"These hypotheses are going to take a lot of testing," comments Zuber, who plans to look for signs of plate tectonic
activity in gravity maps compiled from Surveyor data.
In the past, plate tectonic
recycling must have operated faster (e.g., Burke et al., 1976; Hargraves, 1986) to keep pace with significantly higher heat production and a still significantly higher primordial heat budget retained from the era of accretion and internal differentiation (e.g., Richter, 1988; Pollack, 1997; Davies, 1999).
"There has always been some uncertainty as to whether the plate tectonic
paradigm would explain what is going on.
The plateau and mountains to the north reveal an apparent flaw in the elegant theory of plate tectonics
, which holds that Earth's thin outer shell, or lithosphere, consists of a broken, shifting patchwork of large segments.
The large earthquake that struck off the west coast of Japan's Hokkaido Island last week is helping earth scientists piece together the complex plate tectonic
puzzle in this part of the world.
Over the same period, the Earth has gained more continental land through volcanic eruptions and plate tectonic
While the plate tectonic
forces push on the entire eastern United States, New Madrid compresses more than others because the lower part of the plate can't support the force, Zoback says.
relating the extreme age and stability of a large part of the Australian continent to its plate tectonic
"Our technique shows that the geological activity that formed the West African continent was due to plate tectonic
movement of ocean crust sinking into the mantle," Smit added.
In the early days of plate tectonic
theory, scientists went looking for anisotropy to provide evidence that plate spreading in the ocean was actually happening.
Foreland fold-and-thrust belts throughout the world are conspicuous features of the convergent plate tectonic