B087 fordra087bcs2006 Latitude 33.4955 Longitude -116.60267 Elevation 1139 m Install Date 2006-06-13 Contents Of Tar files for year YYYY File Contents B087.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B087.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B087.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B087.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B087.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B087.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B087.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B087.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B087.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B087.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: 0.1 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 = 340.7 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 20.890 0.000 0.00000 0.00010 -24.989 -0.00065 CH1 -18.950 27.392 -0.00250 -0.00119 0.000 0.00000 CH2 -24.680 42.041 -0.00324 -0.00456 0.242 0.00069 CH3 -13.790 19.651 -0.00211 0.00114 0.000 0.00000 Detrend reference date 2006-06-13T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -3.6 CH1 -2.3 CH2 -3.4 CH3 -4.5 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 61.293 2.508 CH0 O1 -28.321 2.817 CH0 P1 -23.544 1.256 CH0 K1 -29.443 3.378 CH0 N2 56.223 0.853 CH0 S2 125.942 1.015 CH1 M2 31.213 6.829 CH1 O1 6.573 6.209 CH1 P1 8.192 2.682 CH1 K1 3.764 6.271 CH1 N2 55.259 0.820 CH1 S2 34.206 3.561 CH2 M2 -22.980 11.436 CH2 O1 155.245 1.890 CH2 P1 108.935 1.025 CH2 K1 136.119 2.159 CH2 N2 -22.684 3.050 CH2 S2 -7.113 5.264 CH3 M2 -126.336 4.015 CH3 O1 179.387 5.400 CH3 P1 164.884 1.946 CH3 K1 178.948 5.485 CH3 N2 -69.211 0.742 CH3 S2 -155.215 1.828 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 = 340.7 ISOTROPIC 0.29629655 0.51851809 0.29629644 0.22222225 ISOTROPIC -0.20940582 0.34483678 0.07147128 -0.20690225 ISOTROPIC -0.33133703 -0.13513642 0.38539079 0.08108265 Hodgkinson et al. (2013) Tidal Calibration KH2013 1.297 0.724 1.11 -0.78 KH2013 0.811 -0.364 -0.388 -0.241 KH2013 -1.451 0.738 -0.91 0.136 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