Rift Owen. A series of earthquakes and the possible consequences

 

2011-10-26 20:31:45 4.9 14.30 ° N 53.97 ° E 10 M Owen Fracture Zone Region

2011-10-26 19:54:08 4.5 14.75 ° N 53.36 ° E 10 M Owen Fracture Zone Region

2011-10-26 19:38:17 4.4 14.22 ° N 53.66 ° E 10 M Owen Fracture Zone Region

It is still unknown active fault system in the Indian Ocean is between the border of Indian and Arabian plates. French group of researchers discovered 800-kilometer-long break, he is still active and often causes massive landslides. Therefore, the risk of earthquakes and tsunamis in the Indian Ocean should be evaluated in a new, geologists concluded in the journal «Earth and Planetary Science Letters».

The theory of plate tectonics, the Alfred Wegener finally from 1960 became a scientist, and the "joints" of the Earth's crust — the subject of intensive research. Today, plate boundaries, which are formed along the volcanoes and earthquakes are almost under constant surveillance. And yet, there are still areas that are either too quiet or too elusive to be research.

Such a "white spot" on the map of specialists is joint Indian and Arabian plates. Both platforms slide against each other, the so-called Owen (Owen) fault, in the Indian Ocean. This zone is characterized by low seismicity and fold, rising to 2,000 meters above the ocean floor. Arabian plate is moving a little faster than the Indian, with a rate of 2 to 4 millimeters per year in the north.

800-kilometer gap system

Thanks expedition «Owen», in 2009, a team of researchers of the Institute of Earth Sciences in Paris (iSTeP), CNRS Laboratory of Geology and Research Centre Géoazur, to precisely define the boundary between the Arabian and Indian Plate. The researchers relied on during diplotene (Lot arranged to measure the great depth — approx. Translator) In the deep zone of the sea aboard the research vessel Beautemps Beaupre.

Bathymetry (the collection of data on the depth in the area of research — prim.perevodchika) Revealed hitherto unknown system fault, which extends more than 800 km to the north-west of the Indian Ocean. It was also revealed that the high ridge overlooking Owen forms a boundary of the original plates, and is a group of active motion segments, which interrupted a few bends.

Landslides confirm the high activity
and increased risk of tsunami

Striking: While Indus carries large amounts of sediment from the Himalayas to the Indian Ocean, the fault is not covered by sediments and can be 100 kilometers freely explored. According to the researchers — a sign of the current tectonic activity in this area. Especially on the west side of Owen Ridge, where there are many traces of landslides, which were probably caused by earthquakes along the fault Owen. They are the potential source of the tsunami on the coast of neighboring Oman.

Source: planeta.moy.su.

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