|
2013 North Korean Nuclear Test
On 12 February 2013, North Korean state media announced it had conducted an underground nuclear test, its third in seven years. A tremor that exhibited a nuclear bomb signature with an initial magnitude 4.9 (later revised to 5.1) was detected by the China Earthquake Networks Center, Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization and the United States Geological Survey. In response, Japan summoned an emergency United Nations meeting for 12 February and South Korea raised its military alert status. It is not known whether the explosion was nuclear, or a conventional explosion designed to mimic a nuclear blast; as of two days after the blast, Chinese, Japanese, and South Korean investigators had failed to detect any radiation. Test On 12 February 2013, a spokesman for North Korea's army command said it had successfully conducted a third underground nuclear weapons test, according to the Yonhap. North Korea also said the test had used a mini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Korea
North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korea, Korean Peninsula and borders China and Russia to the north at the Yalu River, Yalu (Amnok) and Tumen River, Tumen rivers, and South Korea to the south at the Korean Demilitarized Zone, Korean Demilitarized Zone (DMZ). The country's western border is formed by the Yellow Sea, while its eastern border is defined by the Sea of Japan. North Korea, like South Korea, claims to be the sole legitimate government of the entire peninsula and List of islands of North Korea, adjacent islands. Pyongyang is the capital and largest city. The Korean Peninsula was first inhabited as early as the Lower Paleolithic period. Its Gojoseon, first kingdom was noted in Chinese records in the early 7th century BCE. Following the unification of the Three Kingdoms of Korea into Unified Silla, Silla and Balhae in the late 7th century, Korea was ruled by the G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Activity
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 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 directly above it is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yanbian Korean Autonomous Prefecture
The Yanbian Korean Autonomous Prefecture is an autonomous prefecture in the east of Jilin, Jilin Province, China. Yanbian is bordered to the north by Heilongjiang, Heilongjiang Province, to the west by Jilin's Baishan, Baishan City and Jilin City, to the south by North Korea's North Hamgyong Province, and to the east by Russia's Primorsky Krai. Yanbian is designated as a Korean autonomous prefecture due to the large number of Koreans (Chaoxianzu) living in the region. The prefectural capital is Yanji and the total area is . The prefecture has an important Balhae archaeological sitethe Ancient Tombs at Longtou Mountainwhich includes the Mausoleum of Princess Jeonghyo. History In the Ming dynasty, Yanbian was governed by the Jianzhou Guard () and in the late Qing dynasty the area was divided into the Yanji () and Hunchun () subprefectures. From 1644 to 1800s, the Manchurian Qing state maintained a policy of disallowing Han Chinese immigration into traditionally Manchurian lands i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antu County
Antu County (; Chosŏn'gŭl: 안도현; Hangul: 안투현) is a county of southeastern Jilin province, Northeast China. It is under the administration of the Yanbian Korean Autonomous Prefecture. Antu is home to Koreans in China, Korean and Manchu people, Manchu minorities. In 2020 it had a population of 195,000, of which 17.9% Koreans. It has a border crossing with North Korea at Shuangmufeng (双目峰). Administrative divisions Antu has seven Town (China), towns and two Townships of the People's Republic of China, townships. Towns: *Mingyue (明月镇 / 명월진) *Songjiang, Antu County, Songjiang (松江镇 / 송강진) *Erdaobaihe (二道白河镇 / 이도백하진) *Liangjiang, Antu County, liangjiang (两江镇 / 량강진) *Shimen, Antu County, Shimen (石门镇 / 석문진) *Wanbao, Antu County, Wanbao (万宝镇 / 만보진) *Liangbing (亮兵镇 / 량병진) Townships: *Xinhe Township, Antu County, Xinhe Township (新合乡 / 신합향) *Yongqing Township (永庆乡 / ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hunchun
Hunchun is a county-level city in the Yanbian Korean Autonomous Prefecture within Jilin province to the far east. It borders North Hamgyong Province in North Korea and Primorsky Krai in Russia, has over 250,000 inhabitants, and covers 5,145 square kilometers. The site of the eastern capital of the Balhae Kingdom between 785 and 793, Donggyeong, was located here. The city's name Hunchun comes from ''Huncun'' in Manchu language (). The city and the village Fangchuan is located near the point of junction of the borders of China, Russia, and North Korea; provided with an observation platform, it is a popular tourist attraction. Administrative divisions Hunchun has four subdistricts, four towns, and five townships. Subdistricts: * Xin'an Subdistrict ( / ) * Jinghe Subdistrict ( / ) * Henan Subdistrict ( / ) * Jinhai Subdistrict ( / ) Towns: * Chunhua ( / ) *Jingxin ( / ) * Banshi ( / ) * Ying'an ( / ) Townships: * Hadamen Township ( / ) * Machuanzi Township ( / ) * Miho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
:Surface Wave Magnitude
The surface wave magnitude (M_s) scale is one of the magnitude scales used in seismology to describe the size of an earthquake. It is based on measurements of Rayleigh surface waves that travel along the uppermost layers of the Earth. This magnitude scale is related to the local magnitude scale proposed by Charles Francis Richter in 1935, with modifications from both Richter and Beno Gutenberg throughout the 1940s and 1950s. It is currently used in People's Republic of China as a national standard (GB 17740-1999) for categorising earthquakes. Recorded magnitudes of earthquakes through the mid 20th century, commonly attributed to Richter, could be either M_s or M_L. Definition The formula to calculate surface wave magnitude is: :M_s = \log_\left(\frac\right)_ + \sigma(\Delta)\,, where A is the maximum particle displacement in surface waves (vector sum of the two horizontal displacements) in μm, T is the corresponding period in s (usually 20 2 seconds), Δ is the epice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abbreviation
