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

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Abstract:

The report summarizes Leg 2 of Expedition South Tow, conducted by the RV 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 cmyr for anomalies older than Anomaly 5 to 4.8 cmyr for the younger anomalies. Author

Author(s):
Mudie, John D. ; Grow, John A. ; Dlitgord, Kim D. ; Larson, Peggy A.
Author Organization(s):
SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB
Descriptive Note:
Summary rept. 15 Feb-20 Mar 72,
Pagination:
0042

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SIO-Ref-72-66, MPL-U-36/72
Contract/Grant Number(s):
N00014-69-A-0200-6002, NSF-GA-31377X
Project Number(s):
NR-260-103
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*MARINE GEOPHYSICS, *PACIFIC OCEAN), HYDROGRAPHIC SURVEYING, OCEAN BOTTOM TOPOGRAPHY, SEDIMENTATION, THICKNESS, DEPTH FINDING, MAGNETIC ANOMALY DETECTION
Field(s)/Group(s):
Physical and Dynamic Oceanography
Keyword(s):
MAGNETIC ANOMALIES, OCEAN BOTTOM SPREADING, BATHYMETRY, SOUTH PACIFIC OCEAN, THOMAS WASHINGTON VESSEL
Report Date:
1972 Aug 01