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1984 Cachar Earthquake
The 1984 Cachar earthquake rattled much of Southern Assam on December 31, 1984, at 5:03 a.m. (UTC+05:30, UTC+5:30) with an epicenter 20 kilometers southwest of Lakhipur. The quake measured with a magnitude of 6.0 on the moment magnitude scale and an estimated intensity of VIII (''Severe'') on the Modified Mercalli intensity scale. About 20 people died and 100 others sustained mild to severe injuries. Geological setting Cachar district, Cachar lies on the Shillong Plateau, in the northeast region of India. It is one of the most seismically active regions in the world, due to its being located between the boundary of the Indian Plate and the Eurasian Plate, thus creating the Himalayan arc. The continental Indian Plate collides with the Burma Plate (part of the Eurasian Plate) at an oblique angle. The continental collision zone is seismically active with the potential to generate large earthquakes. The events following this earthquake (1984) are said to be the beginning of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Time In India
India uses only one time zone (even though it spans two geographical time zones) across the whole nation and all its territories, called Indian Standard Time (IST), which equates to UTC+05:30, i.e. five and a half hours ahead of Coordinated Universal Time (UTC). India does not currently observe daylight saving time (DST or summer time). The official time signal is given by the Time and Frequency Standards Laboratory. The IANA time zone database contains only one zone pertaining to India, namely ''Asia/Kolkata''. The date and time notation in India shows some peculiarities. Background History Ancient India The 4th century CE astronomical treatise Surya Siddhanta postulated a spherical Earth. The book described a custom of the prime meridian, or zero longitude, as passing through '' Avanti'', the ancient name for the historic city of Ujjain, and ''Rohitaka'', the ancient name for Rohtak (), a city near the Kurukshetra. The day used by ancient Indian astronomers be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Body-wave Magnitude
Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at a given location. Magnitudes are usually determined from measurements of an earthquake's seismic waves as recorded on a seismogram. Magnitude scales vary based on what aspect of the seismic waves are measured and how they are measured. Different magnitude scales are necessary because of differences in earthquakes, the information available, and the purposes for which the magnitudes are used. Earthquake magnitude and ground-shaking intensity The Earth's crust is stressed by tectonic forces. When this stress becomes great enough to rupture the crust, or to overcome the friction that prevents one block of crust from slipping past another, energy is released, some of it in the form of various kinds of seismic waves that cause ground-shaki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1984 Disasters In India
Events January * January 1 – The Bornean Sultanate of Brunei gains full independence from the United Kingdom, having become a British protectorate in 1888. * January 7 – Brunei becomes the sixth member of the Association of Southeast Asian Nations (ASEAN). * January 9 – Van Halen releases their sixth studio album ''1984'' (''MCMLXXXIV''), which debuts at number 2 on the Billboard 200 albums chart, and will go to sell over 10 million copies in the United States. * January 10 ** The United States and the Vatican (Holy See) restore full diplomatic relations. ** The Victoria Agreement is signed, institutionalising the Indian Ocean Commission. *January 24 – Steve Jobs launches the Macintosh personal computer in the United States. *January 27 – American singer Michael Jackson's hair caught on fire during the making of the Pepsi commercial. February * February 3 ** John Buster and the research team at Harbor–UCLA Medical Center announce history's first embryo transfe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquakes In India
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 Seismic intensity scales, intensity, from those so weak 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. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. In its most general sense, the word ''earthquake'' is used to describe any seismic event that generates seismic waves. Earthquakes can occur naturally or be induced by human activities, such as mining, fracking, and nuclear weapons testing. The initial point of rupture is called the hypocenter or focus, while the ground level direc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lists Of 20th-century Earthquakes
This list of 20th-century earthquakes is a list of earthquakes of Seismic scale, magnitude 6 and above that occurred in the 20th century. Sone smaller events which nevertheless had a significant impact are also included. After 1900 most earthquakes have some degree of seismometer, instrumental records and this means that the locations and magnitudes are more reliable than for earlier events. List of deadliest earthquakes List of largest earthquakes by magnitude * Note: At least 8.5+ magnitude List of deadliest earthquakes by year 1901–1910 1911–1920 1921–1930 1931–1940 1941–1950 1951–1960 1961–1970 1971–1980 1981–1990 1991–2000 :Key to magnitudes :ML = Richter magnitude scale, Local magnitude (Richter) :MS = Surface-wave magnitude :Mw = moment magnitude scale, Moment magnitude See also *Lists of earthquakes References {{DEFAULTSORT:20th-century earthquakes Lists of 20th-century earthquakes, 20th-century earthquakes, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In India
