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Turkey earthquake more powerful than 1999 Jiji earthquake: seismologists

Turkey earthquake more powerful than 1999 Jiji earthquake: seismologists

2023-02-08

For many people, the earthquake in Turkey has brought back memories of the 1999 Jiji earthquake, which left thousands dead in Taiwan’s central region. Seismologists say that the quake in Turkey was even more powerful, caused by a fault that is 200 kilometers long. They say that Taiwan may not see such a powerful tremor on land, as the longest fault is just 100 kilometers long. But there are faults off the east coast that are longer and can trigger quakes with magnitudes higher than 7.

The magnitude-7.8 earthquake in Turkey has captured global attention. For Taiwan, it was a reminder of disasters past.

Just over 20 years ago, the 1999 Jiji earthquake, with a magnitude of 7.3, killed thousands in Taiwan. Experts say that quake was much milder than the one in Turkey.

Chen Kuo-chang
CWB Seismological Center
The earthquake had a magnitude of 7.8. Compared with the 1999 Jiji earthquake, it was about twice as powerful. The Chelungpu Fault in Taiwan is 112 kilometers long. For an earthquake that powerful to happen it would need to be about 150 kilometers long. We’ve been carrying out surveys in Taiwan, but so far we have not found fault lines that long.

Experts say fault lines off the coast of Hualien and Taitung are the ones to watch out for.

Voice of Chen Wen-shan
Former NTU geosciences professor
The fault lines off the coast are longer. The only one which could be able to trigger an earthquake like that actually did so already. It’s a fault line on the seabed off the coast of Hualien to the north. In 1920, it caused an earthquake with a magnitude of about 7.8.

Chen Kuo-chang
CWB Seismological Center
Over the past 30 or 40 years, all the bigger earthquakes struck off the east coast. Meanwhile, the west coast has just been building energy, except for the 1999 Jiji earthquake. We should still be cautious.

In the latter half of 2022 several powerful earthquakes shook the east coast, including one in Taitung on Sept. 18 and another one in Hualien in December. The most recent one was a 4.4 quake on Wednesday morning, off the coast of Yilan. The Central Weather Bureau says it will continue collecting seismic data about Taiwan, urging the general public to not be overly worried, as building codes require structures to be resistant to shaking.

土耳其強震災情慘重 台灣身處地震帶引關注

2023-02-08

土耳其大地震引發全球關注,台灣位於地震帶,也想起當年921場景,地震中心主任陳國昌估算,土耳其地震能量是當年921的兩倍。不過,當地斷層約200公里,台灣最長的車籠埔斷層只有一半,約100公里,所以預測發生同樣規模地震機率不高。地質專家陳文山則指出,花蓮北部海底過去曾發生過規模7以上地震,值得關注。

土耳其規模7.8強震全球關注,台灣身處地震帶,歷歷在目。

20多年前,規模7.3的921地震,台灣死傷慘重,這次土耳其強震能量,更驚人。

[[地震中心主任 陳國昌]]
“這次所量到的規模7.8,如果跟921來比較的話,大概差不多差2倍的能量,車籠埔斷層大概112公里,那如果要發生到那麼大的地震,大概差不多要150公里,(台灣)地表面上我們在地質調查所,到目前為止沒有那麼長的”

專家認為,值得關注的,反而是花東外海斷層。

[[聲源:台大地質系退休教授 陳文山]]
“海域裡面斷層長度就會比較長,唯一有可能的,也曾經發生過的,就是在花蓮的北邊海底,那裡在1920年發生過一起,大概也是規模7.8的地震”

[[地震中心主任 陳國昌]]
“這30、40年,所發生比較大的地震,都是在東部外海,西部地區所累積的能量,其實除了921之外,我們其實還是要小心”

2022下半年,先是台東918大地震,緊接著12月又碰上花蓮地牛翻身,今天清晨宜蘭近海則發生規模4.4地震,不過目前台灣相關數據還在研究,建築抗震能力也穩固,地震中心提醒民眾別過度恐慌。

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