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Creating Database

3. Output

   Using icon button or the  item “Save”, or “Save as..." of the File menu you write the Project File to the disc.

   In the example it is file  Colima.ah4db 

   If different Seed Volumes contain the same station name, all of them but one must be excluded. In the example file  Colima.err_log  contains  complete list of  stations and records attributes. Dbase directory (in the example “Dbase”) contains following information:

    response/ - instrument response directory  

    wf_l/        - binary time series files directory (1 count per second)

    wf_v/        - binary time series files directory (1 count per 10 second)

     
    Frequency-time analysis and source inversion programs use following Dbase tables:

    "Colima_l.wfdisc"-  Waveform file header and descriptive information. This table provides a pointer (or index) to waveforms stored on wf_l/ directory.
    "Colima_v.wfdisc"- This table provides a pointer  to waveforms stored on wf_v/ directory.
    "Colima.instrument" -  Generic (default) calibration information about a station. This table serves three purposes.  It holds nominal one-frequency calibration factors for each instrument.  It holds pointers to the nominal frequency-dependentcalibration for an instrument.  Finally, it holds pointers to the exact calibrations obtained by direct measurement on a particular instrument.  See sensor
    "Colima.site"- Station location information. Site names and describes a point on the earth where seismic measurements are made ( e.g.  the location of a seismic instrument or array).  It contains information that normally changes infrequently, such as location.  In addition, site contains fields to describe the offset of a station relative to an array reference location.  Global data integrity implies that the sta/ondate in site be consistent with the sta/chan/ondate in sitechan
    "Colima.sensor"-  Specific calibration information for physical channels. This table provides a record of updates in the calibration factor or clock error of each instrument, and links a sta/chan/time to a complete instrument response in the relation instrument
    "Colima.sitechan"- Station-channel information.This relation describes the orientation of a recording channel at the site referenced by sta.  This relation provides information about the various channels (e.g.  sz, lz, iz ) that are available at a station and maintains a record of the physical channel configuration at a site
    "Colima.origin" - Data on event time, location and magnitude.


Creating Database

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