Will there be an earthquake in Hefei in the future

Important announcement

At 22: 22 on April 6, 2009, an earthquake of magnitude 3.5 occurred in Liangyuan Town, Feidong County, Hefei City, our province. The epicenter was strongly felt, and it was widely felt in Hefei, causing no casualties or other disasters.

After the earthquake, experts in our bureau analyzed and discussed that it is unlikely that a bigger earthquake will occur in the epicenter and surrounding areas in the near future. So far, there is no abnormal earthquake activity in the epicenter and surrounding areas, and the so-called internal prediction opinions of the earthquake department are all rumors.

In the last two days, there have been some earthquake rumors in the epicenter and surrounding areas. Please don't listen to the spread, let the earthquake rumors lose the breeding ground and maintain a harmonious and stable living environment.

A very small number of criminals who deliberately create and spread earthquake rumors will be severely punished according to law once they are verified by the relevant departments.

Seismological Bureau of Anhui Province

April 9(th), 2009

How to identify earthquake rumors?

1. The "predicted" earthquake magnitude is very accurate, and the rumor that the time and place of the earthquake are very specific is a rumor;

2. Transnational earthquake prediction is a rumor;

3. The rumors of the earthquake are rumors;

4. Earthquake rumors with feudal superstitions and bizarre legends are rumors;

5. The specious earthquake anomaly is a rumor;

6. The rumor that the consequences of the earthquake are exaggerated is a rumor.

Earthquake popular science knowledge (1)

1, what is an earthquake?

In order to find out what the earthquake is, we should start from the earth.

The earth is mainly divided into three parts: crust, mantle and core. The average radius is 6370 kilometers, and the average thickness of the crust is 30-40 kilometers. It is composed of hard rocks, and most earthquakes occur in the earth's crust.

The earth is not a static world, and its internal and external movements never stop. No rock on the earth's crust can keep its original appearance without change. For example, horizontal strata will tilt, bend or even break after being stressed.

The change of the earth's movement produces a huge force, which acts on the unit area of the earth's crust, called geostress. Under the action of in-situ stress, the bending deformation of rock stratum is very slow at first, but when it exceeds the strength of rock, it will rupture the rock stratum, thus generating seismic waves, and reaching the ground is an earthquake. This kind of earthquake, also called tectonic earthquake, has the highest frequency and the greatest destructive power.

2. What are the three elements of an earthquake?

When an earthquake occurs, the place where the ground vibrates first is called the "source". The ground directly opposite the earthquake source is called the "epicenter", which is usually expressed by longitude, latitude and the place name. The area near the epicenter with the largest vibration and the most serious damage is called the "extreme earthquake zone". The vertical distance from the epicenter to the source is called the focal depth. On the ground, the distance from any point to the epicenter is called epicentral distance. The time when an earthquake occurs is called "the moment when an earthquake occurs". The time, magnitude and epicenter of an earthquake are collectively called "three elements of an earthquake".

3. What is the meaning of earthquake intensity?

The damage caused by earthquakes of the same scale is not necessarily the same; The losses caused by the same earthquake are different in different places. In order to measure the degree of earthquake damage, scientists "made" another "ruler"-earthquake intensity. Earthquake intensity is related to magnitude, focal depth, epicentral distance and soil conditions in the earthquake area. It's not the same magnitude as the earthquake.

Generally speaking, after the earthquake, the damage in the epicenter area is the heaviest and the intensity is the highest; This intensity is called epicentral intensity. From the epicenter to the surrounding areas, the earthquake intensity gradually decreased.

So the earthquake has only one magnitude, but the damage caused by different regions is different. In other words, an earthquake can be divided into several regions with different intensities.

China divides the intensity into 12 degrees, and the earthquake with different intensities has different influence and damage degree.

For example, the 1976 Tangshan earthquake, with a magnitude of 7.8 and an epicenter intensity of 11 degrees. Affected by the Tangshan earthquake, the earthquake intensity in Tianjin is eight degrees, and that in Beijing is six degrees, only four to five degrees away from Shijiazhuang and Taiyuan.

4. Where on earth are earthquakes prone?

The geographical distribution of seismic activity is uneven, and major earthquakes often occur only in some areas. The areas with frequent and intense seismic activity are called seismic zones, and the narrow seismic zones where many large earthquakes are concentrated are called seismic zones. There are two main seismic zones on the earth.

1. Pacific Rim seismic belt: It is distributed around the Pacific Ocean, roughly along the west coast of North and South America, passing through Aleutian Islands, kamchatka peninsula, Thousand Islands, Japanese Islands, Taiwan Province Island of China, passing through Philippine Islands and reaching New Zealand. It is the most active seismic zone on the earth, concentrating about 80% of the global earthquakes and releasing about 75% of the global seismic energy.

