Schmincke, Hans-Ulrich and Roland, Roland (1994) OZEANVULKAN 1993 - [METEOR] cruise No. 24 [M24], 15 April - 9 May 1993. . Meteor-Berichte, 94 . Leitstelle METEOR, Hamburg, 102 pp. DOI 10.2312/cr_m24.

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Abstract

The aim of METEOR cruise M 24 was a detailed analysis of the facies variations of
different types of volcaniclastic deposits on the submarine flanks of Gran Canaria, Canary
Islands, their distribution at proximal, medial and distal distances from the island, the
structure of the submarine island flanks and the density, gravimetric, magnetic and
structural signature of the deeper basement beneath the island and the sedimentary basin
north of Gran Canaria. Methods used included seismic, topographic, gravity, and magnetic
measurements as well as near-surface sediment sampling (Fig. 1).
Emphasis on the first leg of the cruise was on high resolution seismics using an array of 4
sleeve guns (4 x 40 inch3) fired at 5, 7.5, or 10 s intervals recorded by a 24-channel, 150 m
long streamer. A total length of 2117 km was acquired along 50 profiles. At 9 stations
sediment sampling in combination with measurements of heat flow density was attempted,
resulting, however, only in 2 Kastencores (3 m) and 5 boxcorer samples (0.3 - 0.5 m).
Central operation of the second leg was a combined offshore-onshore refraction seismic
survey using 8 ocean bottom seismographs (OBS) and 8 land stations on Gran Canaria.
The seismic energy was generated by firing two 32 I airguns at 1- or 2-min. intervals. The
seismic stations were distributed in an -75 x 70 km array offshore and onshore with 7
landstations on the northern half of Gran Canaria and one in Fataga (-35 km south of the
northern coast).
Gravity was measured continuously throughout the entire cruise at 10 s intervals and
stored together with navigation data on hard disk and diskettes. Swath bathymetry using
the onboard Hydrosweep system was recorded continuously as well, during bad weather
(> 6 Bft), however, with significant unreliability. Magnetic measurements were taken
along all seismic profiling as well as sedimentechographic recording with the onboard
Parasound system.
The results of the cruise form the base to define the locations of drill sites along a traverse
through the submarine apron of Gran Canaria (Volcanic Island Clastic Apron Project,
VI CAP).

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