住桃園不用怕地震? 專家告訴你原因 - 桃園
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By Heather
at 2018-02-08T00:24
at 2018-02-08T00:24
Table of Contents
住桃園不用怕地震? 專家告訴你原因
〔記者許倬勛/桃園報導〕台灣位處歐亞板塊與菲律賓板塊交界,地震頻繁,昨晚花蓮地
區11時50分發生芮氏規模6.0強震,截至今天中午已有逾百餘震,網友好奇「究竟居住哪
個縣市最安全」,中央大學地球科學系系主任顏宏元表示,桃園市沒有活動斷層、加上屬
於台地地形,沒有土壤液化問題,不易發生場址效應,是全台灣地震最少的地區。
影響地震的因素主要包括震源、波傳路徑、場址效應。所謂場址效應,主要是震源的地震
震度波傳到地表時,因地表表面層地下介質的軟硬程度,進而影響地震波傳遞至地表,或
是被放大的現象。
顏宏元說,桃園屬於台地地形,地層多由礫石堆積而成,地質堅硬,不易受到場址效應影
響,震波也不容易被放大,加上桃園沒有活動斷層,所以自發性地震較少,過去45年僅有
2次規模4以上的地震,桃園可說是全台地震最少發生的地方。
http://news.ltn.com.tw/news/life/breakingnews/2335784
(自由 2018-02-07)
--
〔記者許倬勛/桃園報導〕台灣位處歐亞板塊與菲律賓板塊交界,地震頻繁,昨晚花蓮地
區11時50分發生芮氏規模6.0強震,截至今天中午已有逾百餘震,網友好奇「究竟居住哪
個縣市最安全」,中央大學地球科學系系主任顏宏元表示,桃園市沒有活動斷層、加上屬
於台地地形,沒有土壤液化問題,不易發生場址效應,是全台灣地震最少的地區。
影響地震的因素主要包括震源、波傳路徑、場址效應。所謂場址效應,主要是震源的地震
震度波傳到地表時,因地表表面層地下介質的軟硬程度,進而影響地震波傳遞至地表,或
是被放大的現象。
顏宏元說,桃園屬於台地地形,地層多由礫石堆積而成,地質堅硬,不易受到場址效應影
響,震波也不容易被放大,加上桃園沒有活動斷層,所以自發性地震較少,過去45年僅有
2次規模4以上的地震,桃園可說是全台地震最少發生的地方。
http://news.ltn.com.tw/news/life/breakingnews/2335784
(自由 2018-02-07)
--
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