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Minor earthquake sequences in the Amatrice-Norcia epicentral area (Central Italy)
Tectonophysics ( IF 2.9 ) Pub Date : 2021-03-31 , DOI: 10.1016/j.tecto.2021.228858
Melania Moschella , Maria Grazia Ciaccio , Diana Latorre

This study presents a detailed analysis of minor seismic sequences recorded in the Amatrice-Norcia area (central Italy) before 2016 when the most important seismic sequence of the last 40 years struck the region with the Mw 6.0 Amatrice and the Mw 6.5 Norcia earthquakes. We observe that, in the four decades before the 2016–2018 Amatrice-Visso-Norcia sequence, the instrumental seismicity rate is low, with maximum magnitudes lower than Mw 4.0, and is characterized by different types of behaviours as single shock events, swarms and minor sequences. For the first time, we relocate the minor seismicity recorded before 2016 by the Italian National Seismic Network of the Istituto Nazionale di Geofisica e Vulcanologia by applying the nonlinear inversion code NonLinLoc in a local velocity model. Revised earthquake locations of the past seismic sequences are compared to the recent 2016–2018 seismicity in order to investigate some possible correlations with the seismogenic structures reactivated in 2016. With this goal, we also integrated our new hypocentral locations with fault plane solutions and geological data to interpret our results with respect to the 2016–2018 seismicity. Our results show how some of the structures identified by the minor seismicity before 2016 were reactivated during the recent sequence, while others seismic structures remained silent. We therefore highlight how the study of minor seismic sequences provides important information about the seismogenic attitude of less active or less known seismogenic structures with consequent impact on the evaluation of the seismic hazard.



中文翻译:

Amatrice-Norcia震中地区(意大利中部)的小地震序列

这项研究提供了对2016年之前阿马特里斯-诺尔恰地区(意大利中部)记录的次要地震序列的详细分析,当时过去40年中最重要的地震序列发生了6.0级阿马里切特和6.5级诺尔恰地震。我们观察到,在2016–2018年Amatrice-Visso-Norcia序列之前的四个十年中,仪器地震活动率较低,最大震级低于Mw 4.0,并且具有不同类型的行为,如单次冲击事件,群体和次要序列。我们首次通过在局部速度模型中应用非线性反演代码NonLinLoc来重新定位2016年之前由意大利国家地球物理研究所的意大利国家地震台网记录的次要地震活动。将过去地震序列的修订地震位置与最近的2016-2018年地震活动度进行比较,以研究与2016年重新启用的地震成因结构的可能相关性。为此,我们还将新的震中位置与断层平面解和地质数据进行了整合解释我们关于2016-2018年地震活动的结果。我们的结果表明,在最近的序列中如何重新激活在2016年之前被小地震活动识别的某些结构,而其他地震结构却保持沉默。因此,我们强调了对次要地震序列的研究如何提供有关不太活跃或鲜为人知的地震发生结构的地震发生姿态的重要信息,从而对地震危险性的评估产生影响。

更新日期:2021-04-11
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