B918 mtsprn918bcs2008 Latitude 35.9357 Longitude -117.6017 Elevation 1042.6 m Install Date 2008-06-21 Contents Of Tar files for year YYYY File Contents B918.YYYY.xml.gauge0.txt.gz Processed data from gauge 0 (CH0) B918.YYYY.xml.gauge1.txt.gz Processed data from gauge 1 (CH1) B918.YYYY.xml.gauge2.txt.gz Processed data from gauge 2 (CH2) B918.YYYY.xml.gauge3.txt.gz Processed data from gauge 3 (CH3) B918.YYYY.xml.Eee+Enn.txt.gz Processed areal strain, manufacturer's calibration B918.YYYY.xml.Eee-Enn.txt.gz Processed differential strain, manufacturer's calibration B918.YYYY.xml.2Ene.txt.gz Processed engineering shear strain, manufacturer's calibration some tars may contain the additional files B918.YYYY.xml.Eee+Enn.ER2010.txt.gz Processed areal strain, Roeloffs [2010], calibration B918.YYYY.xml.Eee-Enn.ER2010.txt.gz Processed differential strain, Roeloffs [2010], calibration B918.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 = 288.9 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 -146.255 305.920 -0.00190 -0.07660 0.000 0.00000 CH1 -105.907 0.000 0.00000 -0.04027 0.000 0.00000 CH2 -193.776 185.940 -0.00034 0.01282 0.000 0.00000 CH3 -2.430 -86.454 -0.00502 -0.00952 72.280 -0.00265 Detrend reference date 2008-06-21T00:00:00 Barometric Response Gauge Response(ns/millibar) CH0 -2.5 CH1 -1.7 CH2 -1.9 CH3 -1.9 Tidal Constituents Gauge Tide Phase Amp(ns) CH0 M2 16.420 9.888 CH0 O1 -24.013 5.975 CH0 P1 -20.167 2.660 CH0 K1 -23.478 7.077 CH0 N2 20.174 2.115 CH0 S2 16.662 4.059 CH1 M2 -142.892 4.704 CH1 O1 62.316 2.521 CH1 P1 68.740 0.998 CH1 K1 67.985 3.145 CH1 N2 -144.777 1.157 CH1 S2 -150.018 2.678 CH2 M2 7.541 15.120 CH2 O1 -6.736 4.419 CH2 P1 -14.981 1.927 CH2 K1 -4.321 4.650 CH2 N2 3.075 2.893 CH2 S2 11.730 7.594 CH3 M2 12.974 17.177 CH3 O1 -14.935 6.900 CH3 P1 -114.108 0.353 CH3 K1 -32.909 7.111 CH3 N2 19.100 3.670 CH3 S2 13.454 8.478 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 = 288.9 ISOTROPIC 0.44444444 0.44444444 0.44444444 0.00000000 ISOTROPIC 0.35118001 0.06031803 -0.41149804 0.00000000 ISOTROPIC -0.27240313 0.44033237 -0.16792924 0.00000000 Hodgkinson et al. (2013) Tidal Calibration KH2013 0.702 1.417 0.546 0.515 KH2013 0.753 0.604 -0.501 -0.132 KH2013 -0.113 1.047 0.194 -0.106 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