B027 lester027bor2007 Latitude 44.497333 Longitude -122.962167 Elevation 216 m Install Date 2007-04-12 Contents Of Tar files for year YYYY File Contents B027.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B027.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B027.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B027.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B027.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B027.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B027.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B027.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B027.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B027.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 = 316.3 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 -36.180 0.000 0.00000 -0.01104 36.776 -0.00228 CH1 -100.361 0.000 0.00000 -0.00249 89.262 -0.00051 CH2 -61.580 0.000 0.00000 0.00115 49.102 -0.00030 CH3 17.460 0.000 0.00000 0.00810 0.000 0.00000 Detrend reference date 2007-04-12T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -9.9 CH1 -8.5 CH2 -7.0 CH3 -9.1 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 63.994 7.274 CH0 O1 -110.901 5.956 CH0 P1 -125.313 2.685 CH0 K1 -114.813 8.680 CH0 N2 82.354 2.582 CH0 S2 149.733 2.097 CH1 M2 -136.990 11.592 CH1 O1 89.278 4.665 CH1 P1 93.343 2.482 CH1 K1 83.466 6.402 CH1 N2 -129.916 2.726 CH1 S2 -141.835 3.672 CH2 M2 -177.281 3.699 CH2 O1 153.135 3.253 CH2 P1 142.470 1.901 CH2 K1 134.474 3.838 CH2 N2 -113.955 0.869 CH2 S2 100.470 2.579 CH3 M2 80.342 6.565 CH3 O1 -140.098 5.657 CH3 P1 -150.399 2.490 CH3 K1 -134.759 7.238 CH3 N2 80.771 1.557 CH3 S2 103.066 3.587 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 = 316.3 ISOTROPIC 0.29629698 0.51851805 0.29629606 0.22222225 ISOTROPIC 0.11136951 0.32881900 -0.24289637 -0.19729213 ISOTROPIC -0.37580855 0.17044714 0.30762940 -0.10226799 Roeloffs 2010 Tidal Calibration Calculated CH0 orientation = 286.2 degrees east of north ER2010 -0.78450000 -1.83840000 -1.08890000 -1.13530000 ER2010 0.50920000 -0.17740000 -0.66020000 -0.22960000 ER2010 0.03650000 0.78420000 -0.02400000 -0.19090000 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 -1.218 -2.242 -1.039 -1.237 KH2013 0.679 -0.064 -0.832 -0.27 KH2013 -0.102 0.698 0.098 -0.159 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