B934 legget934bcn2008 Latitude 39.8445 Longitude -123.6914 Elevation 331 m Install Date 2008-09-26 Contents Of Tar files for year YYYY File Contents B934.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B934.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B934.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B934.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B934.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B934.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B934.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B934.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B934.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B934.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 = 319 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 -200.000 0.000 0.00000 0.00000 0.000 0.00000 CH1 -200.000 0.000 0.00000 0.00000 0.000 0.00000 CH2 -200.000 0.000 0.00000 0.00000 0.000 0.00000 CH3 -200.000 0.000 0.00000 0.00000 0.000 0.00000 Detrend reference date /detrend_ref Barometric Response Gauge Response(ns/millibar) CH0 -2.8 CH1 -10.6 CH2 -4.3 CH3 -3.8 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 13.693 5.006 CH0 O1 -30.984 2.325 CH0 P1 -21.153 0.485 CH0 K1 -17.358 2.249 CH0 N2 14.024 1.294 CH0 S2 49.013 2.426 CH1 M2 21.812 14.785 CH1 O1 -26.884 11.863 CH1 P1 -32.297 3.896 CH1 K1 -39.373 11.711 CH1 N2 56.065 2.877 CH1 S2 7.659 2.667 CH2 M2 -19.537 9.822 CH2 O1 39.074 5.014 CH2 P1 54.340 2.056 CH2 K1 53.018 6.076 CH2 N2 -35.370 2.104 CH2 S2 8.191 5.404 CH3 M2 -46.813 2.778 CH3 O1 103.021 1.096 CH3 P1 119.970 0.746 CH3 K1 92.595 2.184 CH3 N2 -46.103 0.945 CH3 S2 42.256 1.496 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 = 319 ISOTROPIC 0.29629665 0.51851826 0.29629626 0.22222216 ISOTROPIC 0.07550899 0.34340041 -0.21286844 -0.20604097 ISOTROPIC -0.38462136 0.13874601 0.32912234 -0.08324699 Hodgkinson et al. (2013) Tidal Calibration KH2013 1.324 0.836 0.297 0.326 KH2013 0.935 0.308 -0.685 0.003 KH2013 -0.751 0.187 0.177 -0.208 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