The unique anisotropy of the Pacific upper mantle

Article Abstract:

Tomographic models of the Earth's mantle usually assume that fast and slow seismic velocity anomalies represent a spatially heterogeneous temperature field linked with mantle convection. A global three-dimensional tomographic model of shear-wave velocity is presented, showing that the uppermost mantle below the central Pacific Ocean is considerably complex. Regional anomalies in elastic anisotropy are revealed, producing seismic velocity variations.

Anisotropy, Tomography, Seismic waves

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Occurrence patterns of foreshocks to large earthquakes in the western United States

Article Abstract:

The occurrence of foreshocks prior to large earthquakes in the western US decreases with increasing depth of the mainshock. The foreshock occurrence depends on the mainshock slip orientation. Decrease in small-scale crustal heterogeneity with increasing depth is responsible for the shock patterns. The foreshock occurrence decreases with increasing normal stress. The earthquake nucleation process may have no affect on the mainshock size.

United States, Analysis, Natural disasters, Seismological research, Geodynamics

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Earthquake slip on oceanic transform faults

Article Abstract:

Research is presented concerning the study of body wave broadband seismograms to determine well-resolved rupture mechanisms and depths for 14 earthquakes which took place on the Chain and Romanche faults in the Atlantic Ocean.

Research, Models, Natural history, Earthquakes, Faults (Geology), Letter to the Editor, Atlantic Ocean, Mid-Atlantic Ridge

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