mega earthquakes - TSUMAPS NEAM

The stronger shallower segment strains and stresses the deeper segment of the seismogenic zone. The deeper segment is weaker and fails at lower stress build-up in 2016-class earthquakes. Higher shear strength along the shallow segment allows longer periods (>110 yr) of stress build-up, the release of which may result in great 1960-class earthquakes that can also extend into the deeper segment. Interseismic GPS velocities indicate high crustal shortening above the deeper section of the seismogenic zone (right inset). Pore fluid pressure gradients along the plate interface are related to the geological configuration of the margin, and exert a mechanical control on the strength segmentation and timing of stress release in the seismogenic zone (left inset). 'Chilean megathrust earthquake recurrence linked to frictional contrast at depth', Nature Science, DOI 10.1038/s41561-018-0089-5 (Credit: M. Moreno; Nature Geoscience / SPRINGER NATURE)

Aquaplaning in the geological underground

September 13, 2018 tsumapsneam mega earthquakes, water pressure

The 2016 Mw 7.6 earthquake of Southern Chile was the first large earthquake to occur within the rupture bounds of

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