Seismic survey in Fiordland, March 1974

By: Davey, F.J.
Contributor(s): Williams, R.B | DSIR, Geophysics Division. Wellington.
Material type: materialTypeLabelBookSeries: Technical note / Geophysics Division ; no. 71.Publisher: 1975Description: 13 p.Report number: GEOP-TN--71Subject(s): SEISMIC SURVEYS | FIORDLAND | REFRACTION | CRUST | SEISMIC METHODS | INSTRUMENTS
Incomplete contents:
A crustal seismic refraction experiment was carried out in Fiordland from the DSIR research RV Tangaroa. The method and equipment used are described. Recording stations were manned by two people and sited on the edges of fiords. The shots were fired along the fiords from the ship. Hydrophones and geophones were used as detectors at the recording stations. The geophones, sited on solid rock outcrops, gave the better results. The seismic signals were generated using Aquaflex, a cord explosive, and Geophex, a bulk explosive. The former was far easier to use but was limited in useful range to about 30 km. Radio communications between the ship and shore stations involved the use of large aerials on shore and very satisfactory results were obtained. Some practical problems were encountered as the large size of the aerial limited the availability of sites suitable for erecting them. Other problems encountered during the survey and further details of the equipment used are also given. (auth.)
In: Technical note / Geophysics Division
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Item type Current library Call number Copy number Status Date due Barcode
JOURNAL JOURNAL WELLINGTON OFF-SITE STACK NO. 71 1975 1 Available J011794

1 ref; 9 figs

A crustal seismic refraction experiment was carried out in Fiordland from the DSIR research RV Tangaroa. The method and equipment used are described. Recording stations were manned by two people and sited on the edges of fiords. The shots were fired along the fiords from the ship. Hydrophones and geophones were used as detectors at the recording stations. The geophones, sited on solid rock outcrops, gave the better results. The seismic signals were generated using Aquaflex, a cord explosive, and Geophex, a bulk explosive. The former was far easier to use but was limited in useful range to about 30 km. Radio communications between the ship and shore stations involved the use of large aerials on shore and very satisfactory results were obtained. Some practical problems were encountered as the large size of the aerial limited the availability of sites suitable for erecting them. Other problems encountered during the survey and further details of the equipment used are also given. (auth.)

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