Geologists warn that the disaster caused by trench-type giant earthquakes will exceed 403 and 921 111
CNEWS Convergence News Network reporter Pan Yuqi/Reporting from Taipei
The Hualien 403 magnitude 7.2 earthquake has been followed by aftershocks. Earthquakes have occurred continuously since the evening of yesterday (22nd), with the maximum magnitude reaching 6.3. The Commander’s Building, which was originally listed as a dangerous building, and the Fukai Hotel under renovation also tilted during the earthquake. Hualien County Government It is announced that classes will be suspended today (23rd). Li Xidi, a professor at the Institute of Applied Geology of National Central University, bluntly said that the frequency of aftershocks in the past two days was a bit abnormal, and analyzed that if a giant trench earthquake occurs, Taipei may shake for up to 3 minutes, and the swing amplitude will be much larger than 403 and 921, reminding the public to prepare early to reduce disaster damage .
Li Xidi posted on Facebook that the first scary thing about trench-type giant earthquakes is that they will shake for a long time. He pointed out that the 403 earthquake shook Taipei for 1 minute and the 921 earthquake shook Taipei for 1.5 minutes, but a giant trench earthquake may shake Taipei for 3 minutes; a 1 to 2-minute earthquake may damage a house in 3 minutes. Dumped.
Geologists warn that trench-type giant earthquake disasters will exceed 403, 921 113
The second fear is that it will shake very loudly. Li Xidi explained that the low-frequency waves (0.5~1.0Hz) of giant earthquakes in the trench are very rich, which will cause the weak soil layer in the basin to react greatly, increase the amplitude, and also cause the earthquake to occur for more than 10 years. The upper floors of the building will react and expand the horizontal vibration amplitude, that is, the amplitude of the swing forward, backward, left and right, which will be much larger than the 403 earthquake and 921 earthquake experienced in the past.
In addition, the most terrifying thing is that “the building will collapse completely.” Li Xidi gave an example of the experience of the 1985 Mexican earthquake. A huge earthquake in a trench 400 kilometers away from the epicenter damaged about 1/3 of the houses in the capital Mexico. In addition, many pillars on each floor of ten-story buildings were completely broken, and the floors were stacked. Sandwich-shaped, with heavy casualties. He reminded, “Taiwanese people should prepare early to reduce disaster damage.”
Photo source: Reposted from Li Xidi’s Facebook, provided by the Central Meteorological Administration of the Ministry of Transport
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