Shipboard Cruise Report on Leg Two of Expedition South Tow: Studies in the Southeast Pacific.

• Main Authors: Mudie,John D., Grow,John A., Dlitgord,Kim D., Larson,Peggy A.
• Other Authors: SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB
• Format: Text
• Language: English
• Published: 1972
• Subjects: Physical and Dynamic Oceanography; (*MARINE GEOPHYSICS; *PACIFIC OCEAN); HYDROGRAPHIC SURVEYING; OCEAN BOTTOM TOPOGRAPHY; SEDIMENTATION; THICKNESS; DEPTH FINDING; MAGNETIC ANOMALY DETECTION; MAGNETIC ANOMALIES; OCEAN BOTTOM SPREADING; BATHYMETRY; SOUTH PACIFIC OCEAN; THOMAS WASHINGTON VESSEL; Antarctic; Pacific; Antarc*
• Online Access: http://www.dtic.mil/docs/citations/AD0749930; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0749930

The report summarizes Leg 2 of Expedition South Tow, conducted by the R/V THOMAS WASHINGTON from Papeete, Tahiti to Valparaiso, Chile during 15 February - 20 March 1972. Extensive near-bottom geophysical data over the Pacific-Antarctic Rise at 51 degrees S were obtained in order to study the detailed structure of the magnetic time scale between magnetic Anomaly 3 on both sides of the rise crest. Underway bathymetry, magnetic, and navigation plots are included. An excellent surface magnetic profile on the west flank of the Pacific-Antarctic Rise showed Anomalies 1-20 clearly with an abrupt increase in the spreading half-rate from 2.3 cm/yr for anomalies older than Anomaly 5 to 4.8 cm/yr for the younger anomalies. (Author)