英文篇名
The Geotechnical Environment of the Damage Zone in Tainan Caused by the Meinong Earthquake
作者
李德河、吳建宏、蔡百祥、林宏明、清野純史
關鍵字
美濃地震、台南震害區、大地環境
摘要
2016年2月6日凌晨發生芮氏規模6.6之地震,震央在高雄市美濃區,但卻在20多公里外的台南市引發嚴重的震害,包括土壤液化及高樓倒塌、民宅損毀以及橋樑錯位等。由中央氣象局的地震報告可知地震時在台南市的南北各處的震度大都是5級,但發生嚴重液化災情的安南區、北區、中西區及新市區、新化區多位在台南台地的西北方及東北方,而結構物受損的地點則分佈於東區、歸仁區、關廟區、永康區、玉井區等處則是在台南台地的東南部及東方,顯而易見不同種類震害的分佈具有地域性而與台南的大地環境有關。因此,本文乃由台南的海岸線遷移來瞭解台南的地層沈積環境的變化,再由工程鑽探井的資料調查,來分析不同的沈積環境中地層的組成特性及其與震害間的關係。
由於美濃地震引發震害的地點大都位在曾文溪以南,二仁溪以北的範圍內,因此本文的台南震害區大地環境特性的調查亦以此區域為探討對象,期望所得調查結果可作為而後加強地震防災措施時之參考。
英文摘要
On February 6, 2016, an earthquake happened occurred with ML6.6 in south Taiwan. The epicenter of the earthquake was located in Kaohsiung, but the earthquake caused severe damage 20 km away in Tainan city, including soil liquefaction, the collapse of a high rise building, damage to residential houses, and the displacement of bridges. Reports of the Central Weather Bureau, Taiwan, show that Tainan City reached seismic intensity level V. Moreover, the soil liquefactions occurred in the northwest and northeast parts of the Tainan tableland, in the An-nan District, North District, and West Central District, and Sinshih District. Structures were damaged in the south and the southeast parts of the Tainan tableland, in the East District, Gueiren District, Guanmiao District, and Yujing District. Geotechnical environment may be a key factor to investigating the distribution of the disasters. This paper discusses the changes of sedimentary environment from the movement of the coast in Tainan. Then, the impact of the geotechnical properties in different sedimentary environments are examined to investigate the damage distributions by the borehole data.
The discussed zone, with major seismic damages, is between the Erren River in the south and Tsengwen River to the north. The paper serve as a reference to increase the seismic resistance of Tainan city.