2011年耶罗火山喷发前的地震活动模式
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摘要
在加那利群岛第一个被完全监测的火山于2011年10月10日在耶罗岛以南2km处开始喷发。这次海底火山喷发之前有各种各样的前兆信号,其中最明显的是在2011年7月开始出现的由人工拾取定位的近10 000个低震级地震组成的地震序列。这个地震活动序列揭示出从耶罗岛以北向南在10~17km之间的深度有20km的水平迁移,越向南地震的深度越深。我们应用相对定位算法(hypoDD)提高震源定位的精度。由此产生的地震分布更加紧凑,震源分布稍浅,并揭示了从北向南震源深度的明显差别。为了检查这些结果的可靠性所进行的检验给出重定位的最大不确定性为400m。此外还发现了新特征,包括在该岛中心地震活动的起源和在该岛以北在活动的最初一个月期间存在两个交替的孕震区。
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