B040 yorkmn040bcn2007 Latitude 41.8308 Longitude -122.4205 Elevation 819.5 m Install Date 2007-10-12 Contents Of Tar files for year YYYY File Contents B040.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B040.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B040.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B040.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B040.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B040.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B040.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B040.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B040.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B040.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 = 272.7 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 -139.881 129.490 -0.00074 -0.01660 0.000 0.00000 CH1 -140.427 209.690 -0.00048 0.01243 0.000 0.00000 CH2 -173.510 218.560 -0.00048 0.00836 0.000 0.00000 CH3 -143.748 168.900 -0.00039 0.00379 0.000 0.00000 Detrend reference date /detrend_ref Barometric Response Gauge Response(ns/millibar) CH0 -4.0 CH1 -4.6 CH2 -4.3 CH3 -3.1 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 21.586 7.482 CH0 O1 -164.063 1.391 CH0 P1 159.269 0.397 CH0 K1 -172.071 1.560 CH0 N2 3.765 1.624 CH0 S2 39.304 4.947 CH1 M2 56.709 6.474 CH1 O1 -43.831 5.388 CH1 P1 -42.003 2.409 CH1 K1 -54.706 6.919 CH1 N2 78.758 1.982 CH1 S2 119.791 0.922 CH2 M2 -105.648 7.594 CH2 O1 68.238 5.988 CH2 P1 66.337 2.819 CH2 K1 69.204 7.684 CH2 N2 -105.926 2.062 CH2 S2 -86.143 2.207 CH3 M2 -33.717 10.010 CH3 O1 49.635 6.069 CH3 P1 49.593 3.029 CH3 K1 56.339 8.067 CH3 N2 -48.756 2.653 CH3 S2 -2.415 5.876 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 = 272.7 ISOTROPIC 0.29629683 0.51851769 0.29629626 0.22222255 ISOTROPIC 0.38080025 -0.15418026 -0.31912789 0.09250791 ISOTROPIC 0.09287777 0.33675321 -0.22757856 -0.20205241 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.223 1.572 -0.072 1.26 KH2013 -0.228 0.433 -0.03 -0.051 KH2013 -0.5 -0.218 0.517 0.008 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