2. Eurasian seismic belt: From Indonesia to Myanmar, it passes through the Hengduan Mountains and Himalayas in China, and spans the Pamirs, Central Asia and the Mediterranean Sea, with a total length of about 20,000 kilometers. About 15% of the global earthquakes occur here, and the released seismic energy accounts for about 20% of the total global earthquake energy.

5. Is China an earthquake-prone country?

China, located between the Eurasian seismic belt and the Pacific Rim seismic belt, is a country with high seismic activity frequency, high intensity, shallow focal point and wide distribution. From 1900 to the end of last century, the number of people who died in earthquakes in China reached 550,000, accounting for 53% of the global earthquake deaths; In the last century, there were two world earthquakes in China, which killed more than 200,000 people. One was 1920 Haiyuan M8.5 earthquake in Ningxia, and 234,000 people were killed. The other time was 1976 Tangshan earthquake with a magnitude of 7.8, and 242,000 people were killed.

6. How serious was the loss of Tangshan earthquake?

1976 At 3: 49 a.m. on July 28th, a strong earthquake of magnitude 7.8 occurred in Tangshan, Hebei Province, which was the worst in the history of China and the world in more than 400 years. The earthquake damaged more than 30,000 square kilometers, and the affected area affected 14 provinces, municipalities and autonomous regions, accounting for half of the national territory. The earthquake killed 242,400 people, 160 people were seriously injured and 360,000 people were slightly injured. Tangshan was in ruins after the earthquake, with 5.3 million houses collapsed and economic losses of about 654.38+0 billion yuan. In the earthquake, the train derailed, the bridge collapsed, and the water supply, power supply, transportation and communication systems were seriously damaged and completely paralyzed.

7. Which earthquake killed the most people in China's history?

It was 15561October 23rd, an earthquake of magnitude 8 occurred in Huaxian County, Shaanxi Province. According to historical records: "It is strange that 830,000 famous people were killed by soldiers and civilians in the official history, and there are countless unknown and unreported people." The hardest hit area is 280,000 square kilometers, and the intensity of the extreme earthquake zone is 12 degrees. The earthquake has spread to more than half of China, with a feeling range as far away as Fujian, Guangdong and Guangxi.

8. What is an earthquake precursor? What are the common precursors?

The anomalies related to earthquakes in nature before earthquakes are called earthquake precursors. Include microscopic precursors and macroscopic precursors. Common earthquake precursor phenomena include: abnormal change of groundwater, abnormal reaction of animals, crustal deformation, small earthquake activity, ground sound, ground light, geomagnetism, gravity change, geoelectric change, in-situ stress change, change of radon content or other chemical components in groundwater, and change of seismic wave velocity.

9. What are the abnormal changes of groundwater before the earthquake? What interference should be eliminated?

The fluctuation of groundwater level, discoloration, odor change, flowering, bubbling and sudden change of hot spring water temperature may all be earthquake precursors. However, the change of groundwater is a very complicated phenomenon, and we must pay attention to eliminating the interference of precipitation (rain and snow), drought, river fluctuation, snow melting, artificial pumping irrigation, environmental pollution and other factors.

10, is it necessary to have an earthquake when the weather changes suddenly?

No, there are indeed some records of meteorological anomalies before major earthquakes, but the relationship between meteorology and earthquakes is very complicated. Even if there is a certain correlation, it is indirect and can only work under certain special conditions. For a region, weather changes often occur, but destructive earthquakes rarely occur. Some people think there will be an earthquake as soon as they see the weather change. This kind of worry is completely unnecessary.

1 1. Does the abnormal living habits of animals mean that there will be a big earthquake?

Not necessarily. Because there are many reasons for the abnormal living habits of animals: for example, weather changes, living conditions changes, biological interference, changes in feeding conditions, environmental pollution, etc. may all cause abnormal living habits of animals. In addition, the change of animal physiological state and human observation illusion may be regarded as abnormal. Before determining whether this anomaly is related to the earthquake, we should identify the true and false animal anomalies.

Earthquake prediction and its release

1, earthquake prediction level in China.

We know the principle and law of earthquake preparation, but we haven't fully understood it. We can predict some types of earthquakes to some extent, but we can't predict all earthquakes. Long-term and long-term forecasting with large time scale has certain credibility, but the success rate of short-term and imminent forecasting is still relatively low.

2, the provisions of the earthquake prediction

Earthquake prediction is generally issued by the provincial people's government. In case of emergency, the people's government of the city or county may issue an imminent earthquake forecast within 48 hours and report to the superior at the same time. Earthquake prediction in Beijing was put forward by Seismological Bureau of China, approved by the State Council, and released to the public by Beijing Municipal People's Government. No other unit or individual has the right to publish earthquake prediction news.

I hope the landlord knows, thank you.