台南台地位於台南市區，為一東陡西緩的橢圓形台地。目前台地的形成機制仍存在許多爭議，而過往的文獻主要偏重於台地東緣，有關台地西緣的研究相對較少。為瞭解台地西緣之地下構造，本研究沿台地西側由北至南架設了4條東西向的微地動觀測測線（長1500~3000公尺不等），其中，最北端的測線位於永康區並橫跨鹽水溪，最南端則位於南區省躬國小附近。每條測線以至少8個微地動測量點組成，測站密度為約每250公尺一個站。單站頻譜比法的分析結果顯示，橫跨台地西緣測線A、B及C之共振主頻（介於1.1~1.7 Hz）的變化不大，而同一測線中，放大倍率的變化較為明顯，由台地邊緣西側向東側逐漸增加（由1.2改變至3.7），且在地形高程5至15公尺的區域間，放大倍率變化最明顯。為進一步探討在此台地西緣的變化原因，本研究利用OpenHVSR反演測線的淺層速度構造，反演結果顯示位於台地上的測站其深度300公尺處，S波速度由500 m/s迅速增加到1000 m/s，該劇烈變化顯示此處可能為沖積層與基岩的交界面，此深度介面可對應至深鑽結果之上部古亭坑層位置（375公尺）；另根據跨越台地的三條測線A、B及C反演所得之二維速度構造剖面顯示，上部古亭坑層與台南層的介面深度從台地西側平原的地下800公尺深，往東500至600公尺距離內快速抬升至地下300公尺深，並在台南台地上趨於平緩，此一傾斜地層變化結果與Le Béon 等人（2019）提出的台南地表淺層構造趨勢相符。由此可知沖積層與基岩的地層介面S波速度劇烈變化及地表地層厚度的快速變化是導致台地邊緣處所觀察到之放大倍率變化的主要原因。

Tainan Tableland is an oval-shaped tableland located in Tainan city. It is characterized by steep terrain on the eastern edge and gentle slope on the western edge. The mechanism of its formation is still under debate. Previous studies were mainly focus on the eastern edge of Tainan Tableland, nevertheless, the research of the western tableland is few. To understand the structure of subsurface of the western tableland, we employed four east-west microtremor survey lines from north to south. The length of survey lines ranged from 1500 to 3000 meters. The northernmost survey line located across YongKang District and Yanshui River, while the southernmost line was nearby the Shenggong Elementary school in the South District. Each survey line was composed of at least eight microtremor measurements with a density of 250 meters per site. The HVSR results showed that the resonant frequency peak of the survey lines A, B, and C concentrated on the frequencies ranged from 1.1 Hz to 1.7 Hz. However, for the same survey lines, the amplifications of HVSR were various. The amplitudes smoothly increasing from 1.2 to 3.7 from west to east. It showed the most significant change on elevation ranged from 5 meters to 15 meters. To understand the reason behind the variations, we utilized OpenHVSR to invert velocity structures of shallow surface. The result of the inversion showed the speed of the S wave reached 1000 m/s at depth 300 meters. This depth corresponds to the upper Gutingkeng Formation (375m) according to the borehole result. Our research showed the depth of the interface between upper Gutingkeng Formation and Tainan Formation is 800 meters on the western edge of the tableland, moreover, it rapidly steepen toward the eastern side with the profile of 300 meters in depth, and comes to a subdued relief on Tainan Tableland. This result is agree with previous studies. Therefore, the changes of amplification is related to the rapid variation of the S-wave velocity between the subsurface layer and the basement rock formation.

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