1999年台灣發生921集集大地震，安朔葉教授人在巴黎心繫台灣，尤其是在新聞上看到相關訊息的報導，台灣遭到百年來最大最嚴重的地震災害。身為地質學家，地震及斷層正是安教授的研究項目。他排除萬難，包括學校的教課及學務等，在第一時間來到台灣。他心想著在此救災第一的時刻，他能貢獻最多的應該是了解地震災害特性，特別是地表斷層破裂特徵，期待這樣的科學研究，能為台灣甚至人類有所幫助，對地震的防治能發揮科學知識的功能。因此在約十天的時間，安教授沿著車籠埔斷層，從北到南，逐地逐點仔細觀察地表斷層的特性，做詳細的紀錄及分析。

1999, the catastrophic Chi-Chi earthquake struck Taiwan causing the greatest loss of human lives and damage to properties in the last hundred years. At that time, although Professor Angelier was in Paris, he was so concerned with theTaiwanese that he immediately dropped his teaching and administrative duties and hurried to Taiwan to do field investigations. As a geologist, he realized that the most important scientific contribution to the mitigation of earthquake damage is the understanding of the characteristics of the co-seismic surface rupture. He has high expectations that this kind of scientific research could be helpful to the Taiwanese people and eventually to the world. Thus, in approximately ten days, Professor Angelier succeeded in following the fault traces of the Chelungpu fault from north to south and putting down in detail the careful investigation and analysis of the characteristics of the surface ruptures.

石崗壩（1999）

石崗壩位於大甲溪石崗鎮，在集集地震時被車籠埔斷層錯位，垂直位移達5-8公尺，造成壩體明顯錯移。

Shi-Kang Dam (1999)

The Shi-Kang Dam is situated at the Shi-Kang town, Tachia River. The dam structure was offset by the Chelungpu fault during Chi-Chi earthquake with 5-8 meters of vertical displacement exhibiting a pronounced rupture.

光復國中運動場，霧峰（1999）

霧峰的光復國中也是位在車籠埔斷層線上。集集地震斷層錯動在運動場上產生了一個斜跨跑道的崖坡，高約1-2公尺。這個地點被保留，並且在原地興建了地震博物館。在地震後的勘察中，安教授在這個運動場上思考很久，很仔細的量測跑道被斷層錯位的形貌。並從兩端跑道的重建，計算了地震的三度空間位移向量。

Track and Field, Kuang-Fu School (1999)

The Kuang-Fu School, Wu-Feng lies on the fault trace of the Chelungpu fault. The co-seismic ruptures displaced the track and field stadium with a fault scarp of about 2 meters in height. This site has been preserved and an earthquake museum was built on top of the track and field stadium. Professor Angelier had deliberated at length at this stadium and did detailed measurements on the fault scarp. At the two ends of the field track, he reconstructed and calculated the vector of fault displacement in 3 dimensions.

斷層崖抬升擠壓，豐原（1999）

這個地點的原始觀察形貌如左上圖，斷層上盤抬升逆衝，使右側房屋整個傾斜向左，而原先停在兩棟房子間的小車，則被擠靠碰上左側房屋。藉由野外實地幾何距離的量測（左中及左下圖），安教授即把地震變形前的相貌重建出來（比較右側上圖及下圖），並計算得到斷層在此地點造成的垂直位移為3.44公尺。

Fault scarp deformation, Fengyuan (1999)

Professor Angelier made detailed observations along the fault ruptures zone of the Chi-Chi earthquake. At the some sites, the deformed human construction, for instance like this tilted house and displaced car, allow him to reconstruct the original geometry and to calculate the fault movement – here a horizontal shortening of 3.44 m.