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今狂震56起!能量還在釋放 氣象署:不排除還有規模5以上餘震

ETtoday
2025/01/21 | 2分鐘閱讀

記者李姿慧/台北報導

嘉義大埔鄉今天(21日)凌晨發生芮氏規模6.4地震,至上午11時許已56震。氣象署表示,上午8時後地震活動慢慢趨於平靜,不過嘉義大埔地震屬中大型地震,能量不會透過單一事件釋放,不排除3天內仍有規模5以上餘震發生。

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中央氣象署地震測報中心主任吳健富表示,從1900年以來歷史資料,1964年嘉義白河發生規模6.3地震,而今日這起大埔地震,為白河地震61年後發生規模接近6.4地震,不過該規模為速報結果,重新定位後規模可能會再調整,這是61年該地發生規模類似地震;此外,1941年嘉義中埔曾有規模7.0地震,歷史資料庫半徑30公里內規模5.5以上地震不少,顯示該地的地震活躍、餘震頻繁。

吳健富指出,嘉義大埔地震附近有「口宵里斷層」、「六甲斷層」、「觸口斷層」,地震成因依照目前資料無法歸在哪個斷層,但斷層多顯示地震活躍的趨勢,統計到今天上午9時半,餘震數量偵測到15個顯著有感地震,小區域地震有40個,總共55個地震,讓中南部民眾整夜睡不好覺,而地震分布偏震央南邊,在台南楠西、南化和嘉義大埔等跳來跳去。

由於今天已發生55起地震,吳健富說明,嘉義大埔規模6.4地震發生後,凌晨0時26分台南楠西區規模5地震,以及凌晨1時42分台南南化區規模5.2地震,後續地震數量降下來,規模大多3.3到3.4以上,上午8時後地震數量已經慢慢平靜。

吳健富呼籲,嘉義大埔地震算中大型地震,能量不會透過單一事件釋放,今天凌晨地震為前震機率不高,不排除3天內仍有規模5以上餘震發生,頂多為規模5.5到6的餘震,提醒做好防震準備,台灣為地震活躍區,做好防震準備,保護自身安全。

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