B201 coldwt201bwa2007 Latitude 46.3033 Longitude -122.2648 Elevation 990 m Install Date 2007-09-12 Contents Of Tar files for year YYYY File Contents B201.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B201.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B201.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B201.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B201.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B201.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B201.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B201.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B201.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B201.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 = 18 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 -54.750 0.000 0.00000 -0.02721 33.219 -0.00168 CH1 -38.230 0.000 0.00000 -0.03023 32.115 -0.00490 CH2 -98.580 0.000 0.00000 -0.03268 63.263 -0.00477 CH3 -46.670 0.000 0.00000 -0.03135 42.414 -0.00449 Detrend reference date 2007-09-12T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -6.9 CH1 -7.1 CH2 -5.5 CH3 -4.2 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 -150.429 7.711 CH0 O1 118.520 3.871 CH0 P1 101.227 2.131 CH0 K1 105.157 5.678 CH0 N2 -113.894 2.357 CH0 S2 77.701 1.808 CH1 M2 83.137 5.707 CH1 O1 -107.221 4.096 CH1 P1 -98.950 1.595 CH1 K1 -106.542 5.872 CH1 N2 79.431 1.590 CH1 S2 110.589 2.336 CH2 M2 -17.188 11.845 CH2 O1 8.134 7.690 CH2 P1 9.778 3.175 CH2 K1 6.210 8.483 CH2 N2 7.288 1.701 CH2 S2 -43.752 5.356 CH3 M2 -60.380 7.545 CH3 O1 41.977 6.383 CH3 P1 44.283 2.968 CH3 K1 46.081 8.016 CH3 N2 -72.742 1.795 CH3 S2 -35.603 3.953 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 = 18 ISOTROPIC 0.29629673 0.51851780 0.29629642 0.22222238 ISOTROPIC -0.37504886 -0.03871423 0.39053355 0.02322954 ISOTROPIC 0.11390177 -0.36834134 0.03343433 0.22100525 Hodgkinson et al. (2013) Tidal Calibration KH2013 1.425 3.565 1.669 1.306 KH2013 -1.731 -1.621 -0.024 -0.775 KH2013 -0.441 -1.45 -0.207 -0.085 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