Crustal Deformation and Seismic Velocity Perturbations in the Alto Tiberina Fault Zone (Northern Apennines, Italy)

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
C. Almagro Vidal, L. Zaccarelli, F. Pintori, E. Serpelloni
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Abstract

Crustal perturbations related to seismic activity can generally be observed with the occurrence of a large magnitude event. For less energetic seismic sequences though, the associated transient crustal variations are questionably measurable, and their observation gets easily obscured by relatively stronger perturbations such as the ones related to hydrological processes. In this study we reveal the significant role that terrestrial water-storage variations play in governing temporal crustal changes in the tectonically active Northern Apennines of Italy, and discuss the potential of accounting for its correction in order to monitor the relatively weaker transient perturbations caused by local seismic swarms. This area is characterized by an extensive level of low-energetic seismic activity, typically clustered in time and space, of which three main seismic swarms outstand during the 12 year period of study (2010–2021). Our analysis compares independent observations and processing methods of Global Navigation Satellite System measurements and ambient seismic noise recordings. We adopt a multivariate statistical approach to discriminate between independent sources of ground deformation, and seismic noise cross-correlation analysis to monitor relative seismic-velocity variations. The result shows how the perturbation effects produced by variations in total water content are dominant in both time series of ground deformations and seismic-velocity variations. After correcting for the water-related variation effects, our monitoring results reveal perturbations in the crustal properties whose activation time and depth range correlate with the occurrences of the seismic swarms.

Abstract Image

Alto Tiberina 断裂带(意大利亚平宁山脉北部)的地壳形变和地震速度扰动
与地震活动有关的地壳扰动一般可在发生大震级事件时观测到。但是,对于能量较小的地震序列,相关的瞬态地壳变化是难以测量的,其观测结果很容易被相对较强的扰动(如与水文过程相关的扰动)所掩盖。在这项研究中,我们揭示了陆地储水变化在控制意大利构造活跃的北亚平宁山脉的地壳时变方面所起的重要作用,并讨论了对其进行校正以监测当地地震群引起的相对较弱的瞬态扰动的可能性。该地区的特点是低能量地震活动频繁,通常在时间和空间上呈群集状态,在 12 年的研究期间(2010-2021 年),有三次主要地震群。我们的分析比较了全球导航卫星系统测量和环境地震噪声记录的独立观测和处理方法。我们采用多元统计方法来区分独立的地面变形源,并通过地震噪声交叉相关分析来监测相对地震速度变化。结果表明,在地面变形和地震速度变化的时间序列中,总含水量变化产生的扰动效应占主导地位。在校正了与水有关的变化效应之后,我们的监测结果揭示了地壳特性的扰动,其激活时间和深度范围与地震群的发生相关。
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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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