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  • License: Freeware
  • Last update: 5 years ago
  • Total downloads: 20
  • Price: Free |
  • Operating system: Linux, Mac OS X, Win All, BSD, Solaris
  • Publisher: James Verdon
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scripts default iconSeis_Pick (Scripts) Publisher's description

Seis_pick provides an interactive environment for picking seismic waveforms.

Seis_pick provides an interactive environment for picking seismic waveforms. It has been developed with the aim of processing 3-component downhole microseismic data, although is suitable for all 3-component seismic data. Seis_Pick displays seismic traces, allowing the user to pick P-wave and S-wave phases. When phases have been picked, the user can enter spectral analysis to view the frequency content of each phase, as well as pre-event noise. The user can also enter hodogram analysis to view the polarization of phases. This is particularly useful to check that picked P-wave and S-wave phases are polarized orthogonally, as well as to compute the back-azimuth of the detected event (using P-wave polarization). Seis_Pick also provides a number of other signal-processing facilities, including a band-pass filter, or predictive filter that uses pre-event noise to create a notch filter.

Seis_Pick has been developed as part of BUMPS (Bristol University Microseismicity ProjectS).

Seis_Pick Action Buttons:

p :- Pick P-wave start
s :- Pick S-wave start
o :- Pick P-wave end
a :- Pick S-wave end
P :- Delete P-wave start pick
S :- Delete S-wave start pick
O :- Delete P-wave end pick
A :- Delete S-wave end pick
w :- Wipe picks on one trace
W :- Wipe picks on all traces

f :- Predictive filter - The predictive filter inverts the frequency spectrum of the pre-event noise to create a notch filter. To define the pre-event noise, the predictive filter requires that the P-wave start be picked. If it is not, no filtering will occur.

b :- Bandpass filter - Once bandpass has been selected, the user must enter a length 2 vector defining the low and high pass corner frequencies.

F :- Remove filtering - When filtering, the unfiltered traces are stored in a dummy trace. If selected, SEIS_PICK returns to the original unfiltered trace. The filtered traces are not saved.

h :- Enter hodogram analysis (individual station)
q :- Enter spectral analysis (individual station)
H :- Perform hodogram analysis on all stations - Performs hodogram analysis on P-wave windows only to compute event azimuth.

c :- Cut traces - Effectively, this tool controls Matlab’s xlim property, to view a subset of the full trace. This is only an xlim operation, the trace itself is not cut. When using �c’, the user must press �c’ once to define the start of the new time window, and �c’ again to define the end of the window.

z :- Zoom to selected traces - Effectively, this tool controls Matlab’s ylim property, to view one (or more) of the geophones only. As per the �cut’ option, press �z’ once to select the topmost trace to view, and �z’ again to select the lowermost trace to view.

C :- Undo cut to view full trace - Resets Matlab’s xlim property to default settings.

Z :- Undo zoom to view all traces - Resets Matlab’s ylim property to default settings.

E :- Save plot of traces to .eps - On selecting this option, the user must input the file-name to which the plot of traces is saved.

L :- Load pre-existing pickmatrix - If an ascii file of picks already exists, �L’ loads them. See �Pickmatrix format’ section for details on the format of a pick matrix file. On selecting this option, the user is prompted for the file-name of the picks file.

M :- Save picks to ascii file - Saves the picks to an ascii format pick matrix file. On selecting this option, the user is prompted for the file-name of the picks file.

J :- Toggle help panel - Removes/displays a helpful reminder of all SEIS_PICK options.


System Requirements:

No special requirements.
Program Release Status: New Release
Program Install Support: Install and Uninstall

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