An abbreviation () is a shortened form of a word or phrase, by any method including shortening (linguistics), shortening, contraction (grammar), contraction, initialism (which includes acronym), or crasis. An abbreviation may be a shortened form of a word, usually ended with a trailing period. For example, the term ''etc.'' is the usual abbreviation for the list of Latin phrases, Latin phrase . Types A ''Contraction (grammar), contraction'' is an abbreviation formed by replacing letters with an apostrophe. Examples include ''I'm'' for ''I am'' and ''li'l'' for ''little''. An ''initialism'' or ''acronym'' is an abbreviation consisting of the initial letter of a sequence of words without other punctuation. For example, Federal Bureau of Investigation, FBI (wiktionary:FBI#Pronunciation, ), United States, USA (wiktionary:USA#Pronunciation, ), IBM (wiktionary:IBM#Pronunciation, ), BBC (wiktionary:BBC#Pronunciation, ). When initialism is used as the preferred term, acronym refers mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russian Far East
The Russian Far East ( rus, Дальний Восток России, p=ˈdalʲnʲɪj vɐˈstok rɐˈsʲiɪ) is a region in North Asia. It is the easternmost part of Russia and the Asia, Asian continent, and is coextensive with the Far Eastern Federal District, which encompasses the area between Lake Baikal and the Pacific Ocean. The area's largest city is Khabarovsk, followed by Vladivostok. The region shares land borders with the countries of Mongolia, China, and North Korea to its south, as well as maritime boundary, maritime boundaries with Japan to its southeast, and with the United States along the Bering Strait to its northeast. Although the Russian Far East is often considered as a part of Siberia abroad, it has been historically categorized separately from Siberia in Russian regional schemes (and previously during the history of the Soviet Union, Soviet era when it was called the Soviet Far East). Terminology In Russia, the region is usually referred to as simply th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russian Academy Of Sciences
The Russian Academy of Sciences (RAS; ''Rossíyskaya akadémiya naúk'') consists of the national academy of Russia; a network of scientific research institutes from across the Russian Federation; and additional scientific and social units such as libraries, publishing units, and hospitals. Peter the Great established the academy (then the St. Petersburg Academy of Sciences) in 1724 with guidance from Gottfried Wilhelm Leibniz, Gottfried Leibniz. From its establishment, the academy benefitted from a slate of foreign scholars as professors; the academy then gained its first clear set of goals from the 1747 Charter. The academy functioned as a university and research center throughout the mid-18th century until the university was dissolved, leaving research as the main pillar of the institution. The rest of the 18th century continuing on through the 19th century consisted of many published academic works from Academy scholars and a few Academy name changes, ending as The Imperial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geophysical Service Of The Russian Academy Of Sciences
Geophysical Service of the Russian Academy of Sciences () is a research body responsible for geological research. History Geophysical Service was established on the basis of Experimental Methodical Expedition of the Joint Institute of Physics of the Earth in accordance with the Decree of the Presidium of the Russian Academy of Sciences No.107 on May 31, 1994, pursuant to Order of the Government of Russia No.444 of May 11, 1993. Functions The main activities of service: basic research and applied research in the field of seismology and geophysics, as well as conducting continuous seismic monitoring of the Russian Federation, tsunami warning in the Russian Far East, monitoring volcanic activity in Kamchatka and slow monitoring of geodynamic processes in the crust and ground deformation, carrying out continuous seismic monitoring of the world. In addition, in comply with the Order of the Government of Russia, Russian Academy of Sciences, the service: *Together with Federal Service ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kilometer
The kilometre ( SI symbol: km; or ), spelt kilometer in American and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for ). It is the preferred measurement unit to express distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is used. Pronunciation There are two common pronunciations for the word. # # The first pronunciation follows a pattern in English whereby SI units are pronounced with the stress on the first syllable (as in kilogram, kilojoule and kilohertz) and the pronunciation of the actual base unit does not change irrespective of the prefix (as in centimetre, millimetre, nanometre and so on). It is generally preferred by the British Broadcasting Corporation (BBC), the Canadian Broadcasting Corporation (CBC), and the Australian Broadcasting Corporation (ABC). Man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 point of origin below ground; a synonym is the focus of an earthquake. Generally, the terms ''ground zero'' and ''surface zero'' are also used in relation to epidemics, and other disasters to mark the point of the most severe damage or destruction. The term is distinguished from the term zero point in that the latter can also be located in the air, underground, or underwater. Trinity, Hiroshima and Nagasaki The term "ground zero" originally referred to the hypocenter of the Trinity test in Jornada del Muerto desert near Socorro, New Mexico, and the atomic bombings of Hiroshima and Nagasaki in Japan. The United States Strategic Bombing Survey of the atomic attacks, released in June 1946, used the term liberally, defining it as: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
