The influence of great earthquakes on volcanic eruption rate along the Chilean subduction zone
The influence of great earthquakes on volcanic eruption rate along the Chilean subduction zone
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DOI：
10.1016/j.epsl.2008.11.005
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发表时间：
2009-01
影响因子：
5.3
通讯作者：
S. Watt;D. Pyle;T. Mather
中科院分区：
文献类型：
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作者：
S. Watt;D. Pyle;T. Mather
地震活动被假定为在一系列时间尺度上触发火山爆发的触发因素，但使用全球数据集证明在几天以上的时间尺度上触发火山爆发的发生是困难的。在这里，我们使用智利和安第斯南部火山带的历史地震和喷发记录来调查大地震后的喷发率。我们发现，在MW>8的地震之后，火山喷发率显著增加，特别是在1906年和1960年，在更早的记录中也发生了类似的事件。在1906年和1960年地震后的约12个月内，喷发率高于背景水平，估计每次都有3-4次喷发受到地震的影响。喷发位置表明，这些影响发生在近场到地震破裂带界限以外约500公里或更远的距离。这表明，与大地震相关的动态和静态应力在喷发触发过程中都很重要，并有可能在几个月的时间尺度内在弧环境中引发火山喷发。
Seismic activity has been postulated as a trigger of volcanic eruption on a range of timescales, but demonstrating the occurrence of triggered eruptions on timescales beyond a few days has proven difficult using global datasets. Here, we use the historic earthquake and eruption records of Chile and the Andean southern volcanic zone to investigate eruption rates following large earthquakes. We show a significant increase in eruption rate following earthquakes of MW>8, notably in 1906 and 1960, with similar occurrences further back in the record. Eruption rates are enhanced above background levels for ~12 months following the 1906 and 1960 earthquakes, with the onset of 3–4 eruptions estimated to have been seismically influenced in each instance. Eruption locations suggest that these effects occur from the near-field to distances of ~500 km or more beyond the limits of the earthquake rupture zone. This suggests that both dynamic and static stresses associated with large earthquakes are important in eruption-triggering processes and have the potential to initiate volcanic eruption in arc settings over timescales of several months.