An earthquake is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from those that are so weak that they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time period. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. The word tremor is also used for non-earthquake seismic rumbling.
Tajikistan is nestled between Kyrgyzstan and Uzbekistan to the north and west, China to the east, and Afghanistan to the south. Mountains cover 93 percent of Tajikistan's surface area. The two principal ranges, the Pamir Mountains and the Alay Mountains, give rise to many glacier-fed streams and rivers, which have been used to irrigate farmlands since ancient times. Central Asia's other major mountain range, the Tian Shan, skirts northern Tajikistan. Mountainous terrain separates Tajikistan's two population centers, which are in the lowlands of the southern and northern sections of the country. Especially in areas of intensive agricultural and industrial activity, the Soviet Union's natural resource utilization policies left independent Tajikistan with a legacy of environmental problems.
Sarez Lake is a lake in Rushon District of Gorno-Badakhshan province, Tajikistan. Length about 75.8 kilometres (47.1 mi), depth few hundred meters, water surface elevation about 3,263 metres (10,705 ft) above sea level and volume of water is more than 16 cubic kilometres (3.8 cu mi). The mountains around rise more than 2,300 metres (7,500 ft) above the lake level.
The M41, known informally and more commonly as the Pamir Highway is a road traversing the Pamir Mountains through Afghanistan, Uzbekistan, Tajikistan and Kyrgyzstan with a length of over 1,200 km. It is the only continuous route through the difficult terrain of the mountains and is the main supply route to Tajikistan's Gorno-Badakhshan Autonomous Region. The route has been in use for millennia, as there are a limited number of viable routes through the high Pamir Mountains. The road formed one link of the ancient Silk Road trade route. M41 is the Soviet road number, but no road number is generally signposted along the road today, only destinations.
The Bartang is a river of Central Asia, tributary to the Panj and consequently to the Amu Darya. In its upper reaches, it is also known as the Murghab and Aksu; it flows through the Wakhan in Afghanistan, then through the Rushon District of the Gorno-Badakhshan autonomous region, Tajikistan. The river is 528 kilometres (328 mi) long and has a basin area of 24,700 square kilometres (9,500 sq mi).
The Usoi Dam is a natural landslide dam along the Murghab River in Tajikistan. At 567 metres (1,860 ft) high, it is the tallest dam in the world, either natural or man-made. The dam was created on February 18, 1911, when the 7.4-Ms Sarez earthquake caused a massive landslide that blocked the flow of the river.
Rushon District is a district in east Tajikistan, in the west-central part of the Gorno-Badakhshan Autonomous Region (GBAO). It stretches along the river Bartang between the Yazgulem Range to the north and the Rushon Range to the south. Its capital is Rushon, also known as Vomar, situated on the border with Afghanistan, 65 km north of Khorugh along the river Panj and the Pamir Highway. The population of Rushon district is 25,800.
A landslide dam or barrier lake is the natural damming of a river by some kind of landslide, such as a debris flow, rock avalanche or volcanic eruption. If the damming landslide is caused by an earthquake, it may also be called a quake lake. Some landslide dams are as high as the largest existing artificial dam.
The 1975 Kinnaur earthquake occurred in the early afternoon of 19 January. It had a magnitude of 6.8 on the surface wave magnitude scale and a maximum perceived intensity of IX (Violent) on the Mercalli intensity scale, causing extensive damage in Himachal Pradesh, in northern India. Its epicentre was in Kinnaur district in the southeastern part of Himachal Pradesh and caused 47 casualties. Landslides, rock falls and avalanches caused major damage to the Hindustan-Tibet Road. The earthquake affected many monasteries and buildings in the state and led to an extensive restoration work in the late 1970s and early 1980s in Himachal Pradesh. The Spiti and Parachu valleys in particular suffered the greatest damage being on the north–south Kaurik-Chango fault, causing damage to landmarks such as Key Monastery and Tabo Monastery.
The 1929 Murchison earthquake occurred at 10:17 am on 17 June. It struck the Murchison region of the South Island, with an estimated magnitude of 7.3, and was felt throughout New Zealand. There were 17 deaths, mostly as a result of landslides triggered by the earthquake. The rumbling sound of the earthquake was loud enough to be heard at New Plymouth, more than 250 km (155 mi) away.
The 1949 Khait (Hoit) earthquake occurred at 09:45 local time on 10 July in the Gharm Oblast region of the Tajik SSR of the Soviet Union. It had a magnitude of 7.5 and triggered a series of landslides that together led to 7,200 deaths.
An earthquake occurred on 1 June 1786 in and around Kangding, in what is now China's Sichuan province. It had an estimated magnitude of about 7.75 and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. The initial quake killed 435 people. After an aftershock ten days later, a further 100,000 died when a landslide dam collapsed across the Dadu river.
Earthquake environmental effects are the effects caused by an earthquake, including surface faulting, tsunamis, soil liquefactions, ground resonance, landslides and ground failure, either directly linked to the earthquake source or provoked by the ground shaking. These are common features produced both in the near and far fields, routinely recorded and surveyed in recent events, very often remembered in historical accounts and preserved in the stratigraphic record. Both surface deformation and faulting and shaking-related geological effects not only leave permanent imprints in the environment, but also dramatically affect human structures. Moreover, underwater fault ruptures and seismically-triggered landslides can generate tsunami waves.
On December 7, 2015, an earthquake measuring 7.2 on the moment magnitude scale struck Tajikistan 105 km (65 mi) west of Murghab at 07:50 UTC at a depth of 26.0 km (16.2 mi). The earthquake was also felt in neighboring Xinjiang in China, India, Afghanistan, Pakistan and Kyrgyzstan.
On November 2 of 1946, west Kyrgyzstan was struck by a magnitude 7.5–7.6 earthquake, the largest in the republic since 1911. The earthquake's hypocenter is probably located beneath the Tian Shan Mountains, near the border with Uzbekistan and north of Namangan.
The 1139 Ganja earthquake is one of the worst seismic events in history. It affected the Seljuk Empire and Kingdom of Georgia; modern-day Azerbaijan and Georgia. The earthquake had an estimated magnitude of 7.7 , 7.5 and 7.0–7.3 . A controversial death toll of 230,000–300,000 came as a consequence of this event.
The 1889 Chilik earthquake occurred on July 11 on the Gregorian calendar, or June 30 on the Julian calendar at 15:14 local time in the Tien Shan mountains. The earthquake measured an estimated Mw 7.9–8.0 on the moment magnitude scale and was assigned a maximum intensity of X (Devastating) on the MSK 64 and Rossi-Forel scales. Over 92 people across Kazakhstan, Kyrgyzstan and China were killed.
On July 10 2021, a 5.7 magnitude earthquake struck 20 km southeast of the Rasht Valley in Tajikistan.
The 1983 Hindu Kush earthquake occurred south of Fayzabad, Badakhshan in northeast Afghanistan, near the border with Pakistan and the USSR. Striking 214.5 km beneath the Hindu Kush mountains, the moment magnitude 7.4 quake affected three countries, killing at least 26 people and injuring several hundred.
The Lenin Peak disaster occurred on 13 July 1990 when 43 climbers were killed during an avalanche on the 7,134-meter-high mountain peak in northeast Tajikistan and Kyrgyzstan. The deadly avalanche was triggered by a moment magnitude scale 6.4 earthquake which struck at a depth of 216.8 km beneath the Hindu Kush mountains in neighbouring Afghanistan. The incident is believed to be the deadliest mountaineering disaster in history.
