Ring Fault Slip Reversal at Bárðarbunga Volcano, Iceland: Seismicity During Caldera Collapse and Re-Inflation 2014-2018
Ring Fault Slip Reversal at Bárðarbunga Volcano, Iceland: Seismicity During Caldera Collapse and Re-Inflation 2014-2018
复制标题
冰岛 Báråarbunga 火山环断层滑动逆转：2014-2018 年火山口崩塌和再膨胀期间的地震活动
DOI：
10.1029/2021gl097613
复制
发表时间：
2022
影响因子：
5.2
通讯作者：
Glastonbury-Southern E
中科院分区：
文献类型：
--
作者：
Glastonbury-Southern E
微震揭示了Bárarbunga火山口环形断层的运动学;在2014-2015年的裂谷事件和火山口逐渐坍塌期间，以及随后的持续再膨胀。在再膨胀过程中受到严格约束的焦点机制已经从破火山口坍塌期间的事件中反转了相位到达极性。因此，急剧倾斜的北方破火山口断层（平均81 ± 8°）的内侧在喷发后一直向上移动。精确的相对位移的地震活动性和断层面的解决方案证实，这是由于同一环断层结构上的滑动反转。
Microearthquakes reveal the kinematics of the Bárðarbunga caldera ring fault; during the 2014–2015 rifting event and gradual caldera collapse, and its subsequent, ongoing re‐inflation. Tightly constrained focal mechanisms during re‐inflation have reversed phase arrival polarities from events during the caldera collapse. Thus, the inner side of the steeply dipping northern caldera faults (averaging 81 ± 8°) has been moving upwards during the post‐eruptive period. Both precise relative relocations of the seismicity and fault plane solutions confirm that this is due to slip reversal on the same ring fault structure.