大地震後應力轉移與其餘震關係之探討; Stress Transfer after Large Earthquake in Association to Aftershocks

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Title:	大地震後應力轉移與其餘震關係之探討;Stress Transfer after Large Earthquake in Association to Aftershocks
Authors:	馬國鳳
Contributors:	地球物理研究所
Keywords:	應力轉移;大地震;餘震;stress transfer;large earthquake;aftershocks;地球科學類
Date:	2004-12-01
Issue Date:	2010-11-30 15:43:45 (UTC+8)
Publisher:	交通部中央氣象局
Abstract:	由應力轉移的研究中發現，大地震間的發生有可能是相關的，他們彼此間互相聯繫傳遞，尤其地震發生時應力的轉移將可能導致其他區域加重應力的聚集而釋放能量，造成另一地震。造成此大地震的原因，除了本身板塊運動的推擠造成應力累積而釋放能量形成地震之外，由另一地震發生後轉移過程的應力亦會加速或降低另一地區產生地震的機率。在此，我們以九二一地震斷層面上的錯動量分佈，分析其隨不同深度所造成的庫倫應力變化，探討其與各相關深度的餘震在一個月後在嘉義地區發生兩個規模六的以上地震的關係。藉此了解，大型餘震的位置是否可能為可預測的。在中央氣象局一分鐘地震定位的前提下，快速得出斷層沿線的錯動量分布，進而得出其伴隨的庫倫應力變化，我們可以針對大型餘震發生的可能位置作評估，以降低在大地震後，另一大型餘震再加諸的災害。 It is possible that there are relations between the related earthquakes from the study of stress transfer. They transmit messages to each other and to aggregate and release energy by stress transfer, especially when one earthquake may cause another one. The causes of a big earthquake are that the stress transfer by one earthquake will also accelerate or reduce the probability to induce earthquake in other regions, in addition to the stress accumulation by extruding of plate and then release energy. Therefore, we analyze the Coulomb stress transfer at different depths by slip distribution on fault plane of 921 earthquake and investigate the relationship between aftershocks at different depths of two earthquakes whose magnitudes are larger than 6 happened in Chia-Yi region after 921 earthquake for a month to comprehend whether the location of larger aftershocks are predictable or not. Under the premise that the earthquake location could be determined in one minute by Central Weather Bureau, we can estimate the possible locations where the large aftershocks may happen and obtain the slip distribution along the fault, and then acquire the variation of the accompanying Coulomb stress transfer. Finally, we can estimate the possible location of large aftershocks to reduce the damages from other large aftershocks after the main earthquake. 研究期間：9301 ~ 9312
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Graduate Institute of Geophysics] Research Project

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