README For Anza 1-sps Strain Data

The data are stored in a  year/station  directory structure.  There are five files per station CH0, CH1, CH2, CH3 and tensor 

File Name Convention:
BNUM.CH0.YYYY.txt.gz
BNUM.CH1.YYYY.txt.gz
BNUM.CH2.YYYY.txt.gz
BNUM.CH3.YYYY.txt.gz
BNUM.tensor.LAB.YYYY.txt.gz
where BNUM refers to the 4-character ID, e.g. B081, B082 .. and YYYY refers to the year

The time zone is UTC. The data are 1-sps. The null data point for any of the columns is "999999" .

The data sets are generated at 1-sps. However there are data gaps in these colated files. 

The tidal model was generated using Duncan Agnews, SPOTL tidal package.

File Format

	The format for the CH0, CH1, CH2 and CH3 files is:
	Column		Description		Units
	Column 1	DateTime		UTC            
	Column 2	RawStrain		digital counts
	Column 3	LinearStrain		microstrain         
	Column 4	Interplation of missing values	microstrain
	Column 5	Tidal Model			microstrain         
	Column 6	BarometricCorrection	microstrain         
	Column 7	BarometricPressure	millibars           
	Column 8	PorePressure		millibars       
	Column 9	Version			generation date

	The format for the tensor strain file is:
	Column		Description		Units
	Column 1	DateTime		UTC               
	Column 2	Eee+Enn			microstrain      
	Column 3	Eee+Enn_tidal model	microstrain   
	Column 4        Interplation of missing values  microstrain
	Column 5	Eee+Enn_baro		microstrain    
	Column 6	Eee-Enn			microstrain     
	Column 7        Interplation of missing values  microstrain
	Column 8	Eee-Enn_tidal model	microstrain    
	Column 9	Eee-Enn_baro		microstrain   
	Column 10	2Ene			microstrain      
	Column 11       Interplation of missing values  microstrain
	Column 12	2Ene_tidal model	microstrain    
	Column 13	2Ene_baro		microstrain     
	Column 14	BaroPressure		millibar
	Column 15	PorePressure		millibar 
	Column 16	Version      		generation date 

        The null value is 999999. If 1-sps barometric data are available it will be given otherwise there
	will only be 30 minute interval data. 

	The "Interpolation" columns contained interpolated values to replace the null values.
	This column should be substracted from the linear strain to remove the null values.
  
        Note: not all strainmeters have  pore pressure sensors. In that case these columns will be entirely "999999" values.