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.



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 ?
The Kongsberg range of underwater mapping products includes the EM 712RD, EM 2040C and 2040P, EA440/EA640, the Geoacoustics range among others.
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.
2] caracterizada por un campo de dunas, se relevo con el sistema batimetrico por medicion de fase (SBMF) denominado GeoSwath Plus de GeoAcoustics Ltd.
NORDIC BUSINESS REPORT-1 September 2008-Norwegian high-tech group Kongsberg Gruppen ASA acquires UK sonar firm GeoAcoustics Ltd(C)1994-2008 M2 COMMUNICATIONS LTD http://www.
Norwegian high-tech group Kongsberg Gruppen ASA (OSE: KOG) said on Monday (1 September) that its business area Kongsberg Maritime has agreed to acquire the British firm GeoAcoustics Ltd in a NOK42m deal.
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.
The Kongsberg GeoAcoustics GeoSwath Plus COMPACT multibeam mapping system was chosen for this survey as it delivers high resolution bathymetry with coverage of up to 12 times the water depth, along with co-registered geo-referenced side-scan data which can be used for sea floor imagery and classification in shallow water environments.
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.