The seismfile
Description
A file prescribing the array geometry, data components and the sampling time interval.
File Name
\(data folder)\RESULT\seism.d
Format
#COMP 3 (1 ud / 2 ns & ew / 3 three components) ßEnter the waveform components (type 1, 2 or 3 following a space or a tab after #COMP).
#DT 0.01 ßEnter the time interval of waveform sampling (type a figure following a space or a tab after #DT).
0.000000 0.000000 S01.d 1 ßFrom left to right, the x coordinate [km], y coordinate [km], data file name, and integer 1 or 0 (1 if center).
0.000001 0.018000 S02.d 0
0.017119 0.005562 S03.d 0
0.010581 -0.014562 S04.d 0
-0.010579 -0.014563 S05.d 0
-0.017119 0.005564 S06.d 0
Notes
(*1) Appending "#"
at the head of a line comments that line out (except for #COMP and #DT). There
is no rule on the order of arrangement of these data. There is no special
format for the numbers.
(*2) When only two sensors
constitute the array, think of either one of them as being at the center and
the other as lying around the circle, and accordingly assign them integers of 1
and 0 to the right of the data file names. When three sensors constitute the
array, there are two options: either you think of it as an array of two
stations around the circle plus another at the center and apply the SPAC and H0
methods, or you think of all three stations as lying around the circle and
apply the CCA method.
(*3) When there is only one
sensor constituting the array, the integer to the right of the data file name
can be either 0 or 1 (the power spectral densities and the H/V spectrum alone
are calculated, and there will be no array processing).
(*4) When the records have
three components (#COMP 3), the H/V spectrum is calculated using the file
indicated in the top data line.
(*5) Assigning identical x and
y coordinates to all stations automatically activates the huddle test mode,
where the power spectral densities, the magnitude-squared coherences and phase
differences are calculated. The coherences and phase differences calculated are
relative to the data indicated in the top line.
Example: How to write the seismfile in the case of a huddle test
#COMP 3
#DT 0.01
0.000000 0.000000 S01.d 1
0.000000 0.000000 S02.d 0
0.000000 0.000000 S03.d 0