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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Tectonic seismicity at Stromboli volcano (Italy) from historical data and seismic records
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Tectonic seismicity at Stromboli volcano (Italy) from historical data and seismic records

机译：历史数据和地震记录的斯特龙博利火山（意大利）的构造地震活动

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摘要

We describe the main features of crustal tectonic seismicity in the area of Stromboli, Aeolian Islands, a volcano known worldwide for its typical Strombolian activity. We consider data from the Italian catalogues of earthquakes along with records of the local seismic network, covering the time span from 1885 to 1998. In the historical catalogues we find a low occurrence rate of earthquakes, with a small number of seismic events having intensity >= VIII in the Mercalli-Cancani-Sieberg scale. Recent instrumental data confirm this finding, achieving a maximum magnitude M_d 3.7. We explain this low tectonic seismicity as the effect of conditions which allow only a limited storage of stress. From a seismic viewpoint, the Aeolian Archipelago shows two different seismogenic domains spatially separated by the Aeolian-Tindari-Giardini fault system. One domain, which includes the western and southern parts of the Aeolian Islands, is characterized by crustal seismic activity. The second domain, which includes the eastern part of the archipelago where Stromboli lies, has a large number of intermediate and deep earthquakes, but little crustal seismicity. We surmise that each domain has vertical heterogeneity separating ductile deformation from brittle failure of rock induced by temperature conditions and/or hydration/dehydration reactions, which affect the mechanical strength of the medium.
机译：我们描述了在风神斯特隆博利地区的地壳构造地震活动的主要特征，该地区以其典型的斯特隆伯里亚活动而闻名世界。我们考虑了意大利地震目录中的数据以及当地地震网络的记录，涵盖了从1885年到1998年的时间跨度。在历史目录中，我们发现地震的发生率较低，少数地震事件的强度> = Mercalli-Cancani-Sieberg量表中的VIII。最近的仪器数据证实了这一发现，达到了最大幅度M_d 3.7。我们将这种低构造地震活动解释为条件的影响，这种条件仅允许有限的应力存储。从地震的角度来看，风沙群岛显示了两个不同的地震成因区域，它们在空间上被风沙-廷达里-贾尔迪尼断裂系统隔开。一个区域包括风沙群岛的西部和南部，其特征是地壳地震活动。第二个区域包括斯特龙博利岛所在的群岛东部，发生了大量中级和深部地震，但地壳地震活动性很小。我们推测每个区域都具有垂直非均质性，从而将延性变形与温度条件和/或水合/脱水反应引起的岩石脆性破坏分开，从而影响了介质的机械强度。

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