Thermochemical structures beneath Africa and the Pacific Ocean

Article Abstract:

The numerical models of thermochemical convection is presented in a three-dimensional spherical geometry using plate velocities inferred for the past 119 million years to show that Earth's subduction history leads to thermochemical structures similar in shape to the observed large, lower-mantle velocity anomalies. It was found that subduction history focused dense material into a ridge-like pile beneath Africa and a relatively more-rounded pile under the Pacific Ocean, consistent with seismic observations.

Environmental aspects, Convection (Meteorology), Atmospheric convection

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Foreshock sequences and short-term earthquakes predictability on East Pacific Rise transform faults

Article Abstract:

The records from a hydrocoustic array deployed by the National Oceanic and Atmospheric Administration show that East Pacific Rise transform faults have a low number of aftershocks and high foreshocks rates as compared to continental strike slip faults. The predictability that transforms earthquakes is consistent with a model in which slow slip transients trigger earthquakes, enrich their low frequency radiation, and accommodate much of the seismic plate motion.

United States, Observations, United States. National Oceanic and Atmospheric Administration

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A different kind of foreshock

Article Abstract:

Seismologists are unraveling the mysteries of earthquakes generation and testing the limits of predictions along remote fault zones. One of the efforts is done by McGuire that monitored seismicity along parts of the equatorial east Pacific rise and found the underwater sound recordings used to monitor fault in the equatorial Pacific.

Faults (Geology)

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