B073 varian073bcs2006 Latitude 35.9467 Longitude -120.4717 Elevation 535.3 m Install Date 2006-10-18 Contents Of Tar files for year YYYY File Contents B073.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B073.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B073.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B073.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B073.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B073.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B073.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B073.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B073.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B073.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 = 270.1 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 -37.140 0.000 0.00000 -0.00089 35.158 -0.00130 CH1 189.540 -117.200 -0.00105 0.01840 -74.800 -0.01053 CH2 -199.888 137.020 -0.00221 -0.06033 10.708 0.00052 CH3 -170.908 109.960 -0.00230 -0.05640 14.791 0.00047 Detrend reference date 2006-10-18T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -12.0 CH1 -10.0 CH2 -7.9 CH3 -7.6 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 -172.163 10.679 CH0 O1 -167.318 2.925 CH0 P1 -175.695 1.056 CH0 K1 -160.382 2.704 CH0 N2 179.368 1.958 CH0 S2 -175.747 6.275 CH1 M2 -148.679 7.809 CH1 O1 143.932 4.237 CH1 P1 139.121 1.976 CH1 K1 140.482 5.156 CH1 N2 -144.761 1.825 CH1 S2 -167.968 3.057 CH2 M2 109.445 1.133 CH2 O1 -161.871 2.992 CH2 P1 -169.262 0.921 CH2 K1 -160.883 2.624 CH2 N2 9.367 0.347 CH2 S2 104.976 1.799 CH3 M2 151.372 2.959 CH3 O1 -135.281 2.413 CH3 P1 -127.049 0.682 CH3 K1 -118.362 2.351 CH3 N2 106.439 0.452 CH3 S2 152.039 2.334 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 = 270.1 ISOTROPIC 0.29629699 0.51851820 0.29629592 0.22222222 ISOTROPIC 0.37081499 -0.18406666 -0.29718805 0.11043972 ISOTROPIC 0.12700876 0.32139321 -0.25556544 -0.19283653 Roeloffs 2010 Tidal Calibration Calculated CH0 orientation = 273.3 degrees east of north ER2010 -0.88182914 -0.81225113 -0.57421371 -0.60171802 ER2010 0.47546729 -0.31102462 -0.63122543 -0.04953135 ER2010 0.16962093 0.42674938 -0.62218982 -0.47306098 Reference: Roeloffs, E. (2010), Tidal calibration of Plate Boundary Observatory borehole strainmeters: Roles of vertical and shear coupling, J. Geophys. Res., 115, B06405, doi:10.1029/2009JB006407. Hodgkinson et al. (2013) Tidal Calibration KH2013 -0.762 -1.07 -1.169 -0.711 KH2013 0.482 -0.366 -0.613 -0.032 KH2013 0.188 0.424 -0.677 -0.47 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