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TomTime
TIME-PICKING SOFTWARE FOR WINDOWS |
 * Output formatted as input for 3D tomography program GeoTomCG * Reads all common seismograph formats * Versatile filtering options * Works effectively with large files, 144 channels or more * User can select any range of channels to display. * Economical, only $400.00
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| TomTime provides automatic and manual picking of traveltimes
and amplitudes for all common seismograph waveform files. Output is in
the format used for input by the 3D tomographic program GeoTomCG.
The format is: RayIdentifier Source X,Y,Z Receiver X,Y,Z Time Amplitude
(optional). Times picked with automatic picking are the first breaks, and amplitudes are on the first peak following the time pick. Minimum and maximum time limits can be set to guide the autopicking. Times and amplitude positions can be reset manually. TomTime contains features to help obtain accurate time picks and amplitudes, even in noisy data. These features include versatile filtering and display options. Filtering options include smoothing with Parzen filters, low-cut filters from 10 Hz to 400 Hz, high-cut filters from 50 Hz to 1000 Hz, and notch filters. The user can display any sequential set of channels. The display is not limited to fixed ranges such as the first half or last half. The picture shows traces 34 to 51 from a 146-channel seismograph file. This flexibility allows the display of as many channels as desired for using traces with high signal-to-noise ratios as a guide for picking times in noisier traces. Alternatively, the user can display fewer channels so each trace can be of large amplitude on the screen. A zoom option allows the user to display any time range. Typing 3D source and receiver coordinates is tedious, especially when boreholes are crooked. Accordingly, an option is provided to reduce their manual entry. The user can assign each source and receiver an identifying integer, and prepare a coordinate file that lists each source and receiver position and the corresponding identifier only once. The source and first receiver in each seismograph waveform data file can be designated by identifiers added to the waveform file name. TomTime can read the coordinate file before reading waveform files, and assign coordinates corresponding to the identifiers. After the coordinate file has been read, another display option allows times from a GeoTomCG data file to be displayed on the traces. TomTime reads the coordinates in the data file and matches them with the ones in the coordinate file described above. It then displays the time from the data file on the appropriate traces. GeoTomCG can provide a data file of calculated times, so this option allows the display of calculated times from tomographic inversions. Time-picks and amplitudes from selected individual seismograph files can be combined into one data file. TomTime is written in MS Visual Basic and runs under Windows with a graphical user interface. It is based on the program SIPWin that was developed for seismic refraction by Rimrock Geophysics, Inc., Lakewood, Colorado. TomTime has been revised for 3D tomography, and is distributed under an agreement with Rimrock Geophysics. |
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