U.S.G.S.
The earthquake that struck Turkey on October 23, 2011, had a magnitude of 7.3.
2011 · 1 pages

Abstract
The epicenter was located in the Van Province, with the earthquake occurring at 10:41:21 UTC. The affected regions included Turkey, Iran, Armenia, Azerbaijan, and Iraq. The earthquake's impact was significant, with widespread damage reported in several provinces. The Modified Mercalli (MMI) Intensity Scale was used to estimate the extent of shaking intensity and affected populations. According to the scale, the MMI intensity ranged from 5 to 10, with the majority of the damage occurring in areas with an MMI intensity of 7 or higher. The estimated population exposed to shaking was approximately 9,345,000 people, with the majority living in the provinces of Van, Mus, and Bitlis. The affected areas included the cities of Van, Mus, Igdir, Siirt, Sirnak, and Bitlis, as well as the surrounding rural areas. The USGS provided assistance to Turkey in the aftermath of the earthquake, including logistics and emergency relief supplies. The International Federation of Red Cross and Red Crescent Societies (IFRC) and the US Agency for International Development's Office of U.S. Foreign Disaster Assistance (USAID/OFDA) also provided support to the affected areas. The earthquake's impact was further exacerbated by the presence of several lakes and rivers in the affected region, including Lake Van, the Murat Nehri, and the Tigris River. The earthquake also caused significant damage to the surrounding landscape, including the Mount Ararat region. The estimated MMI intensity and affected populations were as follows: - MMI intensity 5: 482,000 people - MMI intensity 6: 265,000 people - MMI intensity 7: 67,000 people - MMI intensity 8: 377,000 people - MMI intensity 9: 29,000 people - MMI intensity 10: 9,345,000 people The earthquake's impact was significant, with widespread damage reported in several provinces. The affected regions included Turkey, Iran, Armenia, Azerbaijan, and Iraq.
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USAID DEC