Accession Number : ADA017774

Title :   Report on Leg 1B of Expedition COCOTOW: Observations at the East Pacific Rise-Siqueiros Transform Fault Intersection.

Descriptive Note : Summary rept.,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB

Personal Author(s) : Crane,Kathleen

Report Date : 22 SEP 1975

Pagination or Media Count : 13

Abstract : The second half of COCOTOW I Expedition concentrated on near-bottom geological and geophysical investigation near 8 deg 17 min N and 104 deg 10 min W. Detailed structural analysis of the East Pacific Rise Siqueiros Transform Fault intersection revealed a complex arrangement of lineations which can be subdivided into three trends: (1) N-S constructional outliers protrude into the deep tow basin from the East Pacific Rise. Normal crustal spreading is occurring well within the northern confines of the survey area; (2) major E-W aligned scarps, along the fracture Zone Median Ridge, have vertical offsets up to 350 fathoms; and (3) The formation of WNW-ESE trending tension gashes reveal a component of extension across the fracture zone. (Author)

Descriptors :   *Faults(Geology), *Marine geology, *Seafloor spreading, North Pacific Ocean, Tropical regions, Marine geophysics, Structural geology, Linearity, Alignment, Ocean ridges, Bathymetry, Ocean bottom topography, Mexico, Oceanic crust, Tension, Tectonics, Basalt, Fracture(Mechanics), Plankton

Subject Categories : Physical and Dynamic Oceanography
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE