Geoacoustics

geoacoustics

[¦jē·ō·ə′küs·tiks]
(acoustics)
Study of the acoustic properties of rock, mainly to study possible use of the rock system as a carrier of seismic signals in a communications system.

Geoacoustics

 

a branch of acoustics in which sonic, infrasonic, and ultrasonic phenomena occurring in the earth’s crust are studied. It includes both natural processes (such as the acoustic precursors of earthquakes) and processes associated with the use of elastic waves to study the structure and properties of the upper layers of the earth’s crust (acoustic prospecting, seismic prospecting, deep seismic sounding, and ultrasonic echolocation).

Acoustic prospecting is carried out at a specific frequency, locating foreign ore bodies in massifs between water-filled boreholes by the method of reflection and sounding. Acoustic prospecting began almost simultaneously with hydrolocation and echolocation on the sea bottom. These methods were the first practical application of ultrasound. However, the great absorption of high frequencies (20 kilohertz) in the earth’s crust limits the sounding depth in rock to several dozen meters. At low sonic and infrasonic frequencies the sounding depth is increased, but the possibility of highly detailed study of the section is reduced. Depths of several kilometers can be sounded by utilizing seismic prospecting methods. The structure of layered mediums is also analyzed in greater detail in the boreholes themselves (acoustic logging).

References in periodicals archive ?
Some of these included the Kongsberg GeoAcoustics Geoswath Compact Bathymetry System, Pulsar Side Scan Sonar System, the Kongsberg range of underwater cameras and sub-bottom profilers, oPAP, among many others.
Some of these include the Kongsberg GeoAcoustics Geoswath Compact Bathymetry System, Pulsar Side Scan Sonar System, the Kongsberg range of underwater cameras and sub-bottom profilers, [micro]PAP, among many others.
Developed by Kongsberg Geoacoustics and available now, PulSAR is designed for intuitive operation and easy deployment by non-specialised personnel, enabling effective short-notice surveys using vessels of opportunity.
The Lithuanian Coastal Research and Planning Institute (CORPI) has recently completed the first ever 100% coverage survey of Klaipeda Harbour using the Kongsberg GeoAcoustics GeoSwath Plus COMPACT multibeam echo sounder system.
Kongsberg Geoacoustics based in Great Yarmouth, UK have recently delivered their "GeoSwath Plus" combined shallow water multibeam and side scan system to various well respected research institutes.