PGS first tested the multi-level source in 2008, during the very first GeoStreamer survey. This concept was commercialized in 2009, winning awards from the Indonesian Petroleum Association and the Society of Exploration Geophysicists, and later contributed to the development of GeoSource.
Air guns in a multi-level solution are arranged at two or three different depths. They are fired in rapid succession, in a manner that reinforces the down-going source wavefield and decouples the source ghost wavefield.
As a result, the emitted source wavefield has a larger bandwidth, notably on the higher frequency side, and notches in the source amplitude spectrum are weaker.