Where did the biggest earthquake in the history of eastern China happen and what was its magnitude?

In eastern China, the largest earthquake in history was the Tancheng earthquake with magnitude of 8.5, and its epicenter was located in Gangouyuan Village, Linshu County. Because the extreme earthquake area affected Tancheng, Juxian and Linshu, the time of the earthquake was now 1668, so the specific severity of the disaster at that time was not accurately estimated.

tancheng

When the Tancheng earthquake occurred, most of the eastern part of China, even the eastern sea area and some Japanese areas were affected by seismic waves. In fact, the Tancheng earthquake is essentially an energy release activity caused by the activity of the land fault zone, which is the largest known earthquake fault zone in eastern China.

Moreover, the area near the Tan-Lu fault zone has not stopped seismic activity since ancient times, and it is a long-term active fault zone. According to the available data, if the Tan-Lu fault zone spreads around for about 200 kilometers, after 1400 years, there will be 1 earthquake with magnitude of 8.5, five earthquakes with magnitude of 7.0-7.9 and1earthquake with magnitude of 6-6.9 in these areas.

tancheng

More specifically, the Tancheng earthquake is located in the middle section of the Tancheng-Suqian fault zone, and there are four main underground faults, which are not only complicated in structure, but also strong in new activity.

What factors are related to the tragic degree of the earthquake?

Why do some people say that the Tancheng earthquake is more destructive than the Wenchuan earthquake? Judging from the impact of the earthquake, the 5. 12 Wenchuan earthquake caused more than 40 million people to be affected, nearly 70,000 people were killed, and the economic loss exceeded 800 billion, making it the most destructive and severely affected earthquake since the founding of New China.

The Richter scale of the Wenchuan earthquake was 8.0, and the highest epicenter intensity areas (Yingxiu Town and Beichuan County) were 1 1 degree, while the Richter scale of the Tancheng earthquake was as high as 8.5, and the intensity of the polar region reached 12 degree. In other words, in terms of the energy released by the earthquake itself, the Tancheng earthquake is indeed more destructive than the Wenchuan earthquake.

tancheng

Of course, it is also possible that the record of the Tancheng earthquake disaster was incomplete, but the tragic degree of the earthquake is not absolutely equal to the size of the earthquake. For example, the Tancheng earthquake happened at 7: 00 pm on July 25, which happened to be summer. Everyone didn't sleep and there were no high-rise buildings. Coupled with the low population density at that time, it was more likely that everyone would flee their homes in a short time.

However, the Wenchuan earthquake is different. It happened at 12, 14: 28: 04 in May. At this time, either the children are in class or taking a lunch break as I did at that time, which is why the earthquake will take many students' lives. Because our school has a fixed lunch break at noon every day in summer, when I rushed downstairs, I saw many students didn't have time to get dressed, and many of them were wrapped in sheets.

Wenchuan

Why can't anyone predict earthquakes until now?

There are many kinds of natural disasters, and the mountainous terrain is prone to debris flow in the post-earthquake rainstorm. Such a secondary disaster is foreseeable, just like reminding tourists not to go to the local area every summer after the Wenchuan earthquake. Another example is the flood in the south, which always happens in summer. We can prepare for flood control through rainfall forecast, but earthquakes are completely different.

Wenchuan

People who know something about the distribution of earthquake zones should know that many areas in China are located in the earthquake zone, just between the Eurasian earthquake zone and the Pacific Rim earthquake zone. The seismic belt includes the southeast coastal area, North China, Northwest China, Taiwan Province Province, Southwest China and the 23-day seismic belt. On the whole, the frequency of earthquakes in the west is the highest, and the earthquakes in the east have the greatest impact.

Although there are more than 5 million earthquakes every year on average, only a few of them are destructive, but earthquake disasters account for more than half of all kinds of disaster deaths in China. However, according to the sound principle of earthquakes, it is impossible for us humans to predict when and where earthquakes will occur in a limited time, let alone determine how much energy will be released by earthquakes that have not yet occurred. Therefore, at present, people's ways to deal with earthquakes mainly focus on two aspects: earthquake self-help and post-disaster rescue.