China is located in the world's two largest earthquake focus areas - the Pacific Rim seismic belt and the Eurasian seismic belt, by the Pacific plate, Indian plate and the Philippine Sea plate extrusion, seismic fault zone is developed. Earthquakes occur in China is strong and strong, the vast majority of it is occurring in the mainland shallow earthquake , the depth of most of the hypocenter within 20 km. Therefore, China is the world's most earthquake-prone countries, but also suffer the most serious earthquake in one of the countries, China's mainland land area of about 1/4, but the 20th century, 1/3 of land destructive earthquake occurred in China , The death toll of about 60 million, accounting for the same period around the world due to the death toll of about half the earthquake. Twenty million people died in the 20th century, a total of two major earthquakes, have occurred in China, one in 1920, Haiyuan, Ningxia 8.5 earthquake, killing more than 230,000 people; the other in 1976 Tangshan, Hebei 7.8 earthquake, the death of 24 More than 10,000 people. These two earthquakes have caused people's lives and property suffered a painful loss.
China earthquake activity frequency is high, intensity, shallow source, widely distributed, is a serious earthquake in the country. Since the 20th century, there have been more than six earthquakes in China, nearly 800 times, in addition to Guizhou, Zhejiang provinces and Hong Kong Special Administrative Region of all provinces, autonomous regions and municipalities. Since 1950, more than 100 devastating earthquakes have struck 22 provinces (autonomous regions and municipalities) since 1949, involving the eastern part of the country, which is responsible for more than 50 percent of the world's quake deaths. 14 provinces, resulting in more than 270,000 people were killed, accounting for various types of disasters, 54% of the number of deaths, earthquake disaster area of more than 30 million square kilometers, housing collapsed 700 million. The severity of earthquakes and other natural disasters constitutes one of China's basic national conditions.
China's seismic activity is mainly distributed in the five regions of the 23 seismic belt. The northwest region, mainly in the Gansu Hexi Corridor, Qinghai, Ningxia, Tianshan Mountains, north and south; ④ North China, mainly in the southwestern region, mainly in Tibet, western Sichuan and Yunnan Midwest; Yinshan area, central Shandong and Bohai Bay; ⑤ the southeast coast of Guangdong, Fujian and other places in the region, mainly in the Taihang Mountains on both sides, Fen Weihe Valley, Yinshan - Yanshan area, China's Taiwan Province is located in the Pacific Rim earthquake belt, Tibet, Xinjiang, Yunnan, Sichuan, Qinghai and other provinces located in the Himalayan - Mediterranean seismic belt, other provinces in the relevant seismic zone.
The distribution of seismic zones in China is an important basis for the development of China's key earthquake monitoring areas. China earthquake is mainly distributed in five regions: Taiwan, southwest, northwest, north, southeast coastal areas and 23 seismic belt.
"North China Earthquake". Including Hebei, Henan, Shandong, Inner Mongolia, Shanxi, Shaanxi, Ningxia, Jiangsu, Anhui and other provinces in all or part of the region. In the five earthquakes, its earthquake intensity and frequency after the "Qinghai-Tibet Plateau earthquake", ranking second in the country. As the metropolitan area is located in the region, so particularly interesting. According to statistics, the region has documented the magnitude 8 earthquake occurred five times; 7-7.9 earthquake occurred 18 times. In addition, it is located in China's densely populated, large city concentration, political and economic, cultural, transportation are well-developed areas, the threat of earthquake disaster is extremely serious.
North China earthquake area is divided into four seismic zones.
(1) Tancheng-Yingkou seismic belt. Including from Suqian to Tieling Liaoning, Hebei, Shandong, Jiangsu and other provinces in most or part of the region. Is a strong seismic activity zone in the continental area of eastern China. 1668 earthquake in Shandong Tancheng 8.5, the Bohai Sea in 1969 7.4 earthquake in 1974 Haicheng 7.4 earthquak e occurred in the earthquake zone, according to records, the band occurred a total of more than 60 earthquake 4.7 times. Of which 7-7.9 earthquake 6 times; 8 or more earthquakes 1 times.
(2) North China Plain seismic belt. The southern boundary is located in Xinxiang - Bengbu line, the northern boundary is located in the south of Yanshan, the west boundary is located in the east of Taihang Mountains, the eastern boundary lies in the western edge of Xiaoliaohe - Liaodongwan depression, southward to southeast of Tianjin. Is the Beijing, Tianjin, Tang region the greatest threat to the seismic zone. 1679 Hebei Sanhe 8.0 earthquake in 1976 Tangshan earthquake occurred in this band 7.8. According to statistics, a total of more than 4.7 earthquake occurred more than 140 times. Of which 7-7.9 earthquake 5 times; 8 or more earthquakes 1 times.
(3) Fenwei seismic belt. North of Hebei Xuanhua-Huai'an Basin, Huailai-Yanqing Basin, south of Yangyuan Basin, Yuxian Basin, Datong Basin, Xinding Basin, Lingqiu Basin, Taiyuan Basin, Linfen Basin, Yuncheng Basin to Weihe Basin. Is a strong seismic activity zone in eastern China. 1303 Shanxi Hongdong 8.0 earthquake in 1556 Shaanxi Huaxian 8.0 earthquake occurred in this band. January 1998 Zhangbei earthquake is also 6.2 in the vicinity of the band. Since the record, the earthquakes occurred in 4.7 or more earthquakes about 160 times. 7-7.9 earthquake 7 times; 8 or more earthquakes 2 times.
(4) Yinchuan-Hetao seismic belt. Located in the western and northern parts of the Loop, Yinchuan, Wuda, Dengkou to Hohhot in the west. 1739 Ningxia Yinchuan 8.0 earthquake occurred in this belt. The earthquake zone, the historical earthquake records began in the year 849, due to the lack of historical records more, according to information available, the band recorded a total of 4.7 or more earthquake about 40 times. Of which 6-6.9 earthquake 9; 8 earthquake 1 times.
