A vibracorer is a sediment sampling device
first used on research vessels in the 1960's. The main element in a vibracore is the engine-powered concrete vibrator
that creates an oscillation
in an attached core barrel such as an aluminum irrigation pipe
. The vibrations of the pipe liquifies
beneath it allowing for the pipe to easily penetrate
the ground with little added weight. Once the core sample is removed the barrel is split into two halves using a circular saw exposing the stratigraphy
of the sample.
Vibracores can be used on land where the water table
is near or at the ground surface. Thus, they are mostly used near water bodies such as lakes and rivers, wetland
regions, and coasts. They are also commonly used for ocean research such as sand mining for beach restoration
projects in depths
up to 5000 meters
core samples range from 10 to 25 feet in length on land and up to 40 feet in the ocean.