Li Siguang predicted four places where great earthquakes would occur. Where are they? I heard that there have been three earthquakes. Is there anything else in Linfen?

The seismic activity in China is mainly distributed in 23 seismic zones in five regions. According to geomechanics, China can be roughly divided into 20 seismic zones.

1. Taiwan Province province belt;

2. Coastal areas of Fujian and Guangdong;

3. Northeast deep seismic belt;

4. Tan-Lu zone;

5. Hebei plain belt;

6. Haiyuan-Songpan-Ya 'an Belt;

7. Shanxi belt;

8. Weihe Plain Belt;

9. Yinchuan Belt;

10. Lanzhou-Tianshui belt;

1 1. Hexi Corridor;

12. Mabian-Qiaojia-Copper Kelp;

13. Mianning-Xichang-Yufu Belt;

14. Tengchong-Lancang River belt;

15. Ailao mountain belt;

16. Luhuo-Ganning belt;

17. Huashixia belt;

18. Lhasa-chayu belt;

19. western Tibet;

20. Tianshan belt

The North China earthquake region is the region with the strongest seismic activity in eastern Chinese mainland and the region with the strongest late Quaternary tectonic activity in China. There were 5 earthquakes with M ≥ 8, and the largest earthquake was 1668 Tancheng M ≥ 8.5. Fault activity has obvious zonation from west to east, and potential seismic source areas are distributed along these tectonic active zones.

The North China seismic belt includes six seismic belts, and our city is mainly affected by the North China Plain seismic belt and the Tan-Lu seismic belt. Among them, the advanced potential seismic source areas in the North China Plain seismic belt are: 2 potential seismic source areas of magnitude 8, 7 potential seismic source areas of magnitude 7.5 and 7 potential seismic source areas of magnitude 7; The Tan-Lu earthquake belt has 1 high-level potential seismic source areas, with 5 of magnitude 7.5 and 8 of magnitude 7.

Tanlu fault zone is a main fault zone in a series of NNE giant fault systems in East Asia continent. It extends over 2,400 kilometers in China, passing through different tectonic units in eastern China. It is large in scale and complex in structure. It is the combination zone of differential movement of crustal fault blocks, the normal zone of geophysical field and the active zone of deep magma. It was formed in Mesoproterozoic. Experienced a multi-stage structure. It is not only a "longevity" deep fault zone dominated by shear movement, but also an active fault zone dominated by dextral thrust, and it still inherits a new tectonic movement mode in the near future. At the same time, it is also a seismic activity zone with obvious segmentation and different degrees of activity.

According to statistics, since 1400, there have been 1 earthquake of magnitude 8.5, five earthquakes of magnitude 7.0-7.9 and1/earthquake of magnitude M6-6.9 within 200 kilometers around the Tanlu fault. Among them, there were 8.5 earthquakes 1 time in the middle section (Shenyang-Suqian section) and 7.0-7.9 earthquakes. Strong earthquakes of magnitude 6 or above are mainly concentrated in the middle section of the Tan-Lu fault zone. The main earthquakes are Juxian-Tancheng M8.5 earthquake on July 25th 1668, Bohai Bay M7.5 earthquake on June 3rd 1888, Haicheng M7.3 earthquake on February 4th 1975 and July 1969.

Since 1990, the junction of Tanlu fault and Sulu has been listed as the key monitoring area of seismic risk by the State Seismological Bureau. 1On September 20th, 1995, an earthquake with M = 5.2 occurred in Cangshan, Shandong Province, and a small earthquake swarm with M = 4.3 occurred in Qingdao, Shandong Province in June, 2003. The seismic activity in this area deserves our attention and study.

Tanlu fault is located at the junction of Jiangsu and Shandong, and has been listed as the key monitoring area of seismic risk by the State Seismological Bureau since 1990. The Tancheng-Lujiang fault zone is located in a fault section with strong compression and dextral torsion. Because it bears large normal stress and shear stress, it is easy to accumulate the energy of large earthquakes, but it is difficult to release it in the form of small and medium earthquakes, so the earthquake intensity in this section is large and the frequency is low.

The earthquakes that occurred in this seismic zone are:

1668 Shandong Tancheng M8.5 earthquake

1969 Bohai earthquake with magnitude 7.4

1974 Haicheng m 7.4 earthquake

1983 1 1.7 Heze, Shandong province, earthquake with magnitude 5.9.

65438+1September 20, 1995, Cangshan County, Linyi City, Shandong Province, with an earthquake of magnitude 5.2.

The activity of Qingdao, Shandong, earthquake swarm with M = 4.3 in June 2003.

On February 9, 2006, an earthquake of magnitude 3.5 occurred in Tangtou Town, Linyi City.

It is said that before his predecessor died, Li Siguang was obsessed with the Tan-Lu earthquake zone. He once predicted that in the event of an earthquake, its destructiveness may be several times that of the Tangshan earthquake. I hope that the recent earthquake-proof measures taken on Mount MENT in China are positive and effective.

At that time, Li Siguang predicted four possible earthquake zones in China:

1, Tangshan-Xingtai (earthquake)

2. Xinjiang (earthquake)

3. Yunnan (earthquake)

4. Shandong Tancheng-Rizhao or Lianyungang (no earthquake)

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