Indian Ocean earthquake hint at a tectonic rift

Indian OceanOne more strong earthquakes that occurred in the Indian Ocean, April 11, 2012, may signal the final stage of formation of a new boundary between lithospheric plates.

Geological stress, tearing of the Indo-Australian plate, most likely, was the cause of earthquakes of magnitude 8.6 and 8.2, which are passed along numerous faults. Tremors continued for six days thereafter.

In April of the 2012 Indo-Australian plate simultaneously exploded at least four fault, resulting in two hours was two earthquakes with magnitude above 8.0. (Red stars indicate the epicenters.) (Image Keith Koper / University of Utah Seismograph Stations.)

Their views on this matter experts presented in the journal Nature in three articles.

The hypothesis of the destruction of the Indo-Australian plate there since the 1980’s. Earthquake on April 11 were the most vivid evidence of righteousness seismologists emphasizes Matthias Delescluze of the Ecole Normale Superieure in Paris (France), lead author of the first article.

According to the prevailing theory of plate tectonics, the Indo-Australian plate began to deform around 10 million years ago. The fact that she is moving to the north, but it inhibits the Eurasian plate. In a clash not only created the Himalayas, but also slows down the Indian part of the plate. Meanwhile, in the last part of the Australian settle, hence the tension?

Group Mr. Delescluze identified stress simulation, performed shortly before the earthquake of 2012. Scientists have discovered that the two previous push near the eastern boundary of plates (magnitude 9.1 earthquakes in 2004 that caused the tsunami disaster, and another one in 2005) is likely to become the direct cause of the recent events, but by themselves they can not cause further tremors. There must be some additional source of stress. Apparently, those earthquakes only increase tension in the middle of the platform.

Most large earthquake occurs when two plates collide and come one after another. In contrast, when the platform or parts slide horizontally along the fault line, it usually results in less shear shock. However, the first earthquake on April 11 challenged the theory, once the largest strike-slip earthquake in the history of observations and one of the best that occurred away from plate boundaries.

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