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

 

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