利用2001-2002及2007年的內政部精密水準測量觀測資料，以分析宜蘭地區之地殼變形。研究顯示：1.水準測線相對水準原點K999 之年變化率，大禹嶺-太魯閣測線介於9.3mm/yr至66.3mm/yr之間，結果呈現抬升，顯示年變化率，由東向西增加，與地形起伏成正相關。2. 蘇澳-太魯閣測線，介於-15.4mm/yr至14.4mm/yr之間，結果大致呈現抬升，顯示年變化率，由北向南增加。3. 臺北-二城測線，顯示年變化率介於-2.7mm/yr至8.9mm/yr之間，大致呈現抬升，顯示年變化率，由東向西增加，與地形起伏成正相關。4. 基隆-頭城測線，介於-5.6mm/yr至-0.06mm/yr之間，呈現下降，顯示年變化率，由北向南增加。5. 頭城-蘇澳測線，介於-17.5mm/yr至2.8mm/yr之間，二城-蘇澳測線，介於-11.4mm/yr至2.7mm/yr之間，大致呈現下降，顯示年變化率，由南北兩側向中間增加。6. 棲蘭-公館測線，介於-12.3mm/yr至10.5mm/yr之間，牛鬥-利澤簡測線，介於-13.3mm/yr至7.3mm/yr之間，大致呈現東降西升，顯示年變化率，由東向西增加，與地形起伏成正相關。
研究顯示水準的變形機制取決於地理位置，接近花蓮外海的控制機制為板塊碰撞呈現抬升；接近宜蘭外海的控制機制為弧後伸張呈現下降，宜蘭平原正好位於過渡地帶，接近宜蘭外海受弧後伸張呈現下降，遠離宜蘭外海受板塊碰撞呈現抬升。我們也可以發現研究區域的山麓地帶呈現抬升，顯示碰撞作用仍持續進行。

We use precise leveling observations conducted by the Ministry of Interior in 2001-2002 and 2007 to investigate the crustal deformation of the Ilan region. Our results show that: 1.For the vertical velocity relative to the Keelung Leveling Origin K999, the leveling lines from Dayu Mountain to Tailuge indicates the vertical rate of 9.3 ~ 66.3 mm/yr. The results show uplift. The vertical rate increases from the east to the west; it shows the closer relationship between vertical rate and topography. 2.The leveling lines from Su’ao to Tailuge indicates the vertical rate of -15.4 ~ 14.4 mm/yr. The results roughly show uplift, the vertical rate increases from the north to the south. 3.The leveling lines from Taipei to Ercheng indicates the vertical rate of -2.7 ~ 8.9 mm/yr. The results roughly show uplift. The vertical rate increases from the east to the west; it shows the closer relationship between vertical rate and topography. 4.The leveling lines from Keelung to Toucheng indicates the vertical rate of -5.6 ~ -0.06 mm/yr. The results show descent, the vertical rate increases from the north to the south. 5.The leveling lines from Toucheng to Su’ao indicates the vertical rate of -17.5 ~ 2.8 mm/yr. The leveling lines from Ercheng to Su’ao indicates the vertical rate of -11.4 ~ 2.7 mm/yr. The results roughly show descent, the vertical rate increases from the north and south sides to the middle. 6.The leveling lines from Qilan to Gongguan indicates the vertical rate of -12.3 ~10.5 mm/yr. The leveling lines from Niudou to Lizejian indicates the vertical rate of -13.3 ~7.3 mm/yr. The results roughly show east descent with west uplift. The vertical rate increases from the east to the west; it shows the closer relationship between vertical rate and topography.
We found that the level of deformation mechanisms depend on geographic location. The controling mechanisms show uplift by plate convergence while close to Hualien offshore. The controling mechanisms show descent by back-arc extension while close to Ilan offshore. Ilan plain is just in the transition zone. It shows descent by back-arc extension while close to Ilan offshore. It shows uplift by plate convergence while away from Ilan offshore. We also found that Foothills of the study area show uplift, it shows still in the collision process.

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