All of Taiwan Feels Magnitude 6.6 Earthquake 1:41花蓮近海6.6強震 最大震度台東6弱

A magnitude 6.6 earthquake struck off the east coast of Taiwan on March 23 around 1 am. It was the fourth strongest since the 921 earthquake and luckily no major casaulties have been reported.


Many people were jostled awake when an earthquake struck at 1:41 a.m. on March 23. Others were woken up by earthquake alerts sounding on their phones. All of Taiwan felt this magnitude 6.6 earthquake, which was the biggest one so far this year. The epicenter was located off the coast of Hualien at a depth of 30.6 kilometers. The highest intensity of 6- was recorded in Taitung. This was the first quake with a magnitude of over 6 in the region in 49 years.

Chen Kuo-chang, Director, Seismological Center, CWB: “The rigidity of the terrain is comparatively higher, and it can endure a higher degree of deformation. When it reaches a certain point, as it did at 1:41 a.m., it begins to fracture. After it fractures, there is a continuous release of energy.”

Taiwan began experiencing a higher frequency of earthquakes starting in the second half of 2020. In 2021, there were five quakes with a magnitude of over 6, which was double the long-time average of 2.5 a year. The Central Weather Bureau's Seismological Center speculates that a seismologically active period may have arrived, but geologists had a different opinion.

Chen Wen-shan, Professor, Department of Geosciences, NTU: “Taiwan has so many active faults, around 30 to 40, so the earthquake frequency is high. They may appear to be concentrated in a certain period of time. My personal opinion is that we haven't yet arrived at a seismologically active period, because we need to understand the time of each and every fault.”

This earthquake was the fourth strongest since the 921 earthquake. There have already been over 100 aftershocks, including small ones that weren't recorded. The CWB says there may be magnitude 5 to 6 aftershocks over the next three days.

 

 

 

民眾被突然的大地震晃到站不穩,國家警報也狂響,東部深夜地牛翻身,全台都有感。凌晨1時41分的地震是今年目前最大、規模6.6地震,震央位在花蓮縣近海,地震深度30.6公里,最大震度為台東縣6弱,也是這個地區49年以來第一次發生規模6以上地震。

氣象局地震測報中心主任陳國昌表示:「它這個地體的剛性程度比較高,而且它能夠忍受更大的形變,這個到達某一個點這個點就是1時41分這個點,它開始破裂,那破裂之後就帶來一連串所謂能量持續的釋放。」

台灣從2020年下半年開始,地震頻繁度升高,尤其去年規模超過6的地震有5個,是長期平均值2.5個的一倍,地震測報中心推測地震活躍期可能已經來臨,但地質專家學者有不同的看法。

台大地質系研究所教授陳文山認為:「台灣這麼多,三四十條的活動斷層,那它們發震的頻率高,可能在某個時間裡面就會好像比較集中,我個人認為並不是說它已經到了活躍期的一個時間,因為你要知道,它是不是活躍期的一個時間來講,很重要是我們要對每個斷層的它的時間要了解就是。」

這起規模6.6地震是921大地震後,排名第4大的地震,從凌晨主震後發生的有紀錄地震,加上沒有紀錄、規模較小的餘震,已經超過上百個,氣象局不排除3天內還會發生規模5到6的餘震。
 

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