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Japan Weather Association ( Japanese: 日本気象協会 JWA [1]) is a Japanese general incorporated foundation that conducts meteorological services. [2] [3] It founded in 1950. [4]
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The name, "Yen", derives from the Japanese word 圓 (en, ; "round"), which borrows its phonetic reading from Chinese yuan, similar to North Korean won and South Korean won.Originally, the Chinese had traded silver in mass called sycees, and when Spanish and Mexican silver coins arrived from the Philippines, the Chinese called them "silver rounds" (Chinese: 銀圓; pinyin: yínyuán) for their ...
- Terminology
- Major Examples
- Occurrence
- Measurement and Location
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- In Culture
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An earthquake is the shaking of the surface of Earth resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes may also be referred to as quakes, tremors, or temblors. The word tremor is also used for non-earthquake seismic rumbling. In its most general sense, an earthquake is any seismic event—whether nat...
One of the most devastating earthquakes in recorded history was the 1556 Shaanxi earthquake, which occurred on 23 January 1556 in Shaanxi, China. More than 830,000 people died. Most houses in the area were yaodongs—dwellings carved out of loess hillsides—and many victims were killed when these structures collapsed. The 1976 Tangshan earthquake, whi...
Tectonic earthquakes occur anywhere on the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. The sides of a fault move past each other smoothly and aseismically only if there are no irregularities or asperities along the fault surface that increases the frictional resistance. Most fault ...
The instrumental scales used to describe the size of an earthquake began with the Richter magnitude scale in the 1930s. It is a relatively simple measurement of an event's amplitude, and its use has become minimal in the 21st century. Seismic waves travel through the Earth's interior and can be recorded by seismometers at great distances. The surfa...
Prediction
Earthquake prediction is a branch of the science of seismology concerned with the specification of the time, location, and magnitude of future earthquakes within stated limits. Many methods have been developed for predicting the time and place in which earthquakes will occur. Despite considerable research efforts by seismologists, scientifically reproducible predictions cannot yet be made to a specific day or month.
Forecasting
While forecasting is usually considered to be a type of prediction, earthquake forecasting is often differentiated from earthquake prediction. Earthquake forecasting is concerned with the probabilistic assessment of general earthquake hazards, including the frequency and magnitude of damaging earthquakes in a given area over years or decades.For well-understood faults the probability that a segment may rupture during the next few decades can be estimated. Earthquake warning systemshave been d...
Preparedness
The objective of earthquake engineering is to foresee the impact of earthquakes on buildings, bridges, tunnels, roadways, and other structures, and to design such structures to minimize the risk of damage. Existing structures can be modified by seismic retrofitting to improve their resistance to earthquakes. Earthquake insurance can provide building owners with financial protection against losses resulting from earthquakes. Emergency managementstrategies can be employed by a government or org...
Historical views
From the lifetime of the Greek philosopher Anaxagoras in the 5th century BCE to the 14th century CE, earthquakes were usually attributed to "air (vapors) in the cavities of the Earth." Thales of Miletus (625–547 BCE) was the only documented person who believed that earthquakes were caused by tension between the earth and water. Other theories existed, including the Greek philosopher Anaxamines' (585–526 BCE) beliefs that short incline episodes of dryness and wetness caused seismic activity. T...
Mythology and religion
In Norse mythology, earthquakes were explained as the violent struggle of the god Loki. When Loki, god of mischief and strife, murdered Baldr, god of beauty and light, he was punished by being bound in a cave with a poisonous serpent placed above his head dripping venom. Loki's wife Sigynstood by him with a bowl to catch the poison, but whenever she had to empty the bowl the poison dripped on Loki's face, forcing him to jerk his head away and thrash against his bonds, which caused the earth t...
In popular culture
In modern popular culture, the portrayal of earthquakes is shaped by the memory of great cities laid waste, such as Kobe in 1995 or San Francisco in 1906. Fictional earthquakes tend to strike suddenly and without warning. For this reason, stories about earthquakes generally begin with the disaster and focus on its immediate aftermath, as in Short Walk to Daylight (1972), The Ragged Edge (1968) or Aftershock: Earthquake in New York (1999). A notable example is Heinrich von Kleist's classic nov...
Phenomena similar to earthquakes have been observed in other planets (e.g., marsquakes on Mars) and on the Moon (e.g., moonquakes).
Hyndman, Donald; Hyndman, David (2009). "Chapter 3: Earthquakes and their causes". Natural Hazards and Disasters (2nd ed.). Brooks/Cole: Cengage Learning. ISBN 978-0-495-31667-1.Liu, ChiChing; Linde, Alan T.; Sacks, I. Selwyn (2009). "Slow earthquakes triggered by typhoons". Nature. 459 (7248): 833–836. Bibcode:2009Natur.459..833L. doi:10.1038/nature08042. ISSN 0028-0836....Unit 731 ( Japanese: 731部隊, Hepburn: Nana-san-ichi Butai), [ note 1] short for Manchu Detachment 731 and also known as the Kamo Detachment[ 3]: 198 and the Ishii Unit, [ 5] was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that engaged in lethal human experimentation and ...
The 2024 Summer Olympics, [ b] officially the Games of the XXXIII Olympiad[ c] and branded as Paris 2024, is an international multi-sport event that are occuring from 24 July to 11 August 2024 in France, with the opening ceremony having taken place on 26 July.
Ethnologue (2023) The following languages are listed as having 45 million or more total speakers in the 26th edition of Ethnologue published in 2023. [ 4] This section does not include entries that Ethnologue identifies as macrolanguages encompassing all their respective varieties, such as Arabic, Lahnda, Persian, Malay, Pashto, and Chinese .
