B028 lester028bor2007 Latitude 44.493667 Longitude -122.963833 Elevation 140 m Install Date 2007-03-19 Contents Of Tar files for year YYYY File Contents B028.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B028.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B028.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B028.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B028.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B028.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B028.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B028.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B028.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B028.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 = 282.3 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 -55.020 64.257 -0.00116 -0.00590 -0.000 0.00000 CH1 -123.239 127.000 -0.00095 -0.01166 0.000 0.00000 CH2 -105.583 109.410 -0.00093 -0.00298 0.000 0.00000 CH3 -91.460 102.030 -0.00059 0.00789 -0.000 -0.00000 Detrend reference date 2007-03-19T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -7.2 CH1 -6.8 CH2 -5.3 CH3 -6.8 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 37.812 15.147 CH0 O1 -76.727 5.830 CH0 P1 -88.178 1.924 CH0 K1 -84.636 7.263 CH0 N2 49.044 3.540 CH0 S2 42.223 5.064 CH1 M2 -10.253 5.522 CH1 O1 -10.886 5.198 CH1 P1 -1.311 1.889 CH1 K1 -16.764 5.123 CH1 N2 43.596 0.916 CH1 S2 -64.720 2.556 CH2 M2 -140.080 10.840 CH2 O1 99.794 5.949 CH2 P1 95.216 3.100 CH2 K1 87.538 8.647 CH2 N2 -114.431 3.117 CH2 S2 168.525 0.662 CH3 M2 150.929 1.844 CH3 O1 151.714 2.672 CH3 P1 132.039 1.533 CH3 K1 125.076 3.095 CH3 N2 -79.619 0.750 CH3 S2 71.324 3.339 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 = 282.3 ISOTROPIC 0.29629686 0.51851812 0.29629599 0.22222236 ISOTROPIC 0.39016285 -0.03485750 -0.37621930 0.02091394 ISOTROPIC -0.03752076 0.36872623 -0.10996948 -0.22123599 Roeloffs 2010 Tidal Calibration Calculated CH0 orientation = 313.4 degrees east of north ER2010 1.58471559 2.28488222 1.57893964 0.67846699 ER2010 -0.00526594 0.09871820 -0.54716218 -0.33017398 ER2010 -0.56617326 0.29148058 0.19962620 -0.23469485 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. Hodgkinson et al. (2013) Tidal Calibration KH2013 1.27 2.452 1.226 0.355 KH2013 -0.067 0.038 -0.667 -0.582 KH2013 -0.457 0.218 0.362 -0.146 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