Geophysical Investigation to Map Bedrock Profile and Determine the Location of a Historic Drainage Ditch, Sydney, NSW (Q3 2016).

  • Site View.
  • Site View.
  • The arrayed of towed behind a vechicle for efficient surveying.
  • A shot being taken.

GBG Australia undertook a geophysical investigation to map the depth to bedrock and the location a histroric drainage ditch under a major road in the North Shore of Sydney, NSW. The project was undertaken as part of the planning processing associated with a HDD bore.

MASW was utlitsed for the investigation with a Gemetrics Geode seismic recorder being used to record the data. An array of 24, 4.5Hz geophones was utilised for the survey. A sledgehammer striking a rubber plate was used to generate the seismic energy. The work was conducted during daylight and night times hours to maximise data coverage.

All shot locations were taken using a high accuracy DGPS.

Figure 1: Site View.

Figure 2: Site View.

Figure 3: The array was towed behind a vechicle for efficient surveying.

Figure 4: A shot being taken.