On 7 December 2015, an earthquake measuring 7.2 on the

moment magnitude scale The moment magnitude scale (MMS; denoted explicitly with or Mwg, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. was defined in a 1979 paper ...

struck Tajikistan west of Murghab at 07:50

UTC Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communica ...

at a depth of . The earthquake was also felt in neighboring

Xinjiang Xinjiang,; , SASM/GNC romanization, SASM/GNC: Chinese postal romanization, previously romanized as Sinkiang, officially the Xinjiang Uygur Autonomous Region (XUAR), is an Autonomous regions of China, autonomous region of the China, People' ...

in China, India, Afghanistan, Pakistan and Kyrgyzstan. The earthquake was felt with intensities of MMI IV in

Islamabad Islamabad (; , ; ) is the capital city of Pakistan. It is the country's tenth-most populous city with a population of over 1.1 million and is federally administered by the Pakistani government as part of the Islamabad Capital Territory. Bu ...

Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country# ...

, MMI IV in

New Delhi New Delhi (; ) is the Capital city, capital of India and a part of the Delhi, National Capital Territory of Delhi (NCT). New Delhi is the seat of all three branches of the Government of India, hosting the Rashtrapati Bhavan, New Parliament ...

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

, MMI IV in

Kashgar Kashgar () or Kashi ( zh, c=喀什) is a city in the Tarim Basin region of southern Xinjiang, China. It is one of the westernmost cities of China, located near the country's border with Kyrgyzstan and Tajikistan. For over 2,000 years, Kashgar ...

, China, MMI II in

Dushanbe Dushanbe is the Capital city, capital and largest city of Tajikistan. , Dushanbe had a population of 1,564,700, with this population being largely Tajiks, Tajik. Until 1929, the city was known in Russian as Dyushambe, and from 1929 to 1961 as St ...

, Tajikistan, MMI II in

Kabul Kabul is the capital and largest city of Afghanistan. Located in the eastern half of the country, it is also a municipality, forming part of the Kabul Province. The city is divided for administration into #Districts, 22 municipal districts. A ...

Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan, is a landlocked country located at the crossroads of Central Asia and South Asia. It is bordered by Pakistan to the Durand Line, east and south, Iran to the Afghanistan–Iran borde ...

, MMI III in

Tashkent Tashkent (), also known as Toshkent, is the Capital city, capital and List of cities in Uzbekistan, largest city of Uzbekistan. It is the most populous city in Central Asia, with a population of more than 3 million people as of April 1, 2024. I ...

Uzbekistan , image_flag = Flag of Uzbekistan.svg , image_coat = Emblem of Uzbekistan.svg , symbol_type = Emblem of Uzbekistan, Emblem , national_anthem = "State Anthem of Uzbekistan, State Anthem of the Republ ...

, MMI III in

Bishkek Bishkek, formerly known as Pishpek (until 1926), and then Frunze (1926–1991), is the Capital city, capital and largest city of Kyrgyzstan. Bishkek is also the administrative centre of the Chüy Region. Bishkek is situated near the Kazakhstan ...

Kyrgyzstan Kyrgyzstan, officially the Kyrgyz Republic, is a landlocked country in Central Asia lying in the Tian Shan and Pamir Mountains, Pamir mountain ranges. Bishkek is the Capital city, capital and List of cities in Kyrgyzstan, largest city. Kyrgyz ...

, and MMI II in

Almaty Almaty, formerly Alma-Ata, is the List of most populous cities in Kazakhstan, largest city in Kazakhstan, with a population exceeding two million residents within its metropolitan area. Located in the foothills of the Trans-Ili Alatau mountains ...

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a landlocked country primarily in Central Asia, with a European Kazakhstan, small portion in Eastern Europe. It borders Russia to the Kazakhstan–Russia border, north and west, China to th ...

