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dc.contributor.authorNagaya, Yoshiharu
dc.contributor.authorYabuki, Tetsuichiro
dc.contributor.authorOno, Funakichi
dc.contributor.authorAsada, Akira
dc.date.accessioned2020-02-04T01:28:55Z
dc.date.available2020-02-04T01:28:55Z
dc.date.issued1996
dc.identifier.urihttp://hdl.handle.net/1834/16029
dc.description.abstractAcoustic ranging on the sea floor is one of hopeful methods by which the detection of crustal deformations could be realized in the deep sea. We have been developing a Sea Floor Acoustic Ranging system (SeaFAR) which will detect the strain for a baseline 1 km long with accuracy of 1 cm. SeaFAR repeats the measurement of propagation time of acoustic signal in two way as well as sound velocity in a period longer than a year. Sound velocity is not directly measured but derived from water temperature, salinity and water pressure observed. We have developed one pair of prototypes which measure precise propagation time of acoustic signals, and carried out an experimental measurement on the sea floor 1250 m deep in the Sagami Bay. The result shows that propagation time of acoustic signals can be measured with accuracy of 2x10-6 second and that propagation time varies more than 200x 10-6 second because of the temperature variation in the order of 0 .1℃. It is a next important theme to eliminate of influence of the temperature variation by means of precise measurement of temperature.en_US
dc.language.isojaen_US
dc.relation.urihttps://www1.kaiho.mlit.go.jp/GIJUTSUKOKUSAI/KENKYU/report/rhr32/rhr32-09.pdfen_US
dc.titleDevelopment of the sea floor acoustic ranging system.en_US
dc.typeJournal Contributionen_US
dc.bibliographicCitation.issue32en_US
dc.bibliographicCitation.titleReport of Hydrographic and Oceanographic Researchesen_US
dc.description.statusPublisheden_US
dc.format.pagerangepp.89-99en_US
dc.type.refereedRefereeden_US
refterms.dateFOA2021-01-30T18:48:44Z


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