Modern Express News (Reporter Hu Yumei and Chu Xihao)" No wonder I was shaking violently on the stool "" It turned out that I was not dizzy, but I even asked for leave specially "" The iron rack in the office made a creaking sound, and the water in the water cup of my colleague opposite was shaking "...
At 13:54 on November 17, a magnitude 5.0 earthquake occurred in the Dafeng District, Yancheng City, Jiangsu Province (33.5 degrees north latitude and 121.19 degrees east longitude), with a focal depth of 17 kilometers. After the
earthquake, netizens from Jiangsu, Zhejiang and Shanghai reported coordinates, indicating a strong sense of tremor.
An earthquake in a sea area, why do you feel the large-scale area of Jiangsu, Zhejiang and Shanghai? What is the situation of the aftershock? Will it trigger a tsunami? A reporter from Modern Express interviewed relevant experts from Jiangsu Provincial Earthquake Bureau .
Why does tremor feel on a large scale?
The source of the earthquake is shallow, the coverage is relatively thick, and the
After the earthquake occurred, netizens from Jiangsu Yancheng , Nantong , Huai'an , and Nanjing all expressed a strong sense of tremor. They reported their coordinates one after another to tell their feelings when the earthquake came. "Nanjing obviously ran downstairs." Nantong also felt tremor. They were shocked when they were shocked at noon, so scared that they carried their kids downstairs before they even had time to wear clothes. "Huai'an had a strong tremor."...
Not only did most parts of Jiangsu feel, but Shanghai and Zhejiang Huzhou , Hangzhou, Shaoxing , and Ningbo .
For this reason, Zhejiang Provincial Earthquake Bureau also posted on Weibo that the epicenter is 45 kilometers away from the nearest coastline, 97 kilometers away from Yancheng , 276 kilometers away from Nanjing City, and 254 kilometers away from Shanghai.
Why does it feel shocking in large areas of Jiangsu, Zhejiang and Shanghai? Yang Yun, deputy director and senior engineer of Jiangsu Earthquake Station, explained that although the earthquake occurred in the sea area, the depth of the earthquake was 17 kilometers, which was a shallow-source earthquake; at the same time, the cover layer in most areas of Jiangsu is relatively thick, and the cover layer has an amplification effect on the earthquake; it is also the work time at noon, which is relatively quiet, and people's perception ability is more sensitive. Therefore, the public in Jiangsu, Zhejiang and Shanghai felt shocked.
Is this an earthquake-prone area?
The sea area is often earthquake-related, and there are moderate earthquakes, and many earthquakes are also common. Many netizens have found that earthquakes often occur in this sea area. For example: on December 12, 2019, a magnitude 3.2 earthquake occurred; on December 18, 2019, a magnitude 3.4 earthquake occurred... Going further, in 1984, a magnitude 6.0 earthquake occurred in the Yellow Sea waters not far from the epicenter.
Yang Yun introduced that this sea area is a relatively active area of moderate earthquakes in Jiangsu, and there have been many medium-strength earthquakes in history. "However, since 1997, it has been relatively calm and no earthquakes of magnitude 5 or above have occurred." What caused the earthquake in
? Some netizens speculated that it might be caused by the coastal fault zone in northern Jiangsu. In this regard, Yang Yun said that the coastal fault zone in northern Jiangsu is an earthquake fault zone roughly parallel to the Jiangsu coastline, but because it is in the sea area, it is currently not well-known. Will there be any aftershocks in
?
It is not ruled out that there is a sense of earthquake
After the earthquake occurred, the Jiangsu Provincial Earthquake Bureau immediately launched a third-magnitude earthquake emergency response and established the Provincial Earthquake Bureau Emergency Command. The Jiangsu Provincial Earthquake Bureau immediately conducted an emergency earthquake consultation and sent the first batch of earthquake site work teams to Dafeng District, Yancheng City to set up a mobile monitoring station near the coastline to continue to analyze and judge.
As of 16, the Jiangsu Provincial Earthquake Network did not monitor the occurrence of earthquakes above magnitude 1.0 in this sea area.
So, will there be any aftershocks? "At present, it is impossible to rule out the next sensitive earthquake." Yang Yun said that the types of earthquakes that occurred in Jiangsu historically are mainly isolated and main earthquake-aftershock types. After this earthquake, the possibility of similar earthquakes in the original earthquake area in the near future is relatively small, but the occurrence of sensitive earthquakes is not ruled out. Will
trigger a tsunami?
Don’t worry, you won’t be able to catch the tsunami after the
earthquake, many netizens reminded: Be careful of the tsunami.
Modern Express reporters learned that the world's recorded destructive tsunami happens once every six or seven years. Many countries in the world have experienced the tsunami, especially Japan. Every generation has experienced it. The English word "Tsunami" of the tsunami originates from Japanese.
So, will this earthquake trigger a tsunami? Yang Yun said that the public can rest assured that the earthquake will not trigger a tsunami. He explained that the occurrence of a tsunami requires certain conditions. To trigger a tsunami, an earthquake must reach a certain intensity and meet certain structural conditions, and a vertical misalignment occurs at the seabed.
According to statistics, in the past thousand years, there have been only 10 earthquakes and tsunamis in my country, with an average of about 200 years. my country's sea area is located on a wide continental shelf, with shallow water depths, within 200 meters, which is not conducive to the formation and spread of earthquakes and tsunamis. The coastal waters of Jiangsu are relatively shallow, not a high-incidence area for tsunamis.
Is there any warning for this earthquake?
2023, Jiangsu Province earthquake intensity speed report and early warning project was completed
After the earthquake occurred, many netizens asked, is there any warning information for this earthquake?
Wang Jun, senior engineer of Jiangsu Earthquake Station, said that at present, the Jiangsu Province earthquake intensity rapid reporting and early warning project is under construction and is expected to be completed in 2023. After completion, if an earthquake with a magnitude of and magnitude of occurs, the public can receive early warning information.
Modern Express reporter learned that the earthquake early warning system uses the principle that electromagnetic wave runs faster than seismic waves. Because electromagnetic waves run fast, after the earthquake, the earthquake warning information has already been taken first before the public receives normal earthquake information.
" Generally speaking, the further away from the epicenter, the longer the early warning time is. It can provide notification time in a few seconds to dozens of seconds." Wang Jun said.
Link: Since 1970, strong earthquakes in Jiangsu and neighboring areas
1974, a magnitude 5.5 earthquake occurred in Liyang
1979, a magnitude 6.0 earthquake occurred in Liyang
1987, a magnitude 5.0 earthquake occurred in Sheyang East
1990 February 10, a magnitude 5.1 earthquake occurred in daily life
July 20, 2012, a magnitude 4.8 earthquake occurred in junction of Gaoyou City, Yangzhou and Baoying County in Baoying County, Yangzhou on July 20, 2012, a magnitude 4.8 earthquake occurred in junction of in Baoying County, Yangzhou
2016 On October 20, 2020, a magnitude 4.4 earthquake occurred in Sheyang
On November 17, 2021, a magnitude 5.0 earthquake occurred in Dafeng waters
