Seismic evidence for volcanic activity discovered in central Arctic
Seismic evidence for volcanic activity discovered in central Arctic
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北极中部发现火山活动的地震证据
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
W. Jokat
中科院分区：
文献类型：
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作者：
C. Müller;W. Jokat
最近在北冰洋中部的加克尔海岭沿着发现了一个由200多个地震事件组成的地震群。该虫群发生于1999年1月至8月之间，位于东经70°至90°之间（图1a）。在过去的几十年里，沿着沿着1800公里长的山脊只检测到了几次随机聚集的地震。
从矩张量解的证据表明，这个群起源于构造裂谷插曲，双力偶正断层，并在1999年3月初过渡到更多的火山起源与强烈的非双力偶事件。这是北极高地近期火山活动的第一个直接证据。由于地震活动在缓慢和超缓慢扩张的海脊处较低，因此震群为研究沿着海脊的地壳过程提供了前所未有的机会。
An earthquake swarm of well over 200 events was recently detected along the Gakkel Ridge in the central Arctic Ocean. The swarm occurred between January and August of 1999 and was localized between longitudes 70°E and 90°E (Figure 1a ) . Over the past few decades, only a few randomly clustered earthquakes had been detected along the 1800-km-long ridge.
Evidence from moment tensor solutions indicates that this swarm originated as a tectonic rifting episode, with double-couple normal faulting, and transitioned in early March of 1999 to more volcanic origin with strongly non-double-couple events. This is the first direct evidence of recent volcanic activity in the high Arctic. Because seismic activity is low at slow and ultra-slow spreading ridges, the swarm provides an unprecedented opportunity to investigate crustal processes along the ridge.