Hot-spotting in the Pacific

Article Abstract:

Recent research has looked at the use of seamounts to locate hotspots and investigate absolute plate motions. It was possible to use a 'hot-spotting' method which brings together the geometry of plate tectonics and the computational power of digital sea-floor topography. This technique has the potential for being used extensively in determining which seamounts were produced by hotspots. It could also produce new information about the history of absolute plate motions and allow the issue of whether hotspots are fixed with respect to one another to be resolved.

Seamounts, Submarine topography

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Seismic gaps and grizzly bears

Article Abstract:

Researchers Y.Y. Kagan and D.D. Jackson tested the seismic-gap hypothesis and found that it was not reliable for predicting earthquakes. This hypothesis holds that earthquakes are likeliest to happen along the parts of plate boundaries with seismic gaps, that is, periods without an earthquake. However, Kagan and Jackson examined the records of the 37 earthquakes that occurred along the North Pacific rim from 1979 to 1989 and found that these high-potential gaps in fact had fewer earthquakes than low-potential gaps.

Seismology, Natural cycles, Earthquake prediction

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A model for the global variation in oceanic depth and heat flow with lithospheric age

Article Abstract:

Fluctuations in heat flow and bathymetry from the sea-floor suggest that the oceanic lithosphere is neither as hot nor as thin as earlier models have represented. The new model also accords better with data from older lithosphere. Using this model as a theoretical basis should help improve knowledge of such lithospheric processes as mid-plate volcanism and swells, regional subsidence and hydrothermal circulation at spreading centers.

Ocean bottom, Marine geophysics

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