Does Fangcheng County, Henan Province belong to the earthquake zone?

The biggest earthquake in Nanyang history

An earthquake of magnitude 6.5 occurred in Nanyang on October 23rd, A.D. 16/KLOC-0, the largest earthquake in Nanyang's history. The epicenter was located at 33 00' north latitude and 1 12 east longitude. 30 feet, 8 degrees strength. The earthquake occurred on the fifth day of September in the twenty-second year of Jianwu in the Eastern Han Dynasty (AD 46). According to historical records, there were "forty-two earthquakes in September, especially in Nanyang", "The earthquake in September was severe, and the ground fissured and crushed people", and "The earthquake cracked and crushed many people, and Tangxian was also shocked". "Nanyang earthquake cracked in September, and many people died. A letter was sent to the disaster relief T-shirt. Don't lose this year's rent. " "Nanyang earthquake cracked in September, killing many people. Be ordered not to lose the land rent. " The Nanyang earthquake in 22 years was very serious. "September Nanyang earthquake ground fissure, many people were crushed to death, Tangxian (tanghe county) also felt the earthquake" "September Fuling (Zaoyang, Hubei) ground fissure". After the earthquake, the ruling class issued an imperial edict: "The earthquake in Japan, especially the Nanyang earthquake, is the most important. Those who are still are now shattered, and the blame is on the monarch. Ghosts and gods are immoral, which harms officials. I am very afraid of Yan, so that Nanyang's draft land rent this year will not lose money, and people will be sent to pay homage from time to time. Before Chen Wu, the death penalty was imprisonment, and the death penalty was mitigated. The disciples used pliers to help the dead and gave the people in the county a coffin of 3 thousand yuan. Their mouths were taxed and their houses were especially destroyed. Don't take responsibility. If the official dies, or the house is destroyed under a bad wall, and the family is weak and can't clean up, ask Qian Gu for help. " According to later calculations, the earthquake caused about 1 10,000 casualties.

Qing Shunzhi seventeen-year earthquake

1660 On June 9, an earthquake of magnitude 4.7 occurred in Nanyang. The epicenter was located at 33 00 ′ north latitude and112 30 ′ east longitude. The Records of Nanyang County in the 30th year of Kangxi (169 1) recorded: "The Nanyang earthquake occurred on the second day of May in the 17th year of Shunzhi in Qing Dynasty. From noon to Shanghai, it rained heavily, the water was several feet, the house was private and the walls were inclined. " The number of casualties is unknown, and the economic loss is estimated to be 65.438+0.5 billion yuan.

1973 Song Wan earthquake

1973165438+1From October 29th to February 4th, an earthquake swarm of magnitude 5. 1 occurred in Danjiang Reservoir, Song Wan, Xichuan County, and 22 earthquakes of magnitude 2.0 or above occurred in six days. Main shock 5. 1. The epicentre is located at the intersection of Xichuan fault zone and Jingziguan-Song Wan fault zone, which has the dual characteristics of tectonic earthquake and reservoir earthquake superposition. Although the magnitude is not high, the area is not large, but the source is shallow and harmful. In the earthquake area of 20 square kilometers, 305 houses collapsed, 744 houses were damaged, and 855 houses were cracked and tilted, accompanied by slight cracks in the ground. The economic loss is more than 3 million yuan.

1976 Mashankou earthquake in Neixiang

1976 From February 5th to March 5th, an earthquake swarm of magnitude 4.0 occurred in Mashankou, neixiang county. Earthquakes within 30 days shall be no less than 2.0 ***6 1 time. The epicenter was located at 3315' north latitude and110 57' east longitude. The main earthquake is

Neixiang 4.29 earthquake

On April 29th, 2000 1 1: 54: 46, an earthquake of magnitude 4.7 occurred in Mashankou, neixiang county. The epicentre of the earthquake is located in Mashankou, Sishan and Gao Qiu in Neixiang, covering an area of about 60 square kilometers. The epicenter intensity is 6 degrees, the magnitude is 4.7, and the focal depth is 16 km. The earthquake * * * divided five fault zones, namely, six-degree strong zone, six-degree strong zone, five-degree strong zone, four-degree strong zone and three-degree strong zone. Among them, six-degree strong zone and six-degree strong zone are also extreme earthquake zones and severely damaged zones, which are located in Mashankou, Sishan and Gao Qiu respectively, covering an area of about 60 square kilometers. The area was seriously damaged, with death 1 person, 7 people were seriously injured, 2 1 person was slightly injured, 87,000 houses were damaged, about 8788 10 square meter, the economic loss was 57.6 million yuan, and the affected population190,000 people, which is rare in Nanyang in recent years. The sixth degree zone is a light earthquake zone with a strong sense of earthquake. Houses in the earthquake zone were slightly damaged, mainly due to cracks in the houses. The earthquakes in the fifth, fourth and third degrees are weak and the earthquake damage is light.

Seismic activity

Nanyang city is located between the North China seismic belt of the North China plate and the South China seismic belt of the South China plate, and the seismic activity has the characteristics of north-south transition. Spatially, it can be divided into north seismic belt (Sanmenxia-Xuchang seismic belt) and south seismic belt (Nanyang-Xinyang seismic belt). The Sanmenxia-Xuchang seismic belt includes Sanmenxia, Luoyang, Zhengzhou, Kaifeng, Xuchang and Luohe. , nearly east-west, 400 kilometers long and 100 kilometers wide. It is bounded by Pingdingshan, Yexian and Nanyang-Xinyang seismic belt, which belongs to North China seismic belt. Nanyang-Xinyang seismic belt is about 300 NW, 370 km long and 125 km wide, belonging to South China seismic belt. There are many historical earthquakes with high magnitude and strong activity in the northern belt, while there are many modern earthquakes with strong activity in the southern belt. The seismic activity in the north-south belt is obviously controlled by seismic faults and distributed in a strip shape, especially in Nanyang. At present, the activity of Nanyang-Xinyang seismic belt is in the climax stage, and there is still the danger of earthquakes of magnitude 4 ~ 5, which mainly occur at the following structural intersection nodes: Xichuan Danjiang Reservoir structural node, Neixiang Mashankou structural node, Nanyang structural node, Tongbai structural node, Xinyang structural node, Huangchuan structural node and Shangcheng structural node.