Mathematics – Logic
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68..259e&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 68, no. 2, May 1984, p. 259-270. Research supported by the Petroleum
Mathematics
Logic
48
Pacific Ocean, Plates (Tectonics), Tectonics, Earthquakes, Geological Faults, Magnetic Anomalies
Scientific paper
A new model for the Easter plate is presented in which rift propagation has resulted in the formation of a rigid plate between the propagating and dying ridges. The distribution of earthquakes, eleven new focal mechanisms, and existing bathymetric and magnetic data are used to describe the tectonics of this area. Both the Easter-Nazca and Easter-Pacific Euler poles are sufficiently close to the Easter plate to cause rapid changes in rates and directions of motion along the boundaries. The east and west boundaries are propagating and dying ridges; the southwest boundary is a slow-spreading ridge and the northern boundary is a complex zone of convergent and transform motion. The Easter plate may reflect the tectonics of rift propagation on a large scale, where rigid plate tectonics requires boundary reorientation. Simple schematic models to illustrate the general features and processes which occur at plates resulting from large-scale rift propagation are used.
Engeln Joseph F.
Stein Sherman
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