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Research may explain mysterious deep earthquakes in subduction zones

Earthquakes that happen deep beneath the earth’s surface have long been enigmatic to geologists. Now researchers from Brown University have shown strong evidence that water squeezed out of a mineral called lawsonite could trigger these mysterious quakes.

PROVIDENCE, R.I. [Brown University] — Geologists from Brown University may have finally explained what triggers certain earthquakes that occur deep beneath the Earth’s surface in subduction zones, regions where one tectonic plate slides beneath another. (more…)

Scientists Study Earthquake Triggers in Pacific Ocean

By Guest PostJuly 2, 2011Environmentaccretionary margins, alaska to patagonia, basalt rock, costa rica, costa rica seismogenesis project, crisp, earthquake generating region, earthquakes, eastern pacific ocean, expedition, fault, global earthquakes, integrated ocean drilling program, iodp, italy, Japan, joides resolution, kohtaro ujiie, kristin hillis, large earthquakes, marianas, masaoki uno, mass transfer, michael stipp, nankai trough seismogenic zone experiment, nantroseize, national science foundation, nsf, pacific northwest, paola vannucchi, plate boundary, rodey batiza, samples of rock and sediment, scientific drilling vessel, seafloor, seismic plate boundary, seismogenic region, subduction processes, subduction zones, subseafloor, sumatra quakes, tectonic activity, the aleutians, tohoku earthquake, understanding of the earth, university of florence, university of tsukuba

*Samples of rock, sediment from beneath the sea-floor help explain quakes like Japan’s*

New samples of rock and sediment from the depths of the eastern Pacific Ocean may help explain the cause of large, destructive earthquakes similar to the Tohoku Earthquake that struck Japan in mid-March.

Nearly 1,500 meters (almost one mile) of sediment cores collected from the ocean floor off the coast of Costa Rica reveal detailed records of some two million years of tectonic activity along a seismic plate boundary. (more…)

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Research may explain mysterious deep earthquakes in subduction zones

Scientists Study Earthquake Triggers in Pacific Ocean