Strike-slip faulting during the 2014 Baroarbunga-Holuhraun dike intrusion, central Iceland
Strike-slip faulting during the 2014 Baroarbunga-Holuhraun dike intrusion, central Iceland
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DOI：
10.1002/2015gl067423
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发表时间：
2016-02-28
影响因子：
5.2
通讯作者：
Soosalu, Heidi
中科院分区：
文献类型：
--
作者：
Agustsdottir, Thorbjoerg;Woods, Jennifer;Soosalu, Heidi
在 13 天的时间里，岩浆从冰岛北部裂谷区的冰下 Baroarbunga 火山横向传播。在 2014 年 8 月 29 日爆发之前，它沿着 48 公里的路径在 5-7 公里深度处引发了超过 30,000 次地震。追踪堤坝传播的地震活动以 0.3-4.7 公里/小时的速度短时爆发，间隔长达 81 小时。每次向前涌动时，堤尖后面的地震活动都会下降。来自前缘的力矩张量解仅显示出与前进的岩墙尖端近平行的左旋走滑断层，释放了裂谷带脆性层中累积的应变不足。在前缘后面，观察到左旋和右旋走滑地震。没有发生非双力偶地震意味着堤坝开口是抗震的。
Over a 13 day period magma propagated laterally from the subglacial Baroarbunga volcano in the northern rift zone, Iceland. It created > 30,000 earthquakes at 5-7 km depth along a 48 km path before erupting on 29 August 2014. The seismicity, which tracked the dike propagation, advanced in short bursts at 0.3-4.7 km/h separated by pauses of up to 81 h. During each surge forward, seismicity behind the dike tip dropped. Moment tensor solutions from the leading edge show exclusively left-lateral strike-slip faulting subparallel to the advancing dike tip, releasing accumulated strain deficit in the brittle layer of the rift zone. Behind the leading edge, both left-and right-lateral strike-slip earthquakes are observed. The lack of non-double-couple earthquakes implies that the dike opening was aseismic.