Seis_Pick (Scripts) Publisher's description
from James Verdon
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 MatlabвЂ™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 вЂ?cвЂ™, the user must press вЂ?cвЂ™ once to define the start of the new time window, and вЂ?cвЂ™ again to define the end of the window.
z :- Zoom to selected traces - Effectively, this tool controls MatlabвЂ™s ylim property, to view one (or more) of the geophones only. As per the вЂ?cutвЂ™ option, press вЂ?zвЂ™ once to select the topmost trace to view, and вЂ?zвЂ™ again to select the lowermost trace to view.
C :- Undo cut to view full trace - Resets MatlabвЂ™s xlim property to default settings.
Z :- Undo zoom to view all traces - Resets MatlabвЂ™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, вЂ?LвЂ™ loads them. See вЂ?Pickmatrix formatвЂ™ 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.
X :- Exit SEIS_PICK
System Requirements:No special requirements.
Program Release Status: New Release
Program Install Support: Install and Uninstall