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題 名 | 1941年中埔地震重定位的研究=A Study on the 1941 Chungpu Earthquake Relocation, Taiwan |
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作 者 | 鄭世楠; 黃歆宜; 黃歆宜; | 書刊名 | 健行學報 |
卷 期 | 36:2 2016.04[民105.04] |
頁 次 | 頁29-42 |
分類號 | 351.2492 |
關鍵詞 | 1941年中埔地震; 重定位; 斷層面解; 近震規模; 震矩規模; The 1941 Chungpu earthquake; Relocation; Fault-plane solution; Local magnitude; Moment magnitude; |
語 文 | 中文(Chinese) |
中文摘要 | 本文應用格點搜尋法進行1941 年中埔地震及其餘震重定位的工作,藉由S-P時間殘差均方根的最小值,推估中埔地震的震央位於23.375°N, 120.475°E,震源深度為9 公里。由最大振幅推估近震規模(ML)為7.0,震矩規模(MW)為7.3,此數值與表面波規模(MS)推估的結果一致。地震震源區約呈N20°E 走向分布,範圍在長約60 公里,寬約30 公里的水平面上,與主要災害地區的分佈相當一致。雖然1941 年中埔地震後在地表上未發現地震斷層的跡象,但由地震斷層面解與餘震分布的結果顯示,主震伴隨地底下逆斷層錯動,斷層的走向、傾角、滑移角分別為N20°E、55-60 度與85-110 度,隨後引發另一個略呈平行且較深的逆斷層錯動。最大壓應力軸呈現290-297 度幾近水平,與該地區大地應力分布一致,反應菲律賓海板塊西北向碰撞歐亞大陸板塊的現象。 |
英文摘要 | In this study, the Grid Search methods are used to relocate the 1941 Chungpu earthquake and its aftershocks. From calculating the minimum residual RMS of S-P times, the estimated epicenter is at 23.375°N, 120.475°E, and the focal depth is 9 km. By measuring the maximum amplitude, the quake had an estimated local magnitude (M_L) of 7.0 and a moment magnitude (M_W) of 7.3 which are in agreement with the surface wave magnitude (M_S). The source area had a direction in about N20°E with a size of about 60-km × 30-km, consistent with the distribution disaster areas. Although the surface rupture trace was not found in the 1941 Chungpu earthquake, the results of fault-plane solutions and aftershocks distribution indicate that the main shock induced a blind reverse fault dislocation, a plane with strike N20 °E, dip 55-60°, and rake 85-110° respectively, and triggered another reverse fault movement which is deeper and nearly parallel to the dip of the mainshock’s fault plane. The direction of the maximum compressive stress is about 290-297 degrees, almost horizontal. This agrees with the distribution of tectonic stress, corresponding with the fact that the Philippine Sea plate is moving in a northwestward direction relative to the Eurasian Plate. |
本系統中英文摘要資訊取自各篇刊載內容。