Video/Taiwan experienced 10 earthquakes in a row. Meteorological Administration: All are aftershocks of the Hualien earthquake | 0403 Hualien Earthquake | Important News

Wu Jianfu, director of the Earthquake Forecasting Center of the Meteorological Administration, explained that a magnitude 5.5 earthquake occurred at 5:08 pm today in the south-south west of Hualien County Government. The earthquake depth was 10 kilometers. It was an extremely shallow earthquake. It caused Hualien Shuilian and Nantou Aowanda to reach magnitude 4. If the national alert standard is reached, a national alert will be issued for Hualien.

Wu Jianfu pointed out that four felt earthquakes occurred in succession after the earthquake, including 9 minutes, 12 minutes, 15 minutes and 17 minutes. Among them, a 5.3 felt earthquake occurred at 5:12, with a depth of 10 kilometers, and was limited to Shuilian, Hualien City. A national alert was also issued. It was determined that these earthquakes were the aftershocks of the 0403 earthquake. Due to the effect of high-rise buildings in the Taipei basin, people Feel the shaking a little bigger.

Wu Jianfu said that current statistics show that since April 3 to the present, there have been 935 main shocks and aftershocks. Because it is a magnitude 7.2 earthquake, it requires a long period of stress adjustment. During this period, aftershocks occurred in places where the earthquake was relatively blank; overall, The number of aftershocks will gradually become fewer and smaller, with most of them around magnitude 3, and earthquakes of magnitude 4 to 5 or above will occasionally occur.

Wu Jianfu said that although the two north areas are only level 2, they are more felt on higher floors and in the Taipei Basin; national alerts are issued for Hualien at 8 am and 12 am respectively; another reminder is that a front will arrive in Taiwan tomorrow, and the soil and rocks in the mountainous areas will be soft. , will cause dangerous situations after the earthquake, and it is recommended not to go to mountainous areas if it is not necessary.

Wu Jianfu further pointed out that most of the aftershocks detected previously were in the offshore north of Hualien and have now moved to land. It is necessary to use a larger-scale earthquake to release energy in a short period of time. There are no particularly abnormal situations.

Wu Jianfu explained that the energy released by 30 scale 6 earthquakes is about the same as one scale 7 earthquake, and the energy difference between scale 7 and scale 5 is 900 times; for a scale 5 earthquake, you may need to observe the aftershocks for about 2 or 3 weeks, and for a scale 5 earthquake, you may need to observe the aftershocks for about 2 or 3 weeks. The main shock of 7 will last longer.

Wu Jianfu said that the earth is a balanced system. When one place loses balance, it will adjust with stress in another place. If the rock formation cannot overcome it, it will adjust in the form of earthquakes. For example, there were some small earthquakes in Zhongpu and Baihe, Chiayi. , adjusting “like a seesaw.”

Will a situation like today’s nine-minute continuous earthquake happen again? Wu Jianfu said that energy is mostly released on a scale of 3 to 4. It is true that earthquakes of magnitude 4 to 5 will occur in the blank area in the past few days, and the depth of the earthquake is shallow.

Due to stress adjustment due to large-scale earthquakes, will there be more earthquakes in southern Hualien in the near future? Wu Jianfu said that if an earthquake occurs in this area, the stress in other areas will be relatively high. After the Hualien earthquake on April 3, there were small earthquakes in the Chiayi area. The southern Hualien area is also making adjustments. After gradual adjustments, the situation will be more stable.