Makran Trench
The Makran Trench is the physiographic expression of a
Balochistan of Pakistan and the southeastern coast of Iran. In this region the oceanic crust of the Arabian Plate is being subducted beneath the continental crust of the Eurasian Plate
.
Tectonics
In the Makran region, the Arabian Plate subducts beneath the Eurasian Plate at ~2-4 cm/yr. This subduction is associated with an
Himalayan orogeny. The Makran Subduction Zone is often split into two segments: the east and west. The Sonne fault divides the two. [3] Though largely much quieter than many other subduction zones, studies reveal that the Makran Trench may be capable of very large earthquakes, even extending into the magnitude 9 range. [4]
Fluids, gas and mud volcanoes
The Makran accretionary complex is characterized by a number of features associated with escaping water and
Zalzala Jazeera) after the 2013 Balochistan earthquakes is thought to be the result of a mud volcano.[5] An island (Malan island) formed as a mud volcano subsided under water due to gas release and mud extrusion. Heavy rain from monsoon season built pressure to the aquifer, enhancing the release of gas.[6]
Earthquakes
- magnitude 8.1 event occurred on 28 November, causing a tsunamion the Makran coast.
- 5 August 1947: Mw 6.8 event just off the coast of western Pakistan
- 7 December 1989: Mw 6.0 event near the coast of southern Iran
- 7 February 2017: Mw 6.3 event just off the coast of western Pakistan
See also
References
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