本研究是將李顯智教授於論文[3]中提出的「最強地震弧交叉」的概念，利用於美國地區，以試驗本方法是否適用於美國地區，並進一步改進方法。
以美國地質調查局(USGS)之資料作為地震目錄，規模從大到小向下篩選，擷取首先出現的有效地震圓弧交叉，即為最強地震圓弧交叉，並用此交叉對後續發生之強震做統計及比較，尋找兩者之間的關聯性，作為未來強震預測之參考。
本篇資料選定阿拉斯加與加州地區為研究對象，時間為1995上半年至2004下半年，以半年為時間步幅，找出最強地震圓弧交叉，阿拉斯加地區有效交叉共15個，加州地區則有9個，再以規模5.7、6.0與預測範圍半徑70公里、Lmin/4、Lmin/3，製作統計圖對比大地震的後續事件趨勢，並進一步探討雙交叉的影響，最後接續林致彣同學之論文[10]，對比結果。
阿拉斯加地區和加州地區雖與台灣同屬環太平洋地震帶，阿拉斯加下方的阿留申群島是屬於擠壓火山帶和隱沒帶與台灣相同，而加州地區則為聖安地列斯斷層橫跨南北的錯動性板塊，本研究將探討最強地震圓弧交叉應用於此兩地區和在台灣地區的應用，有哪些相同和不同之處。

This study is based on the concept of "the strongest intersection of circular arcs of earthquakes" proposed by Professor Hin-Chi Lei in the paper [3]. We apply this concept in the United States to test whether the method is applicable to the United States and try to improve the method.
Using the data of the US Geological Survey (USGS) as the catalog of earthquakes, the magnitudes of events are filtered from large to small. When the first appeared arc intersection is obtained, we call it the strongest intersection of circular arcs of earthquakes, and the intersection is used to predict strong earthquakes. We perform the statistics and comparisons to find the correlation between the two as a reference for future strong earthquake prediction.
This research selects Alaska and California as the research areas. The time is from the first half of 1995 to the second half of 2004. The time interval is half a year to find the strongest intersection. There are 15 effective intersections in Alaska and 9 in California. Then, with the scale of 5.7, 6.0 and the predicted region with radius of 70 km, Lmin/4, Lmin/3, we make statistical charts to compare the follow-up trend of the large earthquake, and further explore the impact of the double intersection, and finally compare the result with the thesis of Jhih-Wun Lin [10].
Although the Alaska region and the California region belong to the Pacific Rim seismic zone, the Aleutian Islands under Alaska belongs to the same squeezing volcanic zone and the cryptic zone, while the California area is the staggered plate across the north and south of the San Andreas fault. This study will explore the application of the strongest intersections of circular arcs of earthquakes in these two regions, and try to find out what are the same and different between them.

[ 1 ] H.C.Lei and C.W.Tang, “Circular Arcs and Curvilinear Distributions of Events of Earthquakes in Taiwan”,The Thirteenth National Conference on structural Engineering / The Third National Conference on Earthquake Engineering, Taoyuan,Taiwan,ROC,2016
[ 2 ] H.C. Lei, “Circles, Circular Arcs and Lines of Earthquakes Around Taiwan”,The 40th National Conference on Theoretical and Applied Mechanics,
Hsinchu, Taiwan, ROC, November 25-26, 2016.
[ 3 ] H.C. Lei, “Some Ideas For Constructing Significant Intersections Of Circular Arcs Of Earthquakes”, 2017 Taiwan-Japan Joint Symposium on the Advancement of Urban Earthquake Hazard Mitigation Technology
[ 4 ] H.C. Lei, “Circles, Circular Arcs and Lines of Earthquakes Around Taiwan
(II): Magnitude and Time”, 2017 the 15th Conference on Land Studies,
Tainan, Taiwan, ROC, May 12, 2017.
[ 5 ] H.C. Lei, W.Y. Tsai, C.P. Yu, Y.C. Shih, P.Y. Sun, Y.Y. Chen, M.H. Chen“An Elementary Evaluation Of Effi ciency Of A Method Of Earthquake Prediction By Intersections Of Circular Arcs Of Earthquakes Around Taiwan”, 2017 Taiwan-Japan Joint Symposium on the Advancement of Urban Earthquake Hazard Mitigation Technology
[ 6 ] 游敬枰，「從2003到2013年台區域地震圓弧交叉與大地震之關聯」，國立中央大學，碩士論文，民國106年6月。
[ 7 ] 中央氣象局 : http://www.cwb.gov.tw/
[ 8 ] 美國地質調查局 : https://www.usgs.gov/
[ 9 ] 李錫堤，台灣區學校校舍耐震性能改善研討會分區講習共同資料 , l999年1月
[ 10 ] 林致彣，「阿拉斯加與加州地區地震圓弧與地震曲線之研究2005年~2014年」，國立中央大學，碩士論文，民國108年6月。
[ 11 ] H.C.Lei, “Strongest Double Intersections of Circular Arcs of Earthquakes around Taiwan”,The 23rd Forum on Land Use and Planning, Tainan, Taiwan, ROC, 2019
[ 12 ] H.C.Lei : ASICAE by HinChi Lei to find the strongest intersections of circular arcs of earthquakes, 2019年2月26日, https://youtu.be/tvgYLpoH9T4