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題 名 | 2013年臺灣地區地震活動回顧=2013 Seismic Activity in Taiwan Area |
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作 者 | 蒲新杰; 甘志文; 邱俊達; 何美儀; 郭鎧紋; 呂佩玲; | 書刊名 | 氣象學報 |
卷 期 | 52:2 2015.10[民104.10] |
頁 次 | 頁43-68 |
分類號 | 351.249232 |
關鍵詞 | 地震活動; 0327南投地震; 0602南投地震; 1031花蓮地震; 0302南山地震; b值; z值; 2013; Seismic activity; 0327 Nantou earthquake; 0602 Nantou earthquake; 1031 Hualien earthquake; 0307 Nanshan earthquake; B value; Z value; |
語 文 | 中文(Chinese) |
中文摘要 | 中央氣象局地震觀測網於 2013年一共偵測到 45,510個地震,地震數量是自 1999年以來,數目最多的一年。幸運的,這些地震多數是規模小於 2的微震活動。此報告將以這些地震資料為基礎,針對強震( ML≥6)活動、特殊地震案例、與地震目錄探討地震特性的空間變化。在強震活動的部分,2013年一共收錄到 4個規模大於 6的強震,其中有三個發生在臺灣島內,各別為 3月 27日與 6月 2日發生在臺灣中部的南投地區與 10月 31日發生在臺灣東部的花蓮地區。南投地區的強震部分,其震源深度分別為 20和 15公里。當地的強震活動,自 1999年的集集地震後,就零星不斷的發生,也包含 2013年的兩個南投強震。震後的餘震活動部分, 0327南投地震之餘震多數集中在震源以西的淺部; 0602南投地震之餘震活動多數集中在震源以南的地區。在臺灣東部地區,1031花蓮地震發生在花蓮市南方,其震源深度在 15公里。餘震活動與震源機制顯示,這次的震源可能是一個向西傾的破裂。與地質構造比對,推測可能與中央山脈斷層構造有關。在特殊的地震活動方面,自 2011年起,宜蘭南山地區開始有許多淺層的地震活動,至 2013年底時仍然不見停止。在這期間,發生的最大規模地震為 ML5.9,時間是 3月 7日。檢視過去的地震資料,這類的地震活動,在 1982年至 1986年時也曾發生。最後,在地震特性的空間變化上,我們將討論地震的 b與 z值。在 b值的部分,發現 2013年的島內地區, b值都相對偏低( b<0.9),尤其是強震和特殊地震序列發生的地區。接著我們再討論地震年活動與背景活動的差異性( z值),發現地震活動增加的部分集中在南投、花蓮以及南山地區;地震活動相對減少的地方則在車籠埔斷層南段、和平海盆地區、與臺灣本島、蘭嶼、綠島間的海域。理論上來說,為了釋放累積的地震能量,地震減少的地區在未來也許有可能會產生一些明顯的地震活動。 |
英文摘要 | In 2013, there were 45,510 local and regional earthquakes located beneath the Taiwan area by the Central Weather Bureau. This number is the largest since1999. Fortunately, most of them are micro-earthquakes with local magnitude smaller than 2. Depending on these earthquakes, this report will discuss the strong earthquakes with local magnitude larger than 6, a particular earthquake case, and the spatial characteristics calculated from the seismic catalog. There were four strong earthquakes, three of them located under the Taiwan island, including the 0327 and 0602 Nantou earthquakes in central Taiwan and 1031 Hualien earthquake in eastern Taiwan. In central Taiwan, the depths of two Nantou earthquakes were 20 and 15 kilometers, respectively. Strong earthquakes in central Taiwan had occurred from time to time since the 1999 Chichi earthquake, including the 0327 and 0602 Nantou earthquakes in 2013. Both Nantou earthquakes have similar source parameters but quite different patterns of aftershocks. The aftershocks of the 0327 Nantou earthquake concentrated in the shallow part to the west of the man shock, while those of the 0602 Nantou earthquake were located in the southern region of the main shock. In eastern Taiwan, the hypocenter of the Hualien earthquake is located to the south of Hualien city with depths of 15 kilometers. According to the seismic distribution and focal mechanism, the rupture plain of the main shock should dip toward west and might be associated with the Central Range fault. In terms of particular case, an earthquake sequence occurred in the upper crust of Nanshan area from 2011 to the end of 2013. During this period, the main shock was determined ML5.9 on March 7. Similar earthquake sequence could be found between 1982 and 1986. As for spatial characteristics calculated from the seismic catalog, the b and z values would be discussed. B values lower than 0.9 appear in most areas of Taiwan, especially for the areas of strong earthquakes and particular earthquake sequence. Comparing the seismic annual activity with background (z value), seismic activity increased Nantou, Hualien and Nanshan areas. These anomaly areas just match the strong earthquakes in Taiwan island and the particular earthquake case. On the other hand, seismic activity decreased in the southern part of Chelungpu fault, the Hoping basin, and the marine area between Taiwan, Lanyu, and Ludao. Theoretically, the areas with decreased seismicity have the potential of major earthquakes to release the cumulative tectonic stress in the future. |
本系統中英文摘要資訊取自各篇刊載內容。