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Mt.Datun quake not a sign of impending destructive quake (2014/02/12)

Experts say fears of a destructive seismic or volcanic event occurring in northern Taiwan are overblown. Area residents were rattled shortly after midnight Wednesday when a magnitude 4 earthquake struck the Taipei area.

From this monitor you can clearly see a quake take place Wednesday at half past midnight. It was the largest tremor to shake Taipei’s Shilin District in 26 years.

Although the earthquake was only magnitude 4.0, the epicenter was Mt.Datun, which is very near Taipei. It was the third largest tremor recorded in the Shilin area, leading some residents to worry that Mt.Datun may become active again.

Chen Hong-yu / guarantee
NationalTaiwanUniversity
This mini-earthquake is probably just a general release of stress. I think it’s quite a positive phenomenon and doesn’t indicate there is any volcanic activity.

According to the Central Weather Bureau’s SeismologyCenter, over the past 50 years, Mt.Datun saw a magnitude 3 earthquake every one to three years. However, there have only been two magnitude 4 or higher earthquakes. Despite this, local seismologists are not concerned.

KuoKai-wen
CWBSeismologyCenter
I guarantee that Mt.Datun will not experience a volcanic eruption. It is undergoing magma cooling, which has produced some gaps, causing the (earth’s crust) to fall. This magma cooling results in daily stress adjustment.

Hsinchu has also recently experienced seismic activity, leading some to worry northern Taiwan may soon face a geological disaster. The SeismologyCenter says that the Hsinchu and Datun events are unrelated and there is no reason for concern.

陽明山地震

今天凌晨12點31分，台北發生芮氏規模4.0有感地震，有民眾擔心，這是否代表大屯火山的爆發前兆，但氣象局保證，這次地震是火山岩漿冷卻之後，熱漲冷縮導致地層塌陷，並不代表，大屯火山開始活躍起來了。後續還會密切觀察！

監視器畫面，清楚紀錄下，周三凌晨12點31分，台北士林區，26年來，最天搖地動那一刻。

儘管這回地震，芮氏規模只有4.0，但震央罕出現在大屯火山區，造成台北出現4級震度。這也是士林歷年來，規模第三大地震，居民憂心大屯火山，是否又開始活躍起來。

[[台大地質系教授 陳宏宇]]
“這種微地動啊，大概是一般應力釋放裡頭一個比較正面的意義，這個並沒有告訴我們火山有什麼活動的現象”

根據地震中心統計，過去50年來，大屯火山區平均1到3年，就會出現規模3的地震，但芮氏規模4以上地震，之前記錄只有2次，但地震中心主任要大家別擔心。

[[氣象局地震中心主任 郭鎧紋]]
“我在這邊跟大家保證，大屯火山目前完全沒有要噴發的這種跡象，主要是岩漿在冷卻的過程中，會產生一些空隙，(地殼)就稍微往下掉，那其實這樣一個岩漿冷卻過程 應力調整 每天都在進行”

由於日前新竹也曾發生群震，有人認為這是北台灣地質活躍的象徵，地震中心表示，這沒有直接相關，而且新竹地震是板塊推擠，兩者成因不同。