"Qinghai - Tibet Plateau Seismic Zone". Including the Hindu Kush, the West Kunlun Mountains, the Altun Mountains, Qilian Mountains, Helan Mountain - Liupanshan, Longmen Shan, the Himalayas and the eastern mountains of the Hengduan Mountains surrounded by the mountains of the vast plateau region. Covering all or part of Qinghai, Tibet, Xinjiang, Gansu, Ningxia, Sichuan and Yunnan.
Earthquakes are likely to encounter, if the earthquake zone will usually occur on earthquakes, large earthquakes usually appear in the mountains, but more in the plains of the earthquake, to Changsha, Beijing, if there is an earthquake, then there may be 5-7 , To that close to the Tangshan Tangshan earthquake occurred in Beijing is 7.8, Beijing has been affected.
Part of the earthquake is due to the deep underground rock strata, caused by rupture, this kind of earthquake called tectonic earthquake. The occurrence of the largest number of destructive power is also the largest, accounting for more than 90% of earthquakes around the world.
In contrast, the most common place is in the mountains, and the second is the sea area because the area of the sea area than the land, so the largest area of the earthquake, but the seabed is also the undersea mountains, if the mountains are counted, should be the most mountains, but Earthquakes are not necessarily very large in magnitude. Theoretically, in areas where small earthquakes occur frequently, there is not necessarily large earthquakes due to the frequent release of energy from crustal movement. Many are small or no sense earthquakes, but Do not rule out the discovery of another direction of energy accumulation, coupled with the scarcity of human habitation, so the earthquake in these areas will not cause a great impact, the earthquake area is relatively small, usually not reported, In the seismic active seismic belt, is the most prone to earthquakes, whether it is mountains, plains, some areas can occur for a long time an earthquake, but due to underground deep underground rock energy accumulation, so an earthquake, will Is a major earthquake, the earthquake is often in the plains on the earthquake zone, where it is also relatively concentrated areas of people's cities, so the impact is relatively large, giving people a deeper impression of the reasons, as the Tangshan earthquake, People referred to the earthquake, always bring Tangshan earthquake.
General earthquake magnitude should be between 5-7, to Changsha, Beijing, if an earthquake, and that Tangshan earthquake, Beijing has also been affected, Tangshan in Beijing very close.
Earthquakes are mainly distributed in the Pacific Rim, Albis-Himalayan, Mid-Atlantic Ridge and Indian Ridge. In general, earthquakes occur mainly in the ridge and tectonic zones such as rifts, trenches, transition faults, and ancient plate margins in the interior of the continent.
China is located in the world between the two major seismic zones - the Pacific Rim seismic belt and the Eurasian seismic belt, by the Pacific plate, Indian plate and the Philippine Sea plate extrusion, seismic fault zone is developed. Since the 20th century, there have been more than six earthquakes in China, nearly 800 times, in addition to Guizhou, Zhejiang provinces and Hong Kong Special Administrative Region of all provinces, autonomous regions and municipalities.
China earthquake activity frequency is high, intensity, shallow source, widely distributed, is a serious earthquake in the country. Since 1950, more than 100 devastating earthquakes have struck 22 provinces (autonomous regions and municipalities) since 1949, and the number of people in the eastern region 14 provinces, resulting in more than 270,000 people were killed, accounting for all types of disasters, 54% of the number of deaths, earthquake disaster area of more than 30 million square kilometers, housing collapsed 700 million. The severity of earthquakes and other natural disaster constitutes one of China's basic national conditions.
China's seismic activity is mainly distributed in the five regions of the 23 seismic belt. The northwest region, mainly in the Gansu Hexi Corridor, Qinghai, Ningxia, Tianshan Mountains, north and south; ④ North China, mainly in the southwestern region, mainly in Tibet, western Sichuan and Yunnan Midwest; Yinshan area, central Shandong and Bohai Bay; ⑤ the southeast coast of Guangdong, Fujian and other places in the region, mainly in the Taihang Mountains on both sides, Fen Weihe Valley, Yinshan - Yanshan area, China's Taiwan Province is located in the Pacific Rim earthquake belt, Tibet, Xinjiang, Yunnan, Sichuan, Qinghai and other provinces located in the Himalayan - Mediterranean seismic belt, other provinces in the relevant seismic zone. The distribution of seismic zones in China is an important basis for the development of China's key earthquake monitoring areas.
China's seismic activity is mainly distributed in the five regions of the 23 seismic belt. The northwest region, mainly in the Gansu Hexi Corridor, Qinghai, Ningxia, Tianshan Mountains, north and south; ④ North China, mainly in the southwestern region, mainly in Tibet, western Sichuan and Yunnan Midwest; Yinshan area, central Shandong and Bohai Bay; ⑤ the southeast coast of Guangdong, Fujian and other places in the region, mainly in the Taihang Mountains on both sides, Fen Weihe Valley, Yinshan - Yanshan area;
It should be said that most of our cities are not in the earthquake zone, our ancestors city location is good. In the earthquake belt of the city are: Beijing, Tianjin, Shijiazhuang, Shenyang, Hefei, Taiyuan, Fuzhou, Taiwan, Kunming, Chengdu, Lanzhou, Yinchuan, Urumqi.
Not in the earthquake zone on the possibility of an earthquake that is almost zero, but will be a strong earthquake felt it.
China's Guizhou, Zhejiang provinces have never been an earthquake.
Source: Atlas of China's Natural Disaster System
Comment list ( 1 )
非常喜欢，很有用非常需要
