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Main Himalayan Thrust
The Main Himalayan Thrust (MHT) is a décollement under the Himalaya Range. This thrust fault follows a NW-SE strike, reminiscent of an arc, and gently dip towards the north, beneath the region. It is the largest active continental megathrust fault in the world. Overview The MHT accommodates crustal shortening of India and Eurasia as a result of the ongoing collision between the Indian and Eurasian plates. Deformation of the crust is also accommodated along splay structures including the Main Frontal Thrust (MFT), Main Boundary Thrust (MBT), Main Central Thrust (MCT) and possibly the South Tibetan Detachment. The MHT is the root detachment of these splays. At this present moment, the MFT and MHT accounts for almost the entire rate of convergence (15-21 mm/yr). This fault defines where the India subcontinent is underthrust beneath the Himalayan orogenic wedge. In April 2015, a section of the MHT produced a blind rupture earthquake, killing nearly 9,000 Nepalese. Associa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. If the angle of the fault plane is lower (often less than 15 degrees from the horizontal) and the displacement of the overlying block is large (often in the kilometer range) the fault is called an ''overthrust'' or ''overthrust fault''. Erosion can remove part of the overlying block, creating a ''fenster'' (or ''window'') – when the underlying block is exposed only in a relatively small area. When erosion removes most of the overlying block, leaving island-like remnants resting on the lower block, the remnants are called ''klippen'' (singular ''klippe''). Blind thrust faults If the fault plane terminates before it reaches the Earth's surface, it is referred to as a ''blind thrust'' fault. Because of the lack of surface evidence, blind thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Modified Mercalli Intensity Scale
The Modified Mercalli intensity scale (MM, MMI, or MCS), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the effects of an earthquake at a given location, distinguished from the earthquake's inherent force or strength as measured by seismic magnitude scales (such as the "" magnitude usually reported for an earthquake). While shaking is caused by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is radiated as seismic waves. Deeper earthquakes also have less interaction with the surface, and their energy is spread out across a larger volume. Shaking intensity is localized, generally diminishing with distance from the earthquake's epicenter, but can be amplified in sedimentary basins and certain kinds of unconsolidated soils. Intensity scales empirically categorize the intensity of shaking based on the effect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1991 Uttarkashi Earthquake
The 1991 Uttarkashi earthquake (also known as the Garhwal earthquake) occurred at 02:53:16 Indian Standard Time ( UTC+05:30) on 20 October with a moment magnitude of 6.8 and a maximum Mercalli intensity of IX (''Violent''). This thrust event was instrumentally recorded and occurred along the Main Central Thrust in the Uttarkashi and Gharwal regions of the Indian state of Uttarakhand (then still part of Uttar Pradesh). High intensity shaking resulted in the deaths of at least 768 people and the destruction of thousands of homes. Tectonic setting The Garhwal division in northern India, flanked by the Tons River to the west and the Alaknanda River to the east, is located at the boundary of the Indian and Eurasian tectonic plates. In the region, the Indian Plate is moving northeastward at a rate of per year. The Main Central Thrust is the primary northwest-striking structure and dips to the north at 30–40°. The fault plane solutions from the parametric catalogs for the 1991 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1988 Nepal Earthquake
The 1988 Nepal earthquake ( ne, विसं २०४५ को भूकम्प) occurred in Nepal near the Indian border and affected much of northern Bihar. The magnitude 6.9 earthquake shook the region on August 21, killing at least 709 persons and injuring thousands. The earthquake struck in two installments of 10 seconds and 15 seconds each and left cracks in 50,000 buildings, including Raj Bhavan and the old Secretariat Building in Patna, Bihar. See also *List of earthquakes in 1988 *List of earthquakes in India *List of earthquakes in Nepal References External links M6.9 - Nepal-India border region– United States Geological Survey Earthquakes in Bihar, India– Amateur Seismic Centre * {{DEFAULTSORT:Nepal Earthquake, 1988 1988 Nepal Earthquake, 1988 1988 1988 earthquakes Natural disasters in Bihar Earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1980 Nepal Earthquake
The 1980 Nepal earthquake devastated the Nepal–India border region on the evening of July 29. The epicenter of the 6.6 earthquake was located in Nepal, northwest of Khaptad National Park. At least 200 people died and 5,600 were injured in the disaster. Extensive damage occurred on both sides of the border, amounting to 245 million USD (828.9 million in 2022). Tectonic setting The Himalaya is located at the convergent boundary where active convergence leads to continental collision. The India and Eurasian plates began colliding approximately 50 million years ago when the Tethys Ocean closed. The Main Himalayan Thrust (MHT), a decollement structure, defines the boundary between the Indian Plate and Eurasian Plate. The convergent zone also contains three other major faults; the Main Boundary Thrust (MBT), Main Central Thrust (MCT) and South Tibetan Detachment (STD). At the surface, the Main Himalayan Thrust propagates along the Main Frontal Thrust. These faults runs for approxi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1966 Nepal Earthquake
Events January * January 1 – In a coup, Colonel Jean-Bédel Bokassa takes over as military ruler of the Central African Republic, ousting President David Dacko. * January 3 – 1966 Upper Voltan coup d'état: President Maurice Yaméogo is deposed by a military coup in the Republic of Upper Volta (modern-day Burkina Faso). * January 10 ** Pakistani–Indian peace negotiations end successfully with the signing of the Tashkent Declaration, a day before the sudden death of Indian prime minister Lal Bahadur Shastri. ** Georgia House of Representatives, The House of Representatives of the US state of Georgia refuses to allow African-American representative Julian Bond to take his seat, because of his anti-war stance. ** A Commonwealth Prime Ministers' Conference convenes in Lagos, Nigeria, primarily to discuss Rhodesia. * January 12 – United States President Lyndon Johnson states that the United States should stay in South Vietnam until Communism, Communist aggression there is e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1950 Assam–Tibet Earthquake
