本研究選取範圍為1980年至2016年， dY固定為3年，搜尋0~20公里至0~30公里之極淺層歷史地震事件，找出最強地震圓弧雙交叉進行芮氏規模5.7以上強震預測分析。 本研究發現不論是0~20公里深度或是0~30公里深度的分析中皆呈現出，保留半徑比極小的最強地震圓弧雙凸交叉，或是保留半徑比極大的最強地震圓弧凹凸交叉，皆使短天期的強震預測出現甚高的命中率。 ;The strongest double intersections of circular arcs of earthquakes are searched to predict strong earthquakes with magnitude over 5.7. The events that we study occurred from 1980 to 2016 and the seach period dY is set to be 3 years. Two types of very shallow events with maximum depths equal to 20 km and 30 km are analyzed. It is found that, no matter the maximum depth of the events is 20 km or 30 km, the hit rates of the predictions of the strong earthquake within 70 days by using the strongest double convex intersections of circular arcs of earthquakes with very small radius ratios or by using the strongest concave convex intersections with very large radius ratios are rather high.
