Cruise summary report
Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM7/69 |
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Cruise period | 1969-08-29 — 1969-09-22 |
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Status | Completed |
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Port of departure | Barry, United Kingdom |
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Port of return | Barry, United Kingdom |
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Purpose | Research |
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Objectives | Centrally to the cruise was a seismic experiment to determine crustal structure along lines westwards from the Pembrokeshire coast to the continental margin southwest of Ireland. The R.R.S. John Murray occupied sono-buoy recording stations and acted as communications centre to liase between other ships and stations.
Several minor experiments were scheduled:
a) collection of surface sea water samples at two stations
b) trials of oceanographic logging equipment
c) trials with a sono-buoy and sparker and an airgun to obtain wide angle reflections and refractions. |
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Chief scientist | Derek J Blundell (University of Birmingham Department of Geology with Geophysics) |
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Cruise report | (0.40 MB) |
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Ocean/sea areas | |
General | Irish Sea and St. George's Channel Celtic Sea North East Atlantic Ocean (limit 40W) |
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Specific | St George's Channel, Celtic Sea and Porcupine Seabight |
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Measurements | |
Physical oceanography | |
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Water bottle stations | Quantity: number of stations = 2 Description: T surface only |
Geology and geophysics | |
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In-situ seafloor measurement/sampling | Description: magnetometer |
Seismic refraction | Description: sparker |