B901 indspr901bcn2007 Latitude 35.69 Longitude -120.142 Elevation 275.3 m Install Date 2007-09-26 Contents Of Tar files for year YYYY File Contents B901.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B901.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B901.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B901.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B901.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B901.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B901.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B901.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B901.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B901.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 = 215.5 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 3.580 26.874 -0.00068 -0.02580 -0.000 0.00000 CH1 -93.970 0.000 0.00000 -0.00954 120.050 -0.00158 CH2 72.640 -83.486 -0.00317 -0.01365 -0.000 0.00000 CH3 9.970 -0.000 0.00000 -0.01257 0.000 0.00000 Detrend reference date 2007-09-26T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -8.4 CH1 -6.1 CH2 -7.0 CH3 -7.7 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 -34.596 1.096 CH0 O1 158.503 3.548 CH0 P1 160.691 1.518 CH0 K1 154.060 3.065 CH0 N2 -70.712 0.680 CH0 S2 37.141 1.808 CH1 M2 38.855 6.775 CH1 O1 -43.611 4.164 CH1 P1 -58.674 1.816 CH1 K1 -35.381 6.605 CH1 N2 40.183 1.711 CH1 S2 44.106 2.269 CH2 M2 -145.724 4.628 CH2 O1 49.481 1.801 CH2 P1 124.736 0.299 CH2 K1 22.644 2.800 CH2 N2 -164.339 1.144 CH2 S2 -138.971 2.528 CH3 M2 -125.174 4.341 CH3 O1 118.772 3.213 CH3 P1 133.291 1.487 CH3 K1 110.873 2.979 CH3 N2 -130.204 1.314 CH3 S2 -105.605 0.971 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 = 215.5 ISOTROPIC 0.29629684 0.51851796 0.29629614 0.22222240 ISOTROPIC -0.24189206 -0.24298338 0.33908463 0.14579081 ISOTROPIC 0.30842099 -0.27952348 -0.19661134 0.16771382 Hodgkinson et al. (2013) Tidal Calibration KH2013 -3.869 7.617 -3.335 10.955 KH2013 -0.279 -0.368 0.481 -0.686 KH2013 -0.691 0.516 0.097 1.635 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