Modern Express News (Reporter Hu Yumei and Chu Xihao) According to the measurement of China Earthquake Network , at 21:46 Beijing time on December 22, 2021, a magnitude 4.2 earthquake occurred in Tianning District, Changzhou City, Jiangsu Province (31.75 degrees north latitude, 120.0 degrees east longitude), with a depth of 10 kilometers.
After the earthquake occurred, Jiangsu Provincial Earthquake Bureau immediately conducted an emergency earthquake consultation. Based on preliminary analysis of structural characteristics near the epicenter, historical seismic activities, sequence type analogies and existing anomalies, it is believed that the possibility of a larger magnitude earthquake in the original earthquake area in the next few days is less likely to occur.
Why are there too many earthquakes in Jiangsu?
The small and medium-sized earthquakes of magnitude 3 and 4 are normal, don’t panic
11 On November 17, a magnitude 5.0 earthquake occurred in the Dafeng District, Yancheng, Jiangsu Province (33.5 degrees north latitude and 121.19 degrees east longitude). More than a month later, a magnitude 4.2 earthquake occurred in Tianning District, Changzhou...
Why are there many earthquakes in Jiangsu recently? Sun Shiyou, a researcher at the China Earthquake Network Center, analyzed that this earthquake belongs to the small and medium-sized level, and in history, it is normal for a magnitude 4 or 5 earthquake in Jiangsu to occur. He gave an example, in 1974, a magnitude 5.5 earthquake occurred in Liyang , and in 1979, a magnitude 6.0 earthquake occurred in Liyang; on February 10, 1990, a magnitude 5.1 earthquake occurred at the junction of Changshu City and Taicang County ; on July 20, 2012, a magnitude 4.9 earthquake occurred at the junction of in Gaoyou City and Baoying County, Yangzhou...
Sun Shiyou said that the magnitude 4 and 5 earthquakes are small and medium-sized earthquakes, and it is not a question of the fault zone. Generally speaking, major earthquakes are caused by fault zones. Small and medium-sized earthquakes are normal releases of energy inside the earth. "A 4.2-magnitude earthquake may occur anywhere in the world. Generally speaking, it will not cause disasters. Everyone does not need to be nervous and don't panic."
Will destructive earthquakes occur in the future ?
There is a small possibility of a larger earthquake in the original epicenter area recently
Changzhou After the earthquake occurred, many residents ran downstairs. After the
earthquake, the Jiangsu Provincial Earthquake Bureau immediately conducted emergency earthquake consultations and sent three batches of earthquake site work teams to Tianning District, Changzhou City to carry out disaster investigations, mobile monitoring, scientific investigations and other work.
According to preliminary understanding, the earthquake in Changzhou area has a strong tremor, the earthquake in southern Jiangsu and central Jiangsu and and areas are obvious, and there is a tremor in neighboring areas such as Shanghai and Zhejiang. At present, no reports of casualties have been received.
Many people are worried that after this, will a destructive earthquake occur? Modern Express learned that earthquakes are generally divided into isolated types, main shock-aftershock types, etc. After consultation by experts, it is believed that the possibility of a larger earthquake in the original epicenter area is less likely to occur recently.
According to analysis, since 1949, no earthquakes of magnitude 5.0 or above have occurred within a range of 50 kilometers of the epicenter. The largest earthquake with a magnitude of 3.3 earthquake occurred in Jingjiang, Jiangsu on March 3, 2000, causing no casualties.
Before the earthquake, " earthquake cloud " appeared in the sky?
" Earthquake Cloud " has no essential connection with earthquakes
Recently, magnificent and neatly arranged clouds appeared in the sky, including Nanjing. While netizens were photographing the clouds in the sky, they were curious. What had appeared before was an earthquake cloud? Did you predict the arrival of the earthquake in advance?
Experts explained this. Experts say that the so-called "earthquake cloud" on the Internet is mainly two types of hypercumulus and layer cumulus . These two types of clouds are prone to form "weird" appearances such as mesh (fish scales), wavy (ribs), floc, translucent, radial, pod-like, etc. The appearance of alcacuum clouds means that the weather is good, and the appearance of stratumocumulus clouds means that there will be rainfall. The entire process of cloud formation in
is completed in the atmosphere. "Earthquakes occur inside the earth, so there is no sufficient scientific basis to prove that there is an essential connection between the so-called seismic clouds and earthquakes." Sun Shiyou said.
At present, the Jiangsu Provincial Earthquake Bureau also posted a popular science video on Weibo to refute the rumor: "The earthquake cloud that can predict earthquakes" is a rumor.
Why do you think about the Yangtze River Delta region?
and the occurrence time
After the earthquake occurred, netizens in the Yangtze River Delta region all expressed a sense of tremor, and many areas were still far away, such as Nanjing's urban area was more than 120 kilometers away from the epicenter.
Sun Shiyou told reporters: "It is indeed not common for a magnitude 4.2 earthquake to have such a strong tremor. Generally speaking, areas with obvious tremors are only a few dozen kilometers away from the epicenter. It should not be felt if it is too far away."
He explained that such a situation may happen to be at night, and many people are in a static state or in a special position, such as high floors, etc. On the other hand, it is also related to the depth of the earthquake.
earthquake triggered earth crack ?
4.2 The power of a magnitude earthquake is not that great
There is a video of long cracks appearing on the asphalt road horizontally. Is it really that destructive?
" Such a situation should not occur." Sun Shiyou said that generally speaking, if the depth of an earthquake of magnitude 4.2 is not too shallow, it will not be highly destructive, and there will be no cracks in the ground. Such cracks in the video should be caused by other reasons, and may have cracked before the earthquake.
