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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