B057 lucasv057bcn2008 Latitude 38.0273 Longitude -122.5655 Elevation 14.4 m Install Date 2008-06-10 Contents Of Tar files for year YYYY File Contents B057.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B057.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B057.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B057.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B057.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B057.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B057.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B057.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B057.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B057.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 = 206.9 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 -29.620 31.504 -0.00196 0.00170 0.000 0.00000 CH1 -65.990 47.953 -0.00166 -0.00418 27.698 -0.00733 CH2 -80.140 65.426 -0.00193 -0.01209 32.081 -0.01216 CH3 -108.089 83.965 -0.00157 -0.01311 41.353 -0.00902 Detrend reference date 2008-06-10T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -3.4 CH1 -3.3 CH2 -3.8 CH3 -3.0 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 174.241 6.643 CH0 O1 68.948 5.036 CH0 P1 73.142 2.512 CH0 K1 68.887 7.770 CH0 N2 -146.759 1.900 CH0 S2 82.165 2.181 CH1 M2 22.010 11.743 CH1 O1 -49.655 4.914 CH1 P1 -57.519 1.631 CH1 K1 -57.250 4.903 CH1 N2 29.186 2.750 CH1 S2 32.327 3.704 CH2 M2 -11.241 12.857 CH2 O1 -41.534 5.099 CH2 P1 -67.646 1.381 CH2 K1 -75.243 4.545 CH2 N2 17.475 2.324 CH2 S2 -37.115 2.636 CH3 M2 -23.601 4.332 CH3 O1 24.750 5.093 CH3 P1 32.178 1.780 CH3 K1 33.892 4.891 CH3 N2 -63.467 0.529 CH3 S2 -7.749 2.387 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 = 206.9 ISOTROPIC 0.29629687 0.51851761 0.29629626 0.22222259 ISOTROPIC -0.32227708 -0.14945949 0.38206005 0.08967651 ISOTROPIC 0.22309846 -0.33887462 -0.08754862 0.20332479 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.728 2.024 0.284 0.891 KH2013 -0.64 -0.324 0.675 -0.04 KH2013 0.051 -0.287 0.111 0.156 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