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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。
The first completely monitored volcano in the Canary Islands began to erupt 2 km south of El Hierro on October 10, 2011. A variety of precursor signals preceded the submarine volcanic eruption, most notably the seismic sequence of nearly 10,000 low-magnitude earthquakes picked up manually by July 2011 that began in July 2011. This sequence of seismic activity reveals a horizontal migration of 20 km from north to south El Hoe at depths of 10-17 km, with the deeper the more southward the earthquake. We use the relative positioning algorithm (hypoDD) to improve the accuracy of source positioning. The resulting distribution of earthquakes is more compact and the source distribution is slightly sharper, revealing a clear difference in depth from north to south. The tests conducted to check the reliability of these results give a maximum uncertainty of relocation of 400 m. New features were also discovered, including the origin of seismicity in the center of the island and the presence of two alternating seismogenic zones in the north of the island during the first month of activity.