Not exact matches
The time history of quasi-static slip along the
plate interface, based on small repeating earthquakes that were part of the migrating seismicity, suggests that two sequences involved slow - slip transients propagating toward the initial
rupture point.
The January quake was the result of a new
rupture that allowed the
plate to stretch and thin to compensate (Nature, vol 451, p 561; and see diagram).
«This was an event the thrust interface of the
plate boundary system, confirming that there is a subduction system in the Haida Gwaii area,» said Honn Kao, seismologist with the Geological Survey of Canada, who, along with his colleagues, examined the source parameters — causative faults,
rupture processes and depths — of the mainshock and sequence of strong aftershocks.
The aftershocks clustered around the periphery of the
rupture zone, both on the seaward and landward side of the
plate boundary and reflected normal faulting behavior — caused by the bending, extending or stretching of rock — rather than the thrust faulting of the mainshock.
Other recent large
plate boundary
ruptures bound the possible
rupture area of the April 1 event, including the 2001 M 8.4 Peru earthquake adjacent to the south coast of Peru to the north, and the 2007 M 7.7 Tocopilla, Chile and 1995 M 8.1 Antofagasta, Chile earthquakes to the south.
Seismologist Kevin McCue, who runs a company called the Australian Seismological Centre in Canberra, says this
plate boundary «doesn't seem to have been activated by the Sendai
rupture».
The
ruptured fault is not along the tectonic
plate boundaries where major quakes are expected.
He also worries that today's quake might increase stress on the
plate boundaries, where a
rupture could produce a magnitude - 8 earthquake.
This work presents a conceptual model in which strain is released by temporally clustered great - earthquakes that
rupture faults within the upper -
plate as opposed to the zone where the tectonic
plates meet (
plate - interface).
To find out how such a large slip — greater than 50 metres in places — happened, seismologists on board Japan's deep - sea research vessel Chikyu drilled boreholes nearly 850 metres deep into the seabed around the
plate boundary that
ruptured in 2011.
In a 2006 paper in Science, researchers — including David Robinson, then a seismologist at the University of Oxford in the United Kingdom — noted that the June 2001 in Peru quake
ruptured only 400 km of the 1000 - km - long seismic gap, leaving 600 km of the
plate boundary largely locked.
In both subduction zones, the converging
plates are thought to be accumulating strain which could be released in a very large and violent
rupture.
Much of the
rupture was along a region with very limited
plate convergence.
But this
rupture began 70 kilometers down, within the Cocos
plate itself, and rose up before stopping at about 40 kilometers» depth, likely at the
plate interface.
These forces do not simply move the
plates around, they can also cause
plates to
rupture, forming a rift and potentially leading to the creation of new
plate boundaries.
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Very large and giant breed dogs spayed or neutered prior to growth
plate closure may develop longer, straighter back legs that can predispose them to athletic injuries like cruciate
rupture.
In Los Angeles painter Mark Grotjahn's suave strokes of frozen color, «bands and chevrons jostle for control of the surface plane like fractured tectonic
plates poised to
rupture...» according to essayist Gary Garrels.
Frederick W. Taylor, Richard W. Briggs, Cliff Frohlich, Abel Brown, Matthew Hornbach, Alison K. Papabatu, Aron Meltzner, Douglas Billy, «The 1 April 2007 Solomons Earthquake: Shallow
Rupture Across a Ridge - Transform
Plate Boundary» Nature Geoscience, 2008.