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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Seismic hazard assessment at Mt. Vesuvius: Maximum expected magnitude
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Seismic hazard assessment at Mt. Vesuvius: Maximum expected magnitude

机译：富士山地震危险性评估维苏威火山：最大预期强度

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This paper deals with the problem of seismicity at Mt. Vesuvius with a view to providing an estimation of the maximum expected earthquake. Integrated analysis of both historical and current seismicity as well as the geological conditions of Vesuvius and the surrounding areas show that seismogenetic structures may fall within the crater axis and at the boundaries of the volcanic complex. While activation of the whole seismogenetic volume detected by seismicity in the past 30 years would indicate a total seismic moment of Mo=7.1E+ 15 Nm for a magnitude M=4.5, knowledge of the area's geological structure suggests faulting surfaces of about 32 km~2 with an associated magnitude of M=5.4. The areas of maximum expected damage differ according to the orientation of the hypothesized structure. Analysis of geological and geophysical data and the damage associated to the AD 62 earthquake shows that the prevailing directions in the faulting planes are NE-SW in the eastern sector of the volcanic complex, and roughly WNW-ESE in the southern part of the volcano along the coast. Comparison of instrumental seismicity and historical data reveals two significantly different energy levels: a lower earthquake level with Mmax=4.5, corresponding to current seismicity and that which accompanied volcanic activity in the eruptive period from 1631—1944; an upper level with Mmax=5.4, represented by the AD 62 earthquake. The two levels correspond to two stress states and different seismogenetic structures.
机译：本文讨论了山顶地震活动性的问题。维苏威火山，目的是估计最大预期地震。对历史和当前地震活动性以及维苏威火山及其周围地区的地质条件的综合分析表明，地震成因结构可能落在火山口轴线内和火山群的边界。在过去30年中，通过地震活动探测到的整个地震发生体积的激活将指示Mo = 7.1E + 15 Nm的总地震矩，震级为M = 4.5，该地区的地质结构知识表明断层表面约为32 km〜2与相关的M = 5.4的大小。最大预期损坏的区域根据假定结构的方向而有所不同。对地质和地球物理数据以及与公元62年地震相关的破坏的分析表明，断层平面中的主要方向是火山复合体东部的NE-SW，沿火山南部大致为WNW-ESE海岸。仪器地震活动性和历史数据的比较显示出两个显着不同的能级：Mmax = 4.5的较低地震级，对应于当前地震活动性；以及1631年至1944年爆发期间伴随火山活动的地震活动级； Mmax = 5.4的高层，由公元62年地震代表。这两个水平对应于两个应力状态和不同的地震发生结构。

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