2024-04-20 10:03:02
403 strong earthquake in Hualien (Photo/provided by Hualien County Government)
[周刊王CTWANT] The 403 Hualien earthquake was stronger than the 918 Chishang earthquake in 2022, but there was no ground rupture. In this regard, Wang Yu, associate professor of the Department of Geological Sciences of National Taiwan University, pointed out that the location of the fault zone of the 7.2 magnitude earthquake is probably in the East Sea. The epicenter of the main shock is. far from the earth, and the depth of the earthquake is deep. Therefore, the maximum ground elevation along the coast of Hualien Port is only regarding 45 centimeters, much lower than the 1 meter height of the 2022 Ikegami earthquake, so it does not There was no superficial break, which is a blessing among misfortunes.
On April 3, a strong earthquake with a magnitude of 7.2 occurred off the coast of Hualien. So far, there have been more than 900 mainshocks and followingshocks. However, the cause of this strong earthquake is still unknown and it is impossible to confirm it. which fault zone caused it. Wang Yu believes that it remains to be confirmed which fault rupture actually caused this earthquake. Judging from current data, the 403-strong earthquake is expected to be caused by the rupture of a fault under the Coast Range. from the sea near Yanliao Village in Hualien to the north, extending to the sea outside Hualien Heping Village, and the main underground fault ruptures are concentrated in the area of Hualien Town to the north of the Liwu River. 45 kilometers long, but has nothing to do with the Milun Fault.
Wang Yu further explained that the epicenter of the earthquake with a strength of 403 has been between 6 and 6.5 in the past 20 years, and no large-scale earthquake above 7 has occurred. is produced. What is more special is that this earthquake with a force of 7.2 did not cause any ground rupture. In contrast, 2 The ancient Chishang earthquake caused surface ruptures over more than 30 kilometers; The 0206 Hualien earthquake also caused surface ruptures along the Milun Fault and Lingding Fault.
Wang Yu also analyzed that the reason is probably that the fault zone of the 7.2 magnitude earthquake was located offshore, far from land, and the epicenter was deeper, so it did not cause rupture of surface area on earth only 40 to 45%. of the ground along the coast of Hualien Port was an elevation of one centimeter, extending south to the vicinity of Yanliao and north to Hualien and Heping, and the ground elevation of 45 centimeters n It’s not important. Taking 921 as an example, there was one more rise. more than 2 to 3 meters along the fault; the 2022 Chishang 918 earthquake. The highest elevation was more than 1 meter; even the big earthquake in Japan’s Noto Peninsula on New Year’s Day this year caused the coast to rise by up to 4 meters, so it is considered a blessing among the woes. As for how far the seabed surface has risen and whether there are fault ruptures on the seabed, further marine surveys and scientific research are needed.
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