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Japan Meteorological Agency Seismic Intensity Scale
The Japan Meteorological Agency (JMA) Seismic Intensity Scale (known in Japan as the Shindo seismic scale) is a seismic intensity scale used in Japan to categorize the intensity of local ground shaking caused by earthquakes. The JMA intensity scale differs from magnitude measurements like the moment magnitude () and the earlier Richter scales, which represent how much energy an earthquake releases. Similar to the Mercalli scale, the JMA scale measures the intensities of ground shaking ''at various observation points within the affected area''. Intensities are expressed as numerical values called ; the higher the value, the more intense the shaking. Values are derived from ground acceleration and duration of the shaking, which are themselves influenced by factors such as distance to and depth of the hypocenter (focus), local soil conditions, and nature of the geology in between, as well as the event's magnitude; every quake thus entails numerous intensities. Intensity data ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Summary Of Tables Explaining The JMA Seismic Intensity Scale
Summary may refer to: * Abstract (summary), shortening a passage or a write-up without changing its meaning but by using different words and sentences * Epitome, a summary or miniature form * Abridgement, the act of reducing a written work into a shorter form * Summary or executive summary of a document, a short document or section that summarizes a longer document such as a report or proposal or a group of related reports * Introduction (writing) * Summary (law), which has several meanings in law * Automatic summarization, the use of a computer program to produce an abstract or abridgement See also * Overview (other) * Recap (other) * Synopsis (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sekiya Seikei
, alternatively Sekiya Kiyokage, was a Japanese geologist, one of the first seismologists, influential in establishing the study of seismology in Japan and known for his model showing the motion of an earth-particle during an earthquake. Career Sekiya took up the study of the earthquakes in 1880. In 1886, he was appointed as the first professor of seismology at what was to be the University of Tokyo, the first such full-time university appointment in the world. In this position, he helped in the extension of the seismic survey in Japan and in the erection of seismographs throughout the country. In 1886, the number of observing stations was over 600. In 1896, at the time of his death it had risen to 968. Outside the scientific community, Sekiya is best known for the model representing the motion of the ground during an earthquake, inspired by the Tokyo earthquake of 1887. His earthquake model consists of three twisted copper wires that are mounted side by side on a lacquered woo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kobe
Kobe ( ; , ), officially , is the capital city of Hyōgo Prefecture, Japan. With a population of around 1.5 million, Kobe is Japan's List of Japanese cities by population, seventh-largest city and the third-largest port city after Port of Tokyo, Tokyo and Port of Yokohama, Yokohama. It is located in the Kansai region, which makes up the southern side of the main island of Honshu, Honshū, on the north shore of Osaka Bay. It is part of the Keihanshin metropolitan area along with Osaka and Kyoto. The Kobe city centre is located about west of Osaka and southwest of Kyoto. The earliest written records regarding the region come from the , which describes the founding of the Ikuta Shrine by Empress Jingū in AD 201.Ikuta Shrine official website – "History of Ikuta Shrine" (Japanese) [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Seismological Centre
The International Seismological Centre (ISC) is a non-governmental, nonprofit organisation charged with the final collection, definitive analysis and publication of global seismicity. The ISC was formed in 1964 as an international organisation independent of national governments that would carry on the work of the International Seismological Summary in collecting and analyzing seismic data from around the world, and particularly to handle increased flow of data from the World-Wide Standard Seismograph Network (WWSSN), also established that year. The ISC considers its prime task to be the collection and re-analysis of all available earthquake seismic date in order to produce definitive data on earthquakes. The ISC's catalog is considered "the most complete and authoritative final depository of global earthquake parameter data." Purpose The main scientific goal of the centre is the definitive compilation of earthquake information and the readings on which they are based. Collect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Magnitude Scales
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] |
1995 Great Hanshin Earthquake
