Natural Resources Canada
www.nrcan.gc.ca
Common menu bar links
THOT: Trans-Hudson Orogen Transect
 |  |
THOT data were acquired in 1991 and 1994. This set of comments refers to the 1991 data.
The SEGP1 geometry files off diskettes were less complete than those off tape: the diskettes contain only every second station. However, the high resolution lines are not on the tape.
A note about the high resolution lines (1A, 1B): Only every 5th station is given, and there are more stations in the case of 1AHR.
GPS information has been added by hand from hardcopy for lines 1A, 1A HR, 1B, 1B HR. The GPS info is on printouts containing fewer stations than the tape (LF5487). There is often some ambiguity as to what station a GPS position refers to.
To get an optimal, complete set, the following files are needed: All files off tape, and the normal and high resolution lines off the diskettes. The two sets are listed separately below.
| Data type | Lines (1991) |
|---|---|
| SEGP1 files off tape | 1A (14 k), 1B (34 k), 2 (112 k), 3 (216 k), 4 (36 k), 5 (82 k), 7A (58 k), 7B (47 k), 7C (18 k), 9 (448 k), 10 (152 k), all compressed (408 k) |
| SEGP1 files off diskettes | 1A (8 k), 1AHR (9 k), 1B (18 k), 1BHR (7 k), 2 (55 k), 3 (120 k), 4 (20 k), 5 (43 k), 7A (58 k), 7B (26 k), 7C (10 k), 9 (448 k), 10 (152 k), all compressed (328 k) |
| CDP coordinates | 1A, 1B, 2, 3, 4, 5, 7A, 7B, 7C, 9, 9A, 9B, 10, |
Comments on the 1994 data:
The first breaks are in (.LCT) files which are sorted in shotpoint order. For each shotpoint, first break times are ordered by trace from trace 1 to trace 480. Values of -1 indicate traces which were not picked.
Front end mute means a mute designed to remove first breaks and refractions AFTER NMO. S-2-D was muted only according to % stretch.
Migration velocities were 90 % of the stacking velocities.
| Data type | Lines (1994) |
|---|---|
| SEGP1 files | S-1-A (296 k), S-2-A (248 k), S-2-B (608 k), S-2-C (224 k), S-2-D (368 k), S-3-A (408 k), S-3-B (440 k), all compressed (792 k) |
| observers notes | S-1-A (82 k), S-2-A (71 k), S-2-B (192 k), S-2-C (64 k), S-2-D (200 k), S-3-A (136 k), S-3-B (136 k), all compressed (224 k) |
| mute files | S-1-A, S-2-A, S-2-B, S-2-C, S-2-D, S-3-A, S-3-B, all compressed, Readme Mute |
| stacking velocities | S-1-A, S-2-A, S-2-B, S-2-C, S-2-D, S-3-A, S-3-B, all compressed, Readme Velocities |
| compressed first breaks | S-1-A (240 k), S-2-A (288 k), S-2-B (440 k), S-2-C (320 k), S-2-D (352 k), S-3-A (248 k), S-3-B (216 k) |
| compressed GMG statics files | S-1-A (208 k), S-2-A (176 k), S-2-B (424 k), S-2-C ( 74 k), S-3-A ( 94 k), S-3-B |
| CDP coordinates | S-1-A, S-2-A, S-2-B, S-2-C, S-2-D, S-3-A, S-3-B |
| |
