| 1 | command SHIFT [<trc-list> <time> [<p1> <p2> ... <pN>]] |
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| 2 | ============= |
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| 3 | |
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| 4 | key: shift traces in time |
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| 5 | |
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| 6 | Shifts traces by <time> seconds if <trc-list> and <time> are passed. |
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| 7 | If no parameters are passed, the graphic cursor appears and one trace |
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| 8 | can be shifted selecting the trace twice at different times. The |
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| 9 | trace is then shifted by the difference of the two time picks. |
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| 10 | |
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| 11 | If <time> is one of the following keywords a special shift is applied |
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| 12 | to all traces of <trc-list>. |
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| 13 | |
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| 14 | ps_delay Traces are shifted by the travel time difference of |
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| 15 | P and converted S, where the S conversion is generated |
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| 16 | at a depth of <p1> km. If <p2> is the string "slowness" |
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| 17 | the required slowness value is retrieved from the |
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| 18 | "slowness" info entry on each trace. |
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| 19 | |
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| 20 | red_time Reduced time display. Traces are shifted by a |
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| 21 | reduction velocity of <p1>. Each trace distance is |
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| 22 | retrieved from the "distance" info entry. |
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| 23 | |
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| 24 | time_al Aligns traces in absolute time, that means the computed |
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| 25 | time delays account for differences in the start times |
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| 26 | ("start" info entry) of the traces. |
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| 27 | |
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| 28 | [sd_delay not documented] |
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| 29 | |
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| 30 | |
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| 31 | All computed time shifts are added to already existing delays of the |
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| 32 | traces, i.e. they are relative time shifts. If the same shift command |
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| 33 | is applied twice, the time shift is also twice as large. |
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| 34 | |
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| 35 | |
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| 36 | parameters: |
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| 37 | ----------- |
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| 38 | |
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| 39 | <trc-list> --- parameter type: trace list |
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| 40 | List of traces to be shifted by <time> seconds. If omitted one |
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| 41 | trace can be shifted by graphic cursor (see above). |
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| 42 | |
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| 43 | <time> --- parameter type: real |
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| 44 | Time in seconds the traces in <trc-list> are to be shifted. Only |
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| 45 | valid if <trc-list> is specified. <time> can also be a keyword |
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| 46 | determining a shifting algorithm for the traces in <trc-list>. |
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| 47 | A list of valid keywords if given above. |
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| 48 | |
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| 49 | |
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| 50 | qualifiers: |
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| 51 | ----------- |
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| 52 | |
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| 53 | /nomark |
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| 54 | Only valid if <trc-list> is omitted. The selected time points |
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| 55 | at the shift trace are not marked. |
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| 56 | |
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| 57 | |
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| 58 | examples |
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| 59 | -------- |
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| 60 | |
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| 61 | shift ! shift one trace by graphic cursor |
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| 62 | |
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| 63 | shift all -10 ! shifts all traces by 10 sec to the left |
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| 64 | |
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| 65 | shift all ps_delay 640 slowness ! shift all traces to align a |
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| 66 | ! conversion depth coming from |
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| 67 | ! 640 km depth |
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| 68 | |
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