Active faulting induced by slip partitioning in Montserrat and link with volcanic activity: New insights from the 2009 GWADASEIS marine cruise data
Active faulting induced by slip partitioning in Montserrat and link with volcanic activity: New insights from the 2009 GWADASEIS marine cruise data
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蒙特塞拉特滑移分区引起的活动断层与火山活动的联系：来自 2009 年 GWADASEIS 海洋巡航数据的新见解
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
V. Clément
中科院分区：
文献类型：
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作者：
N. Feuillet;F. Leclerc;P. Tapponnier;F. Beauducel;G. Boudon;A. Le Friant;C. Deplus;J. Lebrun;A. Nercessian;J. Saurel;V. Clément
R/V Le Suroît 上获取的新高分辨率海洋数据用于更详细地绘制蒙特塞拉特近海活动正断层图。蒙特塞拉特-哈弗斯断层带的主要断层累积陡坡高达200米，使沉积层偏移数百米。它们排列成右步进、梯形、反张力阵列，这证实它们容纳了由于沿火山弧倾斜会聚的滑移分区而产生的运动的左侧分量。他们穿过蒙特塞拉特岛最近的火山群。断层和裂隙控制了安山岩穹丘的位置，这些穹丘沿着 N110°E 平均断层走向排列。穿过岛屿的约 10 公里长的断层段可能会产生破坏性的 M 约 6 级事件，与 1985 年 3 月 16 日发生的 Mw∼6.3 浅层地震相当，该地震使雷东达附近 N140°E 的海底左旋断层破裂。
New high‐resolution marine data acquired aboard R/V Le Suroît was used to map active normal faults offshore Montserrat in greater detail. The main faults of the Montserrat‐Havers fault zone have cumulative scarps up to 200 m high, and offset sedimentary layers by hundreds of meters. They are arranged in a right‐stepping, en echelon, trans‐tensional array, which confirms that they accommodate the left‐lateral component of motion resulting from slip partitioning of oblique convergence along the volcanic arc. They cut across Montserrat's recent volcanic complex. Faulting and fissuring exerted control on the position of andesitic domes, which are aligned along the N110°E average fault trend. The ≈10 km‐long fault segments that cross the island could produce damaging, M ≈ 6 events comparable to the shallow, 16 March 1985, Mw∼6.3 earthquake that ruptured a submarine, N140°E striking, left‐lateral fault near Redonda.