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| # | Post Title | Result Info | Date | User | Forum |
| How many channels do I need for Seismic Reflection surveying? | 6 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| There is no one right answer to this question. The higher the channel count, the higher the fold (for any given shot interval), and the higher the signal/noise ratio. For land seismic, we generally recommend 24 or higher-fold data. If the shot spacing is equal to the geophone spacing (typical), this means that you must record on at least 48 channels with each shot. In addition, you must have extra channels for electronic Rolling. Taken together, this means that for land CDP reflection, you should have a minimum of 72 channels, which will allow you to roll 48 live channels through a total of 72. | |||||
| MagArrow Magnetic Contamination FAQ | 6 Relevance | 2 years ago | Gretchen Schmauder | Application | |
| Magnetic contamination can be a problem, though rarely. Most often this is caused when a “permanent” magnetic component was accidentally attached to or close to one of the sensors. This can cause big shifts randomly in the data from one or both sensors. Check by removing the sensor Door and visually inspect the two MFAM sensors and their surrounding areas for anything unusual. If you have another magnetometer, like the G-864, you can also measure the magnetic signature of the sensor part of the MagArrow with the following instructions. Turn on the magnetometer Wave the sensor part of the MagArrow above the magnetometer (as close as possible but not touching) Wave in both west and east directions Check whether this is any magnetometer reading change when the MagArrow passes by If reading changes are observed, there must be some contamination. | |||||
