Cruise summary report
Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM2/70 |
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Cruise period | 1970-03-02 — 1970-03-07 |
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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 | The purpose of the cruise was to test the spherical pressure vessels for the ocean bottom seismographs in deep water and to check the descent, bottom release, tracking and recovery of a twin sphere assembly which would hold a seismograph. All taks successfully accomplished.
A subsidiary purpose was to gain familiarity with the use of Ag/AgCl non-polarising electrodes in measuring potential gradients in the sea. |
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Chief scientist | Tim J G Francis (National Institute of Oceanography) |
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Cruise report | (0.25 MB) |
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Ocean/sea areas | |
General | Celtic Sea North East Atlantic Ocean (limit 40W) |
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Specific | Celtic Sea, North East Atlantic |
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Track charts | (0.03 MB) |
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Measurements | |
Biology and fisheries | |
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Gear research | Description: test spherical pressure vessels for ocean bottom seismographs in deep water |
Geology and geophysics | |
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Other geological/geophysical measurements | Quantity: number of recoveries = 1 Description: dahn buoy recovered |
Other geological/geophysical measurements | Description: towing non-polarising electrodes |
Other geological/geophysical measurements | Quantity: number of deployments = 1 Description: dahn buoy laid |