B081 keenwi081bcs2006 Latitude 33.711167 Longitude -116.714167 Elevation 1467 m Install Date 2006-06-16 Contents Of Tar files for year YYYY File Contents B081.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B081.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B081.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B081.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B081.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B081.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B081.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B081.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B081.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B081.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 (Kilo Pascals) 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 = 3.2 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 -14.070 21.480 -0.00192 -0.00390 0.000 0.00000 CH1 -34.900 50.403 -0.00167 -0.00092 0.000 0.00000 CH2 -23.500 41.233 -0.00240 -0.01790 3.681 0.00072 CH3 -12.960 23.030 -0.00370 -0.01280 5.566 0.00053 Detrend reference date Barometric Response Gauge Response(ns/millibar) CH0 -2.4 CH1 -2.4 CH2 -2.5 CH3 -2.1 Tidal Constituants Gauge Tide Amp(ns) Phase CH0 M2 7.4 19.6 CH0 K1 30.8 6.2 CH0 N2 0.6 3.3 CH0 O1 22.8 6.4 CH0 S2 10.9 10.6 CH1 M2 -9.7 15.0 CH1 K1 -17.2 5.1 CH1 N2 -5.2 3.9 CH1 O1 -27.1 3.7 CH1 P1 -12.9 2.1 CH1 S2 -14.3 6.8 CH2 M2 150.8 6.2 CH2 K1 -18.6 3.1 CH2 N2 158.5 1.9 CH2 O1 -2.0 3.3 CH2 P1 -10.5 1.3 CH2 S2 154.3 2.6 CH3 M2 48.8 6.2 CH3 K1 14.3 5.2 CH3 N2 112.8 0.8 CH3 O1 17.1 6.1 CH3 P1 13.4 2.2 13.4 2.2 CH3 S2 41.4 3.9 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 = 3.2 0.29629630 0.51851852 0.29629630 0.22222222 -0.38236360 0.14827773 0.32305251 -0.08896664 -0.08621614 -0.33939358 0.22197357 0.20363615 Roeloffs 2010 Tidal Calibration Calculated CH0 orientation = 12.1 degrees east of north 0.46382055 0.82425189 0.46838629 0.39745730 -0.32187380 0.26231767 0.62913508 0.16997429 0.00359733 -0.46933429 0.24348118 0.32785011 Reference: Roeloffs, E. (2010), Tidal calibration of Plate Boundary Observatory borehole strainmeters: Roles of vertical and shear coupling, J. Geophys. Res., 115, B06405, doi:10.1029/2009JB006407. Fri Mar 29 00:05:16 MDT 2013