B926 cowich926bbc2007 Latitude 48.8202 Longitude -124.1312 Elevation 191.6 m Install Date 2007-11-12 Contents Of Tar files for year YYYY File Contents B926.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B926.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B926.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B926.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B926.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B926.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B926.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B926.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B926.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B926.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 = 236.4 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 -63.850 73.363 -0.00153 -0.01377 0.000 0.00000 CH1 -55.430 64.817 -0.00167 -0.02207 0.000 0.00000 CH2 -31.430 -203.440 -0.02940 -0.03650 87.426 -0.00400 CH3 -94.850 86.776 -0.00119 -0.01813 0.000 -0.00000 Detrend reference date 2007-11-12T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -2.9 CH1 -3.2 CH2 0.0 CH3 -2.7 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 -14.023 15.617 CH0 O1 -87.238 3.928 CH0 P1 -141.700 1.746 CH0 K1 -128.621 5.859 CH0 N2 22.787 2.627 CH0 S2 -56.072 6.138 CH1 M2 -124.826 0.575 CH1 O1 133.052 2.564 CH1 P1 130.047 1.582 CH1 K1 132.232 4.359 CH1 N2 -89.838 1.294 CH1 S2 42.686 3.340 CH2 M2 0.000 0.000 CH2 O1 0.000 0.000 CH2 P1 0.000 0.000 CH2 K1 0.000 0.000 CH2 N2 0.000 0.000 CH2 S2 0.000 0.000 CH3 M2 1.951 11.222 CH3 O1 -24.657 7.780 CH3 P1 -21.131 2.669 CH3 K1 -29.211 8.154 CH3 N2 37.233 2.633 CH3 S2 -50.350 2.931 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 = 236.4 ISOTROPIC 0.00000000 0.66666667 0.00000000 0.66666667 ISOTROPIC -0.09648157 -0.30658451 0.00000000 0.40306608 ISOTROPIC 0.76373025 -0.23271031 0.00000000 -0.53101995 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.742 1.32 0.911 0.646 KH2013 -0.039 -1.01 -0.28 0.235 KH2013 0.656 0.315 -0.308 0.204 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