The epicenter is here!

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WeChat public account: Earth Knowledge Bureau

NO.2297-Sichuan Luding Earthquake

Author: Naham

Drawing: Watermelon / School Draft: Chaogan / Editor: Bowl Chicken

According to the formal determination of the China Earthquake Network, at 12:52 on September 5, 2022, a magnitude 6.8 earthquake occurred in Luding County, Ganzi Prefecture, Sichuan Province (29.59 degrees north latitude, 102.08 degrees east longitude), with a depth of 16 kilometers.

(Figure: China Earthquake Network)

This Sichuan earthquake, the provincial capital of Chengdu is obvious. Ganzi, Aba, Liangshan, Ya'an and other places have a sense of earthquakes. Based on the rapid evaluation system of the Sichuan earthquake disaster, the highest intensity of the earthquake reaches a degree.

For a while, the focus of the people across the country gathered in Sichuan.

This episode in Luding in western Sichuan

Special Earthquake

In accordance with conventional conventions, when the disaster prevention department releases earthquake briefings, the information often includes four elements, namely time, epicenter address, earthquake level, and depth of earthquake sources.

Specifically, the expressions of the earthquake address are often expressed in the formal administrative divisions of the county -level administrative units+coordinate points. As for the more detailed level of place names such as the streets of the township or village, they often appear in special reports or other more detailed news introduction. As the Sichuan earthquake, the earthquake is located in Luding County, so it is also directly called the Luding Earthquake.

All key elements are covered

(Picture: China Earthquake Network Center)

Generally speaking, after a major earthquake, people who pay attention to the earthquake are looking for the specific location of the earthquake in accordance with the official briefing. Under normal circumstances, the address of the major earthquake is generally a small place that is not famous (except for various unmanned areas or well -known nature reserves with great regional span, only small place names are discussed here).

However, this Luding earthquake, the actual situation is abnormal. When the careful people are consulting the earthquake place, they will find out that the earthquake address is actually located in the famous tourist attraction of the country, Hailuogou!

Having said that, the scenery of Hailuogou

It is also formed due to geological movement (picture: map insect creativity)

Hailuogou is located in the Gongga Shandong slope, known as the king of Shushan. Earlier, it was a well -known tourist attraction in the surrounding area. It is also a famous outdoor travel route. Tourists who usually come and go are mainly Ya'an, Xichang, and Chengdu.

Later, with the southern line of the Sichuan -Tibet Highway, the famous G318 National Highway, the continuous development and popularity of tourism along the line rose. Hailugou, which belongs to the Affiliated Line of Sichuan -Tibet, has gradually become well -known in the country, and officially upgraded into a 5A scenic spot in 2017.

Although Hailuogou is not on National Highway 318

But it does not prevent it from the trip of the 318th trip

(Figure: Tuwa Creative)

In the Hailuogou area, it is Luding County in the formal administrative belonging. In fact, it is located in the junction of Luding County, Ganzi Prefecture and Ya'an City, which is far from Luding County. convenient. At the same time, due to the factors of the distance, Luding County and Ashami County have limited affected situations compared to other parts of the county.

Various main urban areas involved in this earthquake

It is not the focus of this earthquake disaster

So, where is the nearest population settlement around Hailuogou? Generally speaking, the nearest population near the scenery of the natural scenic spot is often unknown. Hailuogou is different. It is also a small population nearby nearby. This is Musician Town, which is generally known as the ancient town of Musi.

This is also the place to hold the West Conference of the year

(Figure: Tuwa Creative)

Although the ancient town of Musician is recorded in local historical documents, the reason why it can get angry later is due to Hailugou. Today, the Town of Musician has two elements at the tourism level. One is that it is the element of an attraction, and the other is the element of the transit hub of the traveler to the conch, and the latter is the main.

Maybe after seeing the location and functional relationship between the earthquake, Hailugou, and Musician ancient town, they will feel that a large-scale scenic spot such as Hailu Gou-Mo Xi, and the affected tourists will become very much.

The Hailuogou Scenic Area is actually in Moxi Town

But what people usually say

Often refers to the very lively ancient town

(Figure: Tuwa Creative)

In fact, it is not. Since the new crown epidemic occurred in Ganzi Prefecture on August 26, coupled with the relevant situation of the Chengdu epidemic and the arrival of the opening season, although the Hailuogou and Musician Town Scenic Area have not been closed, it is obviously not the tourists to the scenic area. too much.

Fresh Water River Fracture Belt

After the earthquake, the Sichuan Earthquake Administration gave a comprehensive analysis of the earthquake at the first time: the epicenter was located near the southern section of the Fresh Water River Fracture Belt, and was the main earthquake-the aftershock-type earthquake. According to the regional structure, historical earthquake activities, and seismic sequence types, the possibility of a larger earthquake in the original earthquake area in the near future, and the aftershocks will continue for a period of time.

Surrounded by the epicenter of the past one year

Earthquake distribution map above 5.0 or above

So, what is a fresh water river broken belt?

The Fresh Water River Fracture Belt is one of the three main broken belts in Sichuan Province. The remaining two main breakthrough belts are also famous. One is the main broken belt of Longmen Mountain. The 2008 Wenchuan earthquake occurred here. Belt, the important representative is the Great Earthquake in 1952.