. A truck driver and a policeman were killed while dozens more were injured and 500 homes destroyed. The epicentre of this quake was approximately distant from the epicentre of the M7.3

1911 Sarez earthquake The 1911 Sarez earthquake occurred at 18:41 Coordinated universal time, UTC on 18 February (23:31 local time) in the central Pamir Mountains in the Rushon District of eastern Tajikistan (then part of the Russian Empire). It had an estimated magn ...

which formed the

Usoi Dam The Usoi Dam is a natural landslide dam along the Murghab River (Tajikistan), Murghab River in Tajikistan. At high, it is the tallest dam in the world, either natural or man-made. The dam was created on 18 February 1911, when the 7.4-Surface wav ...

across the

Murghab river The Marghab River (Dari/Pashto: مرغاب, ''Murghāb'', Balochi: مرگاپ), anciently the Margiana (Ancient Greek: Μαργιανή, ''Margianḗ''), is an long river in Central Asia. It rises in the Paropamisus Mountains (''Selseleh-ye Sa ...

Tectonic setting

The eastern part of Tajikistan (the

Pamir Mountains The Pamir Mountains are a Mountain range, range of mountains between Central Asia and South Asia. They are located at a junction with other notable mountains, namely the Tian Shan, Karakoram, Kunlun Mountains, Kunlun, Hindu Kush and the Himalaya ...

) lies within the complex zone of collision between the

Indian plate The Indian plate (or India plate) is or was a minor tectonic plate straddling the equator in the Eastern Hemisphere. Originally a part of the ancient continent of Gondwana, the Indian plate broke away from the other fragments of Gondwana an ...

and the Eurasian plate. The dominant structures in this area are a combination of

thrust fault A thrust fault is a break in the Earth's crust, across which older rocks are pushed above younger rocks. Thrust geometry and nomenclature Reverse faults A thrust fault is a type of reverse fault that has a dip of 45 degrees or less. I ...

s and sinistral (left lateral) strike-slip faults. The Sarez–Karakul fault zone is a major SW–NE trending sinistral strike-slip fault that extends from south of

Sarez Lake Sarez Lake ( ) is a lake in Rushon District of Gorno-Badakhshan province, Tajikistan. Its length is about , its depth about a few hundred meters, its water surface elevation about above sea level, and volume of water over . The mountains around ...

to north of Karakul lake. The 1911 earthquake is thought to have been caused by movement on this structure.

Earthquake

Based on observations of ground rupture from SAR interferometry, the earthquake ruptured a 79 km section of the Sarez–Karakul fault zone. This is consistent with the observed distribution of

aftershock In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in Epicenter, the same area of the Mainshock, main shock, caused as the displaced Crust (geology), crust adjusts to the effects of the main shock. Large earthq ...

s and the

focal mechanism The focal mechanism of an earthquake describes the Fault (geology)#Slip.2C heave.2C throw, deformation in the Hypocenter, source region that generates the seismic waves. In the case of a Fault (geology), fault-related event, it refers to the ori ...

. Three separate segments were involved, consisting of two longer SW–NE trending segments linked by a shorter more WSW–ENE trending patch forming a restraining bend. The

hypocenter A hypocenter or hypocentre (), also called ground zero or surface zero, is the point on the Earth's surface directly below a nuclear explosion, meteor air burst, or other mid-air explosion. In seismology, the hypocenter of an earthquake is its ...

is located within the southwesternmost segment. The earthquake's detailed rupture history has been determined using a backprojection method using teleseismic data from stations in the European seismic network. Analysis has shown that the rupture propagated to the northeast initially at speeds below the

S wave __NOTOC__ In seismology and other areas involving elastic waves, S waves, secondary waves, or shear waves (sometimes called elastic S waves) are a type of elastic wave and are one of the two main types of elastic body waves, so named because t ...

velocity (subshear), but jumping to supershear speeds. At the restraining bend it slowed to subshear speeds before accelerating again to supershear speeds on the third segment.

References

External links

* {{Earthquakes in 2015

2015 2015 was designated by the United Nations as: * International Year of Light * International Year of Soil __TOC__ Events January * January 1 – Lithuania officially adopts the euro as its currency, replacing the litas, and becomes ...

Tajikistan Tajikistan, officially the Republic of Tajikistan, is a landlocked country in Central Asia. Dushanbe is the capital city, capital and most populous city. Tajikistan borders Afghanistan to the Afghanistan–Tajikistan border, south, Uzbekistan to ...

Earthquake An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they ...

Tajikistan earthquake Tajikistan 2015

Tectonic setting

Earthquake

See also

References

External links