According to the China Earthquake Administration's measurement, a magnitude 3.6 earthquake occurred in Gujiao City, Taiyuan City, Shanxi Province at 08:27 on February 20, 2022, with a depth of 9 kilometers. The earthquake was more obvious when the earthquake occurred in Gujiao City, Shanxi, and some areas of Taiyuan City also had obvious tremors. Regarding this earthquake, we have collected questions that netizens are concerned about and answered in a concentrated manner.
1. Question: Is the magnitude 3.6 earthquake that occurred in Gujiao City, Taiyuan City, Shanxi Province on February 20, 2022 a foreshock activity of a larger earthquake? Will destructive earthquake in Taiyuan, Shanxi happen in the near future?
Answer: Preliminary analysis and judgment: The magnitude 3.6 earthquake that occurred in Gujiao City, Taiyuan, Shanxi is not a pre-seismic activity of a major earthquake. Based on the current earthquake precursor data collected, it is determined that there will be no destructive earthquakes in Taiyuan, Shanxi in the near future.
2. Question: Why did the magnitude 3.6 earthquake occurred in Gujiao City, Taiyuan City, Shanxi Province on February 20, 2022? Why did the magnitude 3.6 earthquake occur in Gujiao City, Taiyuan City, Shanxi Province not have a big magnitude , but the tremor of Gujiao City is very strong?
Answer: According to the earthquake epicenter data provided by the China Earthquake Administration, this 3.6-magnitude earthquake in Gujiao City, Taiyuan, Shanxi is located in the northwest of Gujiao City. Since the epicenter of this earthquake is close to Gujiao City, there was a clear sense of tremor in the urban area of Taiyuan, Shanxi Province when the earthquake occurred. This earthquake should be a direct urban earthquake. Urban earthquakes refer to earthquake activities at the epicenter of the earthquake below the city or below the surroundings of the city. The characteristic of urban direct earthquakes is that the sensation of small earthquakes is relatively obvious and strong. A strong earthquake can cause certain destructiveness, and a strong earthquake can cause extremely serious destructiveness.
3. Question: Is there any correlation between the magnitude 3.6 earthquake in Gujiao City, Taiyuan City, Shanxi on February 20, 2022 and the magnitude 2.7 earthquake in Fenyang City, Luliang City, Shanxi on February 14, 2022?
Answer: It is preliminary to judge that there is no direct correlation between the magnitude 2.7 earthquake that occurred in Fenyang City, Luliang City, Shanxi on February 14, 2022 and the magnitude 3.6 earthquake that occurred in Gujiao City, Taiyuan City, Shanxi on February 20, 2022. These two earthquakes belong to different earthquake faults or earthquake fault zones. Although the straight-line distance between the two earthquakes is less than 100 kilometers, there is no correlation between the two earthquakes.
4. Question: Which fault zone is located in the magnitude 3.6 earthquake that occurred in Gujiao City, Taiyuan City, Shanxi Province on February 20, 2022?
Answer: It is preliminary judged that the magnitude 3.6 earthquake that occurred in Gujiao City, Taiyuan City, Shanxi Province on February 20, 2022 is located in the Anzhuang-Jiulongta-Hongyan Village Fault Zone. The seismic fault distribution in the Chengda mine area of Gujiaoshi Town, where the epicenter of this earthquake is located is relatively complex, but it is mainly composed of small and medium-sized seismic faults or faults. [Picture from the paper: Research on the development characteristics of fault structure in Gujiao Mining Area in Shanxi]
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