Seismicity and stress rotation in a granular model of the brittle crust

Article Abstract:

Numerical simulations of the deformation produced in a granular aggregate by compressive stress show elastodynamic faults and rotation of stresses along the shear zones similar to that seen during earthquakes. The simulations produce no friction and there are no changes in the pressure of the pore fluid. The model compares the Earth's crust to a collection of interlocking blocks interrupted by faults. This can be used to explain the mechanism of earthquake formation in the San Andreas fault, California, in the absence of friction.

Models, Usage, Observations, Numerical analysis, Earthquakes, Shear strength of soils, Soil shear strength

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Long-period volcano seismicity: its source and use in eruption forecasting

Article Abstract:

Long-period seismicity in active volcanos represents pressure fluctuations due to unsteady mass transport in the sub-surface plumbing system. This gives a general idea of the internal dynamics of the volcano. Seismicity at shallow levels could mean disruption in the steamy region of the volcano due to pressure. This could also be an indicator of an impending eruption. The advent of powerful computers contribute to the understanding of the macrophysics and microphysics of fluid flows.

Methods, Analysis, Volcanoes, Volcanic activity prediction

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Sensitivity of earthquake cycles on the San Andreas fault to small changes in regional compression

Article Abstract:

Scientists have simulated seismic activity on the San Andreas fault system in the San Francisco Bay area to demonstrate the critical nature and sensitivity of its current state. The research shows that small regional compression decreases would be enough to affect the fault and allow co-seismic slip. Plate convergence and thrust faulting in the Coast Ranges may impact sensitive regional stress fields and spark off major earthquakes on the San Andreas fault line.

Environmental aspects, Seismology, Seismometry

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