米兰多拉逆冲真的与2012年艾米利亚地震序列(意大利北部)有关吗?对触发地震活动效应可能性的影响

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Bollettino Di Geofisica Teorica Ed Applicata Pub Date : 2015-01-01 DOI:10.4430/BGTA0162
G. Lavecchia, R. Nardis, G. Costa, L. Tiberi, F. Ferrarini, D. Cirillo, F. Brozzetti, P. Suhadolc
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引用次数: 9

摘要

我们展示了一项跨学科研究的结果,旨在确定由Emilia 2012冲断层序(MW高达6.1)激活的断层段的几何形状,该断层段位于Ferrara Arc(意大利北部)的前部,自1980年以来一直在进行油气开采(Cavone油田)。我们重新定位了2012年5月20日至6月12日期间有记录的40次地震,震级普遍≥4.0,加上2011年7月17日发生在附近地区的一次地震(震级5.0)。讨论了该地区的地质和地震构造背景,阐述了跨震源体的一些解释地质剖面,并将已确定的单个发震断层段的形状用深度等高线表示。由此产生的地震/断层关联突出了一个相当复杂的分割模式,涉及四个相邻的震源,都属于ssw倾斜的费拉拉逆冲系统。Emilia 2012层序的两个主要活动并没有激活Cavone储层下方的Mirandola冲断构造,尽管这一冲断构造被一些主要集中在油气田附近的辅助活动所照亮。讨论了Cavone油田内采注活动引发地震活动性效应的可能性。
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Was the Mirandola thrust really involved in the Emilia 2012 seismic sequence (northern Italy)? Implications on the likelihood of triggered seismicity effects
We present the results of an interdisciplinary study aimed at defining the geometry of the fault segments activated by the Emilia 2012 thrust sequence (MW up to 6.1), which are located at the front of the Ferrara Arc (northern Italy) and partially overlap with an area undergoing hydrocarbon exploitation since 1980 (Cavone oil field). We relocate 40 well-recorded earthquakes with MW prevailingly ≥4.0 in the time interval from May 20 to June 12, 2012, plus an event that occurred in a nearby area on July 17, 2011 (MW 5.0). The geological and seismotectonic setting of the area is discussed, some interpretative geological sections across the hypocentral volumes are elaborated, and the shape of the identified individual seismogenic fault segments is schematically represented as depth contour lines. The resulting earthquake/fault association highlights a rather complex segmentation pattern, with four neighbouring sources involved, all belonging to the SSW-dipping Ferrara Thrust System. The two main events of the Emilia 2012 sequence did not activate the Mirandola thrust underlying the Cavone reservoir, although this thrust was illuminated by some subsidiary activity mainly concentrated close to the hydrocarbon field. The likelihood of triggered seismicity effects due to the extraction/ injection activities within the Cavone oil field are discussed.
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Bollettino Di Geofisica Teorica Ed Applicata
Bollettino Di Geofisica Teorica Ed Applicata 地学-地球化学与地球物理
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期刊介绍: The "Bollettino di Geofisica Teorica ed Applicata" is an international open access journal dedicated to the publication of original papers dealing with Deep Earth Geophysics, Near Surface Geophysics, Exploration Geophysics, Borehole Geophysics, Geodynamics and Seismotectonics, Seismology, Engineering Seismology, Geophysical Modelling, Geodesy, Remote Sensing, Seismic and Geodetic Networks, Oceanography, and their application in the fields of Energy, Natural Resources, Environment and Climate, Policies and Regulations, Risk and Security, Technological Development.
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