The weather in Xi 'an is particularly changeable this year. Will there be an earthquake?

The first part: Wenchuan people are homeless, waiting for food and drinks in the aftershock.

The second part: Shaanxi people have housing, food and drink, waiting for aftershocks.

Horizontal criticism: the shame of expert ancestors

Well said, no matter how strong the aftershock is, it can't beat the main shock on May 12.

The knowledge of aftershocks of this earthquake is popularized.

1, is the earthquake distribution related to geographical location?

A: Yes, the earthquake happened at the junction of moving plates. In Sichuan, it is an earthquake belt from Yunnan along Hengduan Mountains to Ganzi-Aba-Qinling Mountains. The actual aftershock activity area of this Wenchuan earthquake is: Wenchuan-Maoxian-Beichuan-Qingchuan area (northeast of the epicenter of Wenchuan earthquake), and 300 kilometers belong to the fault zone. It belongs to the high-risk area of aftershocks.

2. What are the characteristics of this earthquake and what is the relationship with aftershocks?

A: The earthquake was caused by the backlog of the Qinghai-Tibet Plateau plate. It is a thin-skinned thrust earthquake, which is often strong and shallow, and the energy cannot be released at one time, so the aftershocks continue, sometimes lasting for a month or two or even longer.

3. What are the characteristics of aftershock magnitude of thrust earthquake?

A: There are many aftershocks and they last for a long time. Aftershocks will gradually disappear until the fault zone is basically calm. 92 1 in Taiwan Province Province was also a thrust earthquake. On the day of the 92 1 earthquake, there were many aftershocks. The biggest impact was at 2: 16 in the morning less than an hour later, and the Richter scale reached 6.8, followed by 7.3. Then at 8: 14 am on September 22nd, the scale of Ruishi reached 6.8. And at 7: 00 a.m.15 on September 26th, the scale of Ruishi reached 6.8.

4. Characteristics of aftershock magnitude:

A: Because the magnitude of this thrust earthquake is large and unidirectional, it is normal for aftershocks of magnitude 6-7 to occur. In fact, at least five aftershocks of magnitude 6-7 have been recorded. According to this earthquake feature, it is normal even if an aftershock of magnitude 7-7.5 occurs.

5. If an aftershock of magnitude 7-7.5 occurs, what is the range of perception and damage?

A: Even the most conservative and prudent calculation and analysis (after considering the damage to houses caused by the last earthquake): If an earthquake of magnitude 7-7.5 occurs in the aftershock area 300 kilometers from Wenchuan to Qingchuan, the safe areas that will never cause damage are Dazhou, Nanchong, Suining, Neijiang, Zigong, Yibin, Luzhou, Leshan, Xichang, Panzhihua and most parts of Chongqing (including the main city). If the magnitude of the earthquake is lower than. The whole Chongqing. The only things that need attention are: dilapidated buildings with poor endurance in Chengdu, Ya 'an, Deyang, Mianyang and Guangyuan, and houses damaged by the last earthquake. Only Guangyuan, Shaanxi to Baoji Mountain (excluding Baoji City) needs attention (considering geological structure and distance). Gannan also needs attention.

6. Does the government earthquake information release need to be improved?

A: Yes, in this earthquake, the safety zones of dozens of safe prefecture-level cities such as Chongqing, Zunyi, Shaanxi and Sichuan should not release evacuation information at all, causing people to panic. After the aftershock forecast is released, it is necessary to explain the scope of damage and avoid large-scale panic. Aftershocks will only have an impact on the geology, damaged houses and reservoirs in this disaster area. In fact, it has no harm to most cities in Sichuan.

Does the aftershock of Pingwu M 5 belong to the predicted M 6-7?

Answer: No, actually, compared with the earthquake of magnitude 7.0, the energy released by the earthquake of magnitude 5.0 is only close to11000, and compared with the earthquake of magnitude 8.0, the energy released is only about 1/30000. Accurately speaking, since the earthquake, there have been almost 30 earthquakes with magnitude greater than 5.0. Suppose you say 20.