Pacific Coastal & Marine Science Center
Coastal and Marine Earthquake Studies
|SHIPS: Seismic Hazards Investigation in Puget Sound
Types of Seismic Surveys
Data was collected in two modes, one-ship mode and two-ship mode.
In one-ship mode seismic reflection data are recorded by a 2.5 km long streamer on the shooting ship, and refraction data is collected by seismometers located onshore and offshore. When a recording streamer is being towed, the ship can not manuever to avoid boat traffic. Large ships can not pass close astern of the research vessel without damaging the submerged streamer. The Coast Guard assists by notifying ships if they are likely to interfere with operations.
In two-ship mode reflection data and refraction data are collected on the second ship. Additional refraction data are recorded by seismometers.