| 摘要 |
A system for surveying a volume of rock or sub-surface below the seabed comprising at least one acoustic generating means for generating intermittent acoustic pulses, and a first signal detection means for detecting the signals generated by the acoustic pulses and/or reflections thereof at a first detection means arranged in a well or hole penetrating beneath the seabed, characterised in that a second signal detecting means is arranged on or above the seabed, and data processing means are provided for combining and processing the results from the first and second detection means. |
