Abstract
U.S. Naval Oceanographic Office surveys have updated bathymetry for 1300 km of the Emperor Fracture Zone (EFZ). Multi-beam swath mapping sonar provides up to total coverage on survey lines of various spacings. The feature's accurate position is obtained with LORAN-C data plus navigational satellite data. Data are presented at a 200 fm (366 m) contour interval on a Mercator projection. The EFZ apparently was a spreading rift along a paleo-plate boundary of a microplate some 70 m.y. ago. At present, it is a relict feature. The EFZ is a series of secondary and tertiary linear ridges and troughs. The overall trend is from NW to SE. There are three principal secondary segments: from 46°15'N, 172°50'E to 41°30'N, 178°E to 40°30'N; and 180° to 36°45'N, 175°30'W. Apparent pull-apart basins are found within each segment. The growth of listric normal faults may also explain the growth of the intrafracture zone basins. The most complex bathymetry is found where the Chinook Fracture Zone intersects the EFZ.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
