B941 kapows941bwa2008 Latitude 46.9868 Longitude -122.219 Elevation 151 m Install Date 2008-03-18 Contents Of Tar files for year YYYY File Contents B941.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B941.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B941.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B941.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B941.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B941.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B941.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B941.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B941.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B941.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 = 281.3 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 -42.000 31.634 -0.00108 -0.00790 0.000 0.00000 CH1 -74.810 59.598 -0.00173 -0.01137 0.000 0.00000 CH2 -68.840 60.358 -0.00090 -0.00940 0.000 0.00000 CH3 -55.900 50.064 -0.00138 -0.01332 0.000 0.00000 Detrend reference date 2008-03-18T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -5.3 CH1 -4.2 CH2 -5.8 CH3 -7.3 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 -26.274 6.506 CH0 O1 61.379 5.890 CH0 P1 62.385 2.571 CH0 K1 54.286 8.504 CH0 N2 -48.966 0.757 CH0 S2 -31.270 3.320 CH1 M2 -173.994 5.044 CH1 O1 -100.095 2.447 CH1 P1 -158.671 1.141 CH1 K1 -162.316 3.502 CH1 N2 -85.599 1.483 CH1 S2 88.579 4.938 CH2 M2 14.065 11.206 CH2 O1 -14.099 6.952 CH2 P1 -15.956 2.381 CH2 K1 -15.693 7.579 CH2 N2 45.683 2.350 CH2 S2 -15.685 2.581 CH3 M2 -2.531 9.309 CH3 O1 40.068 5.460 CH3 P1 36.379 2.171 CH3 K1 32.322 7.704 CH3 N2 44.631 1.198 CH3 S2 -47.702 3.543 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 = 281.3 ISOTROPIC 0.29629671 0.51851813 0.29629613 0.22222237 ISOTROPIC 0.39123484 -0.04770468 -0.37215226 0.02862211 ISOTROPIC -0.02388142 0.36728547 -0.12303250 -0.22037155 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.529 0.947 1.258 0.338 KH2013 -0.773 -1.108 0.513 0.194 KH2013 0.679 0.186 -0.173 0.26 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