Seis_Pick 1.0

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 starts :- Pick S-wave starto :- Pick P-wave enda :- Pick S-wave endP :- Delete P-wave start pickS :- Delete S-wave start pickO :- Delete P-wave end pickA :- Delete S-wave end pickw :- Wipe picks on one traceW :- 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 Matlabd-deOaos xlim property, to view a subset of the full trace. This is only an xlim operation, the trace itself is not cut. When using d-de?cd-deOao, the user must press d-de?cd-deOao once to define the start of the new time window, and d-de?cd-deOao again to define the end of the window. z :- Zoom to selected traces - Effectively, this tool controls Matlabd-deOaos ylim property, to view one (or more) of the geophones only. As per the d-de?cutd-deOao option, press d-de?zd-deOao once to select the topmost trace to view, and d-de?zd-deOao again to select the lowermost trace to view. C :- Undo cut to view full trace - Resets Matlabd-deOaos xlim property to default settings. Z :- Undo zoom to view all traces - Resets Matlabd-deOaos 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, d-de?Ld-deOao loads them. See d-de?Pickmatrix formatd-deOao 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

Requirements:	No special requirements
Platforms:	Matlab
Keyword:	Azimuth,  Controls,  Effectively,  Matlab,  Perform,  Performs,  Press,  Property,  Stations,  Windows
Users rating:	0/10