3 major main broken bands form "Y"

This episode is almost in the center of "Y"

The Fresh Water River Fracture Belt is located on the east margin of the Qinghai-Tibet Plateau, with a total length of about 350 kilometers, and the overall direction of the northwest-southeast (non-rigorous expression). From the north of Ganzi Kasu, the area of ​​Tianwan in asbestos in the south, and the middle Jingjingyu, Furnonghuo, Daofu, Qianning, Kangding (partial lines with the northern Sichuan -Tibet line), and finally in the asbestos with the Anning River. Connect.

The broken zone is roughly divided into the northern western section and the South East section of Huiyuan Temple in Qianning. Among them, the northern western section includes the secondary faults such as the furnace Huo, Daofu and Qianning. The four branches of rivers, Kangding, Folding Pond, and Moxi are composed of four branches.

On the other hand, the Fresh Water River Fracture Belt and Ganzi -Yushu Fracture together constitute the northern border of the Sichuan -Yunnan diamond land and the southwestern border of the Bayankra plot. East direction has caused a high -speed left -hand slippery movement and strong and frequent earthquake activities such as fresh water, Anning River, and Zimu River.

In addition to the three main broken bands in Sichuan

There are many other broken belts

In addition to Luding, asbestos and other places should also pay attention to

After a earthquake, the focus of public attention often focuses on the corresponding location of the main earthquake mentioned in the news, and ignores other areas of neighboring areas.

Just as the Wenchuan earthquake occurred, the attention of Beichuan and Dujiangyan in the adjacent areas was smaller than Wenchuan. And the 6.9 -level Qinghaimen earthquake on January 8 this year, the actual seizure is located in the Ganqing border area. Zhangye, Gansu, is also affected by the earthquake, but the attention is obviously not as good as Qinghai.

The gate source earthquake in January this year

The epicenter is also near the junction of the administrative division

In short, earthquake disasters cannot just look at the administrative divisions, and the surrounding areas should be paid attention to, especially those epicenters are located near the junction. Sometimes, there may be a epicenter of the earthquake in county A, but the affected situation in the county B surpassed the county.

This Luding earthquake is also a typical example of the earthquake in the border area. Although it occurs in Ganzi Prefecture, it is actually near the junction of Ganzi Prefecture and Ya'an. County. After the earthquake, many roads in Ashaima County were interrupted due to the collapse, such as the famous G108 National High -Cotton section in Sichuan Province.

This earthquake has repeatedly occurred in Ya'an asbestos in Ya'an

If it is "confused" by the administrative division

It will be arbitrary that these small earthquakes have nothing to do with this earthquake

(Picture: China Earthquake Network Center, the red box is the main earthquake)

Although the Hailuogou-Mosixi area is far from the main road of the southern Sichuan-Tibet line and the main road of Chengkun, its current road conditions still have the traffic status of "Sanchakou".

The provincial roads from Luding to asbestos are here, and the corresponding highways are construction. In addition, Kangding New Town (Yulin) to the Yusan Highway to Moxi is also the closest passage of the local government to the state government.

However, most of these roads are located in rugged mountains. Affected by the earthquake, the collapse or bridge damage has occurred in some sections, and traffic is temporarily blocked. For the special traffic conditions in the earthquake area, the National Highway 318 (Ganzi Section), which has a huge strategic role, is currently only allowed to enter, ensuring that all rescue channels are unblocked.

National Highway 318 and Yu Mo Highway and Luding · Shim Cotton Highway

A basic disk of traffic in the Hailuogou area

After the earthquake, they are the lifeline of disaster relief

As of 21:00 on the same day, a magnitude 6.8 earthquake in Luding County, Sichuan has killed 30 people. After preliminary exploration, the communications of Moxi Town and Yanzigou Town were interrupted. The earthquake also suspended some substations and transmission lines in Ganzi, Ya'an and other places.

The secondary disaster after the earthquake also needs to pay attention to it. The meteorological department reminds that the rainy weather in Luding County has been in the three days from this day. It is necessary to prevent the adverse effects of rainfall weather on traffic, rescue and emergency response. In addition, the geological conditions are fragile after the earthquake, and it is necessary to strengthen the prevention of possible disasters such as landslides, mudslides, and collapse that may occur.

Comprehensive earthquake conditions and meteorological conditions, it is expected that in the next 72 hours, Kangding City, Luding County, Kowloon County, Yajiang County, Ya'an City, Yingjing County, Hama Prefecture, Delco County, Liangshan Prefecture, Gan of Liangshan The risk of geological disasters in 10 counties (cities) and 10 counties (cities) such as Luoxian (yellow warning).

According to the distance from the earthquake, you can clearly see

Except for Ganzi Prefecture and Ya'an City

Some counties in Liangshan Prefecture also belong to the earthquake zone

Also need to pay attention to geological disasters

Reference materials:

1. Historical earthquake on the Fresh Water River Fracture Belt-Deng Shaohui

2. The probability of the recurrence of the inland earthquake in the Fresh Water River Fracture Belt

3. Http: //ngac.org.cn/newmytheme.html? Guid = 8adaf1d581ad04C601830C1A378301E8E8

4.http://www.scdzj.gov.cn/dzpd/dzzj/scgzzldx_1662355316805//

5.https://news.ceic.ac.cn/cc20220905125218.html

6.https://www.cenc.ac.cn/stzxx/index.html

7.https: //eartquake.usgs.gov/earthquakes/eventpage/us7000i59t/executive8. Sichuan Luding 6.8 Earthquake Disaster Express

9. Fresh water rivers based on cross-fault measurement are the characteristics of today's activity and their relationship with the strong earthquake-Li Laue, Ji Lingyun, Li Yujiang, Zhanwei

*The content of this article is provided for the author, which does not represent the position of the Earth Investment Bureau

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