The Indian subcontinent has a history of earthquakes. The reason for the intensity and high frequency of earthquakes is the Indian plate driving into Asia at a rate of approximately 47 mm/year. The following is a list of major earthquakes which have occurred in India, including those with epicentres outside India that caused significant damage or casualties in the country. Earthquakes The list pertains to the Indian Republic since 1947, and the Indian subcontinent before that. See also * Earthquake zones of India * Geology of India References ''Sources * Further reading * External links Earthquake Reports, India Meteorological Department (on line) {{Authority control Earthquake India Earthquakes 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 c ... Tsunamis ... [...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 8.7. The epicentre was located in the Mishmi Hills. It is one of the strongest earthquakes 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. Tectonic setting Northeastern India and southern Tibet lie in the frontal part of the zone of collision between the northward moving Indian plate and Eurasia. The thrust belt that marks this plate boundary zone is formed of a series of sub-parallel thrust faults. The thrust faults in this part of the Himalayas show a rapid lateral change in orientation fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silchar
Silchar is a city and the headquarters of the Cachar district of the state of Assam, India. It is second largest city of Assam after Guwahati in terms of population and GDP. It is also administrative capital of Barak Valley division. It is located south east of Guwahati. It was founded by Captain Thomas Fisher in 1832 when he shifted the headquarters of Cachar to Janiganj in Silchar. It earned the moniker "Island of Peace" from Indira Gandhi, the then Prime Minister of India. Silchar is the site of the world's first polo club and the first competitive polo match. In 1985, an Air India flight from Kolkata to Silchar became the world's first all-women crew flight. Silchar was a tea town and Cachar Club, Cachar club was the meeting point for tea planters. Etymology The name Silchar comes from the two Bengali language, Bengali words 'shil' and 'char', meaning 'rock' and 'shore/island' respectively. The city was founded in Janiganj-Sadarghat area of the town near the Barak Valley, B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meizoseismal Area
The meizoseismal area in an earthquake is the area of maximum damage. For example, in the Charleston, South Carolina, earthquake of 1886, the meizoseismal area was an area about twenty by thirty miles stretching northeast between Charleston and Jedburg and incorporating Summerville. The estimated epicenter was near Middleton Place. References Seismology {{seismology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sedimentary Rock
Sedimentary rocks are types of rock (geology), rock formed by the cementation (geology), cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or deposited at Earth's surface. Sedimentation is any process that causes these particles to settle in place. Geological detritus originates from weathering and erosion of existing rocks, or from the solidification of molten lava blobs erupted by volcanoes. The geological detritus is transported to the place of deposition by water, wind, ice or Mass wasting, mass movement, which are called agents of denudation. Biological detritus is formed by bodies and parts (mainly shells) of dead aquatic organisms, as well as their fecal mass, suspended in water and slowly piling up on the floor of water bodies (marine snow). Sedimentation may also occur when dissolved minerals precipitate from aqueous solution, water solution. The sedimentary rock cover of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isoseismal Map
In seismology, an isoseismal map is used to show Contour line, countour lines of equally felt seismic intensity, generally measured on the Modified Mercalli scale. Such maps help to identify earthquake epicenters, particularly where no seismometer, instrumental records exist, such as for historical earthquakes. They also contain important information on ground conditions at particular locations, the underlying geology, radiation pattern of the seismic waves, and the response of different types of buildings. They form an important part of the macroseismic approach, i.e. that part of seismology dealing with noninstrumental data. The shape and size of the isoseismal regions can be used to help determine the Seismic scale#Magnitude scales, magnitude, Focus (earthquake), focal depth, and focal mechanism of an earthquake. History The first known isoseismal map was produced for the 1810 earthquake in Mór in Hungary, and published by Kitaibel and Tomtsányi in 1814. The first, six-level i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
