Evidence of explosive seafloor volcanic activity from the Walvis Ridge, South Atlantic Ocean
Evidence of explosive seafloor volcanic activity from the Walvis Ridge, South Atlantic Ocean
复制标题
南大西洋鲸湾海脊海底火山爆发活动的证据
DOI：
10.1029/2005gl023205
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发表时间：
2005
影响因子：
5.2
通讯作者：
R. Dziak
中科院分区：
文献类型：
--
作者：
J. Haxel;R. Dziak
停泊在北大西洋的水听器记录了一系列起源于南大西洋沃尔维斯海岭的爆炸性火山声信号。从2001年11月24日开始，一直到2002年3月，在沃尔维斯海岭发现了365个爆炸信号。最大的蜂群于12月19日格林尼治标准时间2329开始，持续了1.25小时，产生了32个可定位的事件。群的位置集中在一座未命名海山的北方侧翼（南纬−32.96°;西经−5.22°），位于威斯特海山西北。这些信号被解释为火山爆发，因为与2001年加勒比海一次确认的海底喷发（Kick'em Jenny火山）记录的声学信号相似。所提出的观测结果表明，沃尔维斯海脊最近的岩浆活动可能与特里斯坦-库尼亚地幔柱无关。此外，这些事件为伸展断裂带模型提供了支持，该模型导致火山活动沿着大规模海底线性构造的较旧部分复发。
Hydrophones moored in the North Atlantic Ocean recorded a sequence of explosive, volcano‐acoustic signals originated at the Walvis Ridge in the South Atlantic Ocean. 365 explosive signals were detected from the Walvis Ridge beginning 24 November 2001 continuing through March 2002. The largest swarm began on 19 December at 2329 GMT, and lasted 1.25 hrs producing 32 locatable events. Swarm locations are centered on the northern flank of an unnamed seamount (−32.96°S; −5.22°W), northwest of Wüst Seamount. These signals are interpreted as volcanogenic explosions due to similarities with acoustic signals recorded from a confirmed submarine eruption in the Caribbean in 2001 (Kick'em Jenny volcano). The observations presented suggest recent magmatic activity along the Walvis Ridge may be unrelated to the Tristan da Cunha mantle plume. Furthermore, these events lend support for an extensional fracture‐zone model resulting in the recurrence of volcanic activity along older segments of large‐scale sea floor lineaments.