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    题名: 對愛琴海南部聖托里尼阿莫爾戈斯地區地震活動及其對火山構造的影響調查;An Investigation into the Seismicity of the Santorini-Amorgos Zone, Southern Aegean and Its Implications for Volcano-Tectonics
    作者: 柯士達
    贡献者: 國立中央大學地球科學學系
    关键词: 愛琴海;聖托里尼島;希臘;火山;地震位置;地震矩張量;Aegean;Santorini;Greece;volcano;earthquake location;moment tensor
    日期: 2020-01-13
    上传时间: 2020-01-13 14:23:19 (UTC+8)
    出版者: 科技部
    摘要: 愛琴海南部的火山弧為愛琴海微孔板下非洲岩石圈以0.9公分/年的速度擠壓而形成的。聖托里尼 - 阿莫爾戈斯地區的一端是聖托里尼火山口,另一端是阿莫爾戈斯島,1956年發生了強烈地震(Mw~7.6)。在這兩個地質特徵之間,有幾個海底火山被映射到海底。可能處於休眠狀態。此計畫旨在利用永久地震網絡(希臘統一地震網絡,HUSN)和兩年前部署在愛琴海南部的兩個臨時網絡(CYCNET,EGELADOS)記錄的數據,研究該地區地震的地震活動性和地震源性質。由於數據量大,處理將從自動選擇階段開始,然後在必要時進行手動選擇。將使用概率非線性算法NLLOC獲得絕對位置,以便利用已發布的最小1D速度模型來正確地估計水平和垂直不確定性。通過使用雙差算法並利用目錄和波形互相關差分傳播時間來計算精確的相對位置。最後,通過反轉全波形,計算幅度大於3.5的事件的力矩張量,而對於較小的事件,將優選反轉極性和幅度比的方法。這項調查的結果將能夠確定哪些地震是由構造/火山活動引起的,哪些斷層/海底火山表現出地震活動以及是否存在包含大偏角或各向同性成分的地震源。 ;The volcanic arc in the southern Aegean formed as the result of the subduction of the Africanlithosphere beneath the Aegean microplate at a rate of 0.9 cm/yr. The Santorini-Amorgos zoneencompasses at its one end the Santorini caldera and at its other end the island of Amorgos where a strong earthquake (Mw ~7.6) occurred in 1956. In between these two geological features several submarine volcanoes have been mapped on the seafloor possibly being in a state of dormancy. This proposal aims at investigating the seismicity distribution and source properties of earthquakes in this area using data recorded by the permanent seismic network (Hellenic Unified Seismic Network, HUSN) and two temporary networks (CYCNET, EGELADOS) that were deployed in the southern Aegean for a period of two years. Due to the large amount of data the processing will begin with automatic picking of phases followed by manual picking whenever necessary. Absolute locations will be obtained using the probabilistic nonlinear algorithm NLLOC in order to properly estimate horizontal and vertical uncertainties utilizing already published minimum 1D velocity models. Precise relative locations will be computed by using the double-difference algorithm and by utilizing both catalog and waveform cross-correlation differential travel times. Finally, moment tensors will be calculated for events with magnitudes larger than 3.5 by inverting full waveforms while for smaller events an approach of inverting polarities and amplitude ratios will be preferred. Results of this investigation will be able to determine which earthquakes are caused by tectonic/volcanic activity, which faults/submarine volcanoes exhibit seismic activity and whether there are seismic sources that include large deviatoric or isotropic components.
    關聯: 財團法人國家實驗研究院科技政策研究與資訊中心
    显示于类别:[地球科學學系] 研究計畫

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