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October 2009 Afghanistan earthquake

UTC time	2009-10-22 19:51:27
ISC event	15928545
USGS-ANSS	ComCat
Local date	23 October 2009 (2009-10-23)
Local time	00:21:27
Magnitude	6.2 Mw
Depth	185.9 km (116 mi)
Epicenter	36°31′01″N 70°57′00″E / 36.517°N 70.950°E / 36.517; 70.950
Type	Dip-slip (reverse)
Areas affected	Afghanistan Pakistan
Max. intensity	MMI V (Moderate)
Landslides	Yes
Casualties	5 deaths

A 6.2 magnitude earthquake occurred in Afghanistan on October 22, 2009, at 19:51:27 UTC. The maximum Mercalli intensity was V (Moderate) at Fayzabad, Badakhshan.

Tectonic setting

The ongoing continental collision between the Indian plate and Eurasian plate results in tectonic uplift, forming the Himalaya, Hindu Kush and Pamir Mountains. The two plates collide along a convergent plate boundary which includes the Main Himalayan Thrust. Broad crustal deformation caused by the Indian plate ploughing into Eurasia causes uplift within the interior of Asia. This action created the Tibetan Plateau. Shallow earthquakes occur on faults that accommodate the tectonic stresses caused by the collision. Some of the largest earthquakes have exceeded magnitude 8.0, while even moderately large 6.0 events have resulted in thousands of fatalities. Most of these earthquakes are associated with reverse, thrust or strike-slip faulting. Large earthquakes with magnitudes of up to 7.5 have occurred in the region with an average recurrence interval of 15 years. These earthquakes correspond to reverse faulting at a depth of 170 to 280 km. These earthquakes rather than occurring at a plate boundary, are sourced from within the Indian plate as it dives beneath the Hindu Kush. As the tectonic slab of the Indian plate descends at a near-vertical angle into the mantle, it stretches and begins to "tear", eventually leading to a slab detachment. This action results in stress accommodation along faults that produces earthquakes when ruptured.

Earthquake

This was a relatively deep shock with a reverse focal mechanism. The quake was widely felt in both Pakistan and Afghanistan, it was felt in areas such as Karachi, Kabul and Islamabad.

Casualties

Landslides killed three people and two others suffered fatal heart attacks in Mirpur, Pakistan.

See also

• List of earthquakes in 2009
• List of earthquakes in Afghanistan

References

1. Zoya Zarifi; Jens Havskov (2003). "Characteristics of dense nests of deep and intermediate-depth seismicity" (PDF). Advances in Geophysics. 46: 237–278. Bibcode:2003AdGeo..46..237Z. doi:10.1016/S0065-2687(03)46004-4. ISBN 9780120188468.
2. Sofia-Katerina Kufner; Najibullah Kakar; Maximiliano Bezada; Wasja Bloch; Sabrina Metzger; Xiaohui Yuan; James Mechie; Lothar Ratschbacher; Shokhruhk Murodkulov; Zhiguo Deng; Bernd Schurr (2021). "The Hindu Kush slab break-off as revealed by deep structure and crustal deformation". Nature Communications. 12 (1685). Nature: 1685. Bibcode:2021NatCo..12.1685K. doi:10.1038/s41467-021-21760-w. PMC 7966371. PMID 33727553.
3. ^ "M6.2 – Hindu Kush region, Afghanistan". United States Geological Survey.
4. "Quake shakes Pakistan, Afghanistan". english.aljazeera.net. Al Jazeera. Archived from the original on October 24, 2009. Retrieved March 16, 2022.

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