The 1950 Assam–Tibet earthquake, also known as the Assam earthquake, occurred on 15 August and had a moment magnitude of 8.6. The epicentre was located in the Mishmi Hills in India, known in Chinese as the Qilinggong Mountains (), south of the Kangri Karpo and just east of the Himalayas in the North-East Frontier Agency part of Assam, India. This area, south of the McMahon Line and now known as Arunachal Pradesh, is today disputed between China and India. It is the strongest earthquake ever recorded on land. Occurring on a Tuesday evening at 7:39 pm Indian Standard Time, the earthquake was destructive in both Assam (India) and Tibet (China), and approximately 4,800 people were killed. The earthquake is notable as being the largest recorded quake caused by continental collision rather than subduction, and is also notable for the loud noises produced by the quake and reported throughout the region. Geology In an attempt to further uncover the seismic history of Northeast Ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1947 Assam Earthquake
The 1947 Assam earthquake occurred on 29 July at 13:43 UTC with an of 7.3 and a maximum EMS-98 intensity of V (''Strong''). Earthquake The earthquake was located near the border between India and Tibet. Some sources put the epicenter in India, and some put it in Tibet. The released seismic moment was about 1.5×1020 Nm. The mechanism of the earthquake is not well known. In the Chinese literature, this earthquake was often located around the Nang County, Tibet."青藏块体8级左右地震前中强地震活动图像的相似性演化" by 朱红彬 Damage In Dibrugarh, Jorhat, and Tezpur, there were cracks in walls. Failure of electricity was reported in Guwahati. Other seismicity The border region was struck by the much larger 8.6 Assam–Tibet earthquake three years later, on August 15, 1950. See also * List of earthquakes in 1947 * List of earthquakes in India The Indian subcontinent has a history of earthquakes. The reason for the intensity and high frequency of earthqu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1934 Nepal–India Earthquake
The 1934 Nepal–India earthquake or 1934 Bihar–Nepal earthquake was one of the worst earthquakes in India's history. The towns of Munger and Muzaffarpur were completely destroyed. This 8.0 magnitude earthquake occurred on 15 January 1934 at around 2:13 pm IST (08:43 UTC) and caused widespread damage in northern Bihar and in Nepal. Earthquake The epicentre for this event was located in eastern Nepal about south of Mount Everest. The areas where the most damage to life and property occurred extended from Purnea in the east to Champaran in the west (a distance of nearly ), and from Kathmandu in the north to Munger in the south (a distance of nearly ). The impact was reported to be felt in Lhasa to Bombay, and from Assam to Punjab. The earthquake was so severe that in Kolkata, around 650 km (404 mi) from epicenter, many buildings were damaged and the tower of St. Paul's Cathedral collapsed. Ground effects A particular phenomenon of the earthquake was that sand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1905 Kangra Earthquake
The 1905 Kangra earthquake occurred in the Kangra Valley and the Kangra region of the Punjab Province (modern day Himachal Pradesh) in India on 4 April 1905. The earthquake measured 7.8 on the surface wave magnitude scale and killed more than 20,000 people. Apart from this, most buildings in the towns of Kangra, Mcleodganj and Dharamshala were destroyed. Background The calculated epicenter of the earthquake lies within the zone of thrusts along the front of the Himalayas formed by the continuing collision of the Indian plate into the Eurasian plate. Underthrusting of the Indian subcontinent beneath Tibet along a 2,500 km long convergent boundary known as the Main Himalayan Thrust has resulted in the uplifting of the overriding Eurasian Plate thus, creating the long mountain range parallel to the convergent zone. Earthquake characteristics The magnitude 7.8–7.9 earthquake struck the western Himalaya in the state of Himachal Pradesh at an estimated depth of 6 km ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1833 Nepal Earthquake
Events January–March * January 3 – Reassertion of British sovereignty over the Falkland Islands in the South Atlantic. * February 6 – His Royal Highness Prince Otto Friedrich Ludwig of Bavaria assumes the title His Majesty Othon the First, by the Grace of God, King of Greece, Prince of Bavaria. * February 16 – The United States Supreme Court hands down its landmark decision of Barron v. Mayor and City Council of Baltimore. * March 4 – Andrew Jackson is sworn in for his second term as President of the United States. April–June * April 1 – General Antonio López de Santa Anna is elected President of Mexico by the legislatures of 16 of the 18 Mexican states. During his frequent absences from office to fight on the battlefield, Santa Anna turns the duties of government over to his vice president, Valentín Gómez Farías. * April 18 – Over 300 delegates from England, Scotland, Wales and Ireland travel to the office of the Prime Minister, the Earl Grey, to cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Delhi
New Delhi (, , ''Naī Dillī'') is the capital of India and a part of the National Capital Territory of Delhi (NCT). New Delhi is the seat of all three branches of the government of India, hosting the Rashtrapati Bhavan, Parliament House, and the Supreme Court of India. New Delhi is a municipality within the NCT, administered by the NDMC, which covers mostly Lutyens' Delhi and a few adjacent areas. The municipal area is part of a larger administrative district, the New Delhi district. Although colloquially ''Delhi'' and ''New Delhi'' are used interchangeably to refer to the National Capital Territory of Delhi, both are distinct entities, with both the municipality and the New Delhi district forming a relatively small part of the megacity of Delhi. The National Capital Region is a much larger entity comprising the entire NCT along with adjoining districts in neighbouring states, including Ghaziabad, Noida, Gurgaon and Faridabad. The foundation stone of New Delhi was l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
