从长达10年的高分辨率地震目录中了解低角度正断层:上蒂伯里纳断层案例研究(意大利亚平宁山脉北部)

IF 4.1 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Samer Bagh, Raffele Di Stefano, Adriano Gualandi, Debora Pantaleo, Carlo Calamita, Chiara Ladina, Simone Marzorati, Lauro Chiaraluce
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引用次数: 0

摘要

位于意大利亚平宁山脉北部的上蒂伯里纳断层(ATF)是世界上监测最广泛的低角度正断层(lanf)之一,拥有上蒂伯里纳近断层观测站(TABOO-NFO)。根据新的10年(2010-2020年)地震目录,对ATF的下倾几何形状、力学特性和运动学进行了修订。TABOO-NFO地震台网的密集配置实现了较低的检测阈值,从而产生了近10万个ML <事件的目录;3.9和完整震级≈0.1 (ML尺度),利用优化的一维速度模型和新估计的静站校正确定了高分辨率震源位置。ATF断裂带内微震活动的分布和运动学证实了沿LANF主平面存在锁定部分。在ATF被锁住的浅层部分,应力积累导致了小型反斜和展斜构造的发展,这些构造在上盘具有良好定向的滑动面,承载了小型地震序列。在断层的较深部分,低摩擦岩性可能促进蠕变,这被认为促进了稳定滑动。聚类分析进一步表明,ATF系统的地震活动主要以群而不是主震-余震序列演变,突出了地震蠕变和应力分布模式对地震活动的控制作用。我们的发现为lanf的机制提供了重要的见解,并强调了在地震危险模型中包括主断层及其次级结构的重要性,这对全球其他爬行断层系统具有启示意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Insights Into a Low Angle Normal Fault From a 10-Year-Long High-Resolution Earthquake Catalog: The Alto Tiberina Fault Case Study (Northern Apennines, Italy)

Insights Into a Low Angle Normal Fault From a 10-Year-Long High-Resolution Earthquake Catalog: The Alto Tiberina Fault Case Study (Northern Apennines, Italy)

Insights Into a Low Angle Normal Fault From a 10-Year-Long High-Resolution Earthquake Catalog: The Alto Tiberina Fault Case Study (Northern Apennines, Italy)

Insights Into a Low Angle Normal Fault From a 10-Year-Long High-Resolution Earthquake Catalog: The Alto Tiberina Fault Case Study (Northern Apennines, Italy)

Insights Into a Low Angle Normal Fault From a 10-Year-Long High-Resolution Earthquake Catalog: The Alto Tiberina Fault Case Study (Northern Apennines, Italy)

Insights Into a Low Angle Normal Fault From a 10-Year-Long High-Resolution Earthquake Catalog: The Alto Tiberina Fault Case Study (Northern Apennines, Italy)

The Alto Tiberina fault (ATF) in the Northern Apennines of Italy is one of the most extensively monitored low-angle normal faults (LANFs) worldwide, hosting The Alto Tiberina Near Fault Observatory (TABOO-NFO). The down-dip geometry, mechanical properties, and kinematics of the ATF have been revised based on a new 10-year (2010–2020) earthquake catalog. The dense configuration of TABOO-NFO seismic network enabled a low detection threshold, resulting in a catalog of almost 100,000 events with ML < 3.9 and completeness magnitude ≈0.1 in ML scale, with high-resolution hypocentral locations determined using an optimized 1D velocity model and newly estimated static station corrections. The distribution and kinematics of microseismicity within the ATF fault zone confirm the presence of locked portions along the main LANF plane. Stress build-up in the locked shallow parts of the ATF results in the development of minor antithetic and splay structures with well-oriented slip planes in the hanging-wall, hosting small seismic sequences. In the deeper parts of the fault, creep may be facilitated by low-friction lithologies, which are thought to promote stable slip. Clustering analysis further shows that the seismic activity of the ATF system evolves predominantly as swarms rather than as main shock-aftershock sequences, highlighting the role of aseismic creep and stress distribution pattern in controlling seismicity. Our findings provide a major insight into the mechanics of LANFs and emphasize the importance of including both the primary fault and its secondary structures in seismic hazard models, with implications for other creeping fault systems worldwide.

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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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