000 -0.00000 Detrend reference date 2007-01-27T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -1.1 CH1 -2.6 CH2 -3.2 CH3 -2.1 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 5.802 20.992 CH0 O1 28.015 8.619 CH0 P1 22.731 3.415 CH0 K1 34.997 9.589 CH0 N2 -2.926 3.497 CH0 S2 12.102 11.745 CH1 M2 -5.598 14.428 CH1 O1 -11.639 4.548 CH1 P1 -18.785 1.891 CH1 K1 -4.543 5.563 CH1 N2 -3.421 3.270 CH1 S2 -0.689 6.582 CH2 M2 165.434 7.139 CH2 O1 -76.357 1.678 CH2 P1 -96.515 1.094 CH2 K1 -76.945 2.484 CH2 N2 158.199 1.598 CH2 S2 168.508 4.402 CH3 M2 148.089 4.532 CH3 O1 68.770 1.132 CH3 P1 170.217 0.270 CH3 K1 81.923 1.235 CH3 N2 164.247 1.286 CH3 S2 135.819 2.788 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 = 216.2 ISOTROPIC 0.29629682 0.51851799 0.29629614 0.22222238 ISOTROPIC -0.23428492 -0.24974042 0.33418031 0.14984504 ISOTROPIC 0.31423878 -0.27350363 -0.20483703 0.16410189 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.638 1.204 1.381 0.219 KH2013 0.042 0.386 1.322 0.437 KH2013 0.349 -0.479 0.706 0.728 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