台灣東部的地殼結構是了解菲律賓海與歐亞板塊從俯衝到碰撞的構造演化和相互作用的關鍵。為了詳細探索該地區的地殼結構，環境噪聲層析成像與密集的地震陣列數據集一起使用。 2019年，我們在台灣東南部部署了40個臨時地震台站，為期約1個月。時間序列互相關以構建瑞利波格林函數。對於每個站對，使用頻率時間分析和圖像轉換技術挑選群速度色散曲線。然後，我們在 1-10 秒時獲得表面波色散。
基於對射線路徑圖的分析，結果與高頻（1-5 秒）群速度的地表地質高度相關。相對較高的群速度主要分佈在由變質岩組成的中央山脈。相對較低的群速度分佈在由沉積物組成的縱谷。在以沉積物和安山岩為主的海岸山脈，射線路徑具有一定的速度範圍，這對應於與其他地區相比岩石分佈相對變化。該研究提供了台灣東南部高頻頻散曲線（1-10s）的基礎數據集，為未來在整個台灣東部建立精細的速度淺層結構提供了基礎數據。

Crustal structure in eastern Taiwan is key for understanding the tectonic evolution and interaction between the Philippine Sea and Eurasian plates from subduction to collision. In order to explore the crustal structure in this region in detail, ambient noise tomography was used with a dense seismic array data set. We deployed 40 temporary seismic stations in Southeastern Taiwan in 2019 for about one month. Time series were cross-correlated to construct Rayleigh wave Green’s functions. For each station pair, group velocity dispersion curves were picked using a frequency-time analysis and image transformation technique. Then, we obtain surface-wave dispersions at 1–10 sec.
Based on analyzing the maps of the ray paths, the results are highly correlated with surface geology for high frequency (1-5 sec) group velocities. The relatively high group velocities are mostly distributed in the Central Range, which is composed of metamorphic rocks. The relatively low group velocities are distributed in the Longitudinal Valley which is composed of sediments. In the Coastal Range mainly composed of sediments and andesite, the ray paths are with a range of velocities, which corresponding to the relatively varying rock distribution comparing with other regions. This study provides a fundamental data set of high-frequency dispersion curves (1-10s) in Southeastern Taiwan for establishing a fine velocity shallow structure in the whole of eastern Taiwan in the future.

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