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タイトル: The role of fault continuity at depth in numerical simulations of earthquake rupture
その他のタイトル: 地震破壊数値シミュレーションにおける断層深部連続性の役割 : 特集「地震発生の物理からみた地震発生帯堀削」
著者: Aochi, Hideo
著者(別言語): 青地, 秀雄
キーワード: fault geometry
fault continuity
rupture propagation
発行日: 2003年
出版者: 東京大学地震研究所
掲載誌情報: 地震研究所彙報. 第78号第1冊, 2003, pp. 75-82
抄録: We simulated dynamic rupture propagation along a branched fault, which is partially segmented by a slit. This is an analogy of a strike slip fault, which displays a jog structure on the ground surface but forms a continuous system at depth. We observed that rupture directivity can significantly change due to the existence of the fault slit and that the relative location of the slit to the hypocenter is important. On the other hand, final rupture area and slip distribution are principally controlled by the continuity of the fault at depth. However, if the continuous part of the fault is too narrow, the rupture can be disturbed. If enough stress is accumulated, rupture can still progress through a strong dynamic stress transfer at the bottom of the slit. This infers that it is important to reveal the fault structure at depth and its surroundings in order to discuss rupture size in a complex fault system in the geological meaning.
URI: http://hdl.handle.net/2261/5734
ISSN: 00408972


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