RRS Discovery D73_2

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD73_2
Cruise period1975-08-03 — 1975-08-26
Port of departurePonta Delgada, Portugal
Port of returnSouthampton, United Kingdom
ObjectivesThe objective of this Cambridge experiment was to obtain seismograms from OBS laid west of the median valley at 45 degrees from shots fired east of the valley at moderate ranges in order to study the attenuation of P and S waves propogated in the crust and upper mantle as they cross the region of the postulated magma chamber. Four sonobuoys were to be deployed on two occasions at the ends of the shot lines to supply necessary crustal structure information.
Chief scientistAnthony S Laughton (Institute of Oceanographic Sciences Wormley Laboratory)
ProjectExplosion seismology at the Ridge Crest using OBS and Sonobuoys
Cruise reportRRS Discovery D73_2 cruise report d73_data_report.pdf (7.21 MB)  RRS Discovery D73_2 cruise report d73_leg2_cambridge.pdf (3.28 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
SpecificKing's Trough Line
Track chartsRRS Discovery D73_2 cruise track — d73_data_reporttrack.pdf (0.11 MB)  RRS Discovery D73_2 cruise track — d73_leg2_cambridgetrack.pdf (0.82 MB) 
Geology and geophysics 
Long/short range side scan sonarQuantity: number of deployments = 4
Description: A set of 4 sonobuoys were deployed and recovered several times during the cruise.