The Great Hanshin Earthquake (, ) occurred on January 17, 1995, at 05:46:53 JST in the southern part of Hyōgo Prefecture, Japan, including the region of Hanshin. It measured 6.9 on the moment magnitude scale and had a maximum intensity of 7 on the JMA Seismic Intensity Scale (XI–XII on the Modified Mercalli intensity scale). The tremors lasted for approximately 20 seconds. The focus of the earthquake was located 17 km beneath its epicenter, on the northern end of Awaji Island, 20 km away from the center of the city of Kobe. At least 5,000 people died, about 4,600 of them from Kobe. Kobe, with its population of 1.5 million, was the closest major city to the epicenter and hit by the strongest tremors. It was Japan's second deadliest earthquake in the 20th century after the 1923 Great Kantō earthquake, in which more than 105,000 people died. Earthquake Most of the largest earthquakes in Japan are caused by subduction of the Philippine Sea plate or Pacific p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Research Institute For Earth Science And Disaster Resilience
The National Research Institute for Earth Science and Disaster Resilience (), also known as NIED, is a National Research and Development Agency that conducts research on science and technology related to disaster risk reduction. It owns experimental and observational facilities throughout Japan. The headquarters is located in Tsukuba City, Ibaraki Prefecture. History The history can be broken into phases: 1960s - 1970s * April 1963: National Research Center for Disaster Prevention (NRCDP) established in Tokyo * December 1964: Institute of Snow and Ice Studies established in Nagaoka * October 1969: Shinjo Branch established * June 1970: Large-Scale Earthquake Simulator constructed in Tsukuba * March 1974: Large-Scale Rainfall Simulator constructed in Tsukuba * April 1978: Headquarters moved from Tokyo to Tsukuba 1990s - 2000s * June 1990: NRCDP reorganized as NIED * June 1996: K-NET (Kyoshin Net) starts operation * March 1997: Cryospheric Environment Simulator constructed i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Macroseismic Scale
The European Macroseismic Scale (EMS) is the basis for evaluation of seismic intensity in European countries and is also used in a number of countries outside Europe. Issued in 1998 as an update of the test version from 1992, the scale is referred to as EMS-98. Overview The history of the EMS began in 1988 when the European Seismological Commission (ESC) decided to review and update the Medvedev–Sponheuer–Karnik scale (MSK-64), which was used in its basic form in Europe for almost a quarter of a century. After more than five years of intensive research and development and a four-year testing period, the new scale was officially released. In 1996, the XXV General Assembly of the ESC in Reykjavík passed a resolution recommending the adoption of the new scale by the member countries of the European Seismological Commission. The European macroseismic scale EMS-98 is the first seismic intensity scale designed to encourage co-operation between engineers and seismologists, rather t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Modified Mercalli Intensity Scale
The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or strength of an earthquake — an event occurring at greater or lesser depth. (The "" scale is widely used.) The MMI scale measures intensity of shaking, at any particular location, on the surface. It was developed from Giuseppe Mercalli's Mercalli intensity scale of 1902. While shaking experienced at the surface is caused by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is radiated as seismic waves. They also differ in the depth at which they occur; deeper earthquakes have less interaction with the surface, their energy is spread throughout a larger volume, and the energy reaching the surface is spread across a larger area. Shaking intensity is localised. It generally diminishes with dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Hanshin Earthquake
The Great Hanshin Earthquake (, ) occurred on January 17, 1995, at 05:46:53 JST in the southern part of Hyōgo Prefecture, Japan, including the region of Hanshin. It measured 6.9 on the moment magnitude scale and had a maximum intensity of 7 on the JMA Seismic Intensity Scale (XI–XII on the Modified Mercalli intensity scale). The tremors lasted for approximately 20 seconds. The focus of the earthquake was located 17 km beneath its epicenter, on the northern end of Awaji Island, 20 km away from the center of the city of Kobe. At least 5,000 people died, about 4,600 of them from Kobe. Kobe, with its population of 1.5 million, was the closest major city to the epicenter and hit by the strongest tremors. It was Japan's second deadliest earthquake in the 20th century after the 1923 Great Kantō earthquake, in which more than 105,000 people died. Earthquake Most of the largest earthquakes in Japan are caused by subduction of the Philippine Sea plate or Pac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
