当前位置: X-MOL 学术Solid Earth › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A functional tool to explore the reliability of micro-earthquake focal mechanism solution for seismotectonic purposes
Solid Earth ( IF 3.4 ) Pub Date : 2021-08-10 , DOI: 10.5194/se-2021-88
Guido Maria Adinolfi , Raffaella De Matteis , Rita De Nardis , Aldo Zollo

Abstract. Improving the knowledge of seismogenic faults requires the integration of geological, seismological, and geophysical information. Among several analyses, the definition of earthquake focal mechanisms plays an essential role in providing information about the geometry of individual faults and the stress regime acting in a region. Fault plane solutions can be retrieved by several techniques operating in specific magnitude ranges, both in the time and frequency domain and using different data. For earthquakes of low magnitude, the limited number of available data and their uncertainties can compromise the stability of fault plane solutions. In this work, we propose a useful methodology to evaluate how well a seismic network used to monitor natural and/or induced micro-seismicity estimates focal mechanisms as function of magnitude, location, and kinematics of seismic source and consequently their reliability in defining seismotectonic models. To study the consistency of focal mechanism solutions, we use a Bayesian approach that jointly inverts the P/S long-period spectral-level ratios and the P polarities to infer the fault-plane solutions. We applied this methodology, by computing synthetic data, to the local seismic network operated in the Campania-Lucania Apennines (Southern Italy) to monitor the complex normal fault system activated during the Ms 6.9, 1980 earthquake. We demonstrate that the method we propose can have a double purpose. It can be a valid tool to design or to test the performance of local seismic networks and more generally it can be used to assign an absolute uncertainty to focal mechanism solutions fundamental for seismotectonic studies.

中文翻译:

一种功能性工具,用于探索用于地震构造目的的微震震源机制解的可靠性

摘要。提高对发震断层的认识需要整合地质、地震和地球物理信息。在多项分析中,地震震源机制的定义在提供有关单个断层的几何形状和作用于一个区域的应力状态的信息方面起着至关重要的作用。故障平面解决方案可以通过在特定幅度范围内运行的多种技术在时域和频域中使用不同的数据进行检索。对于低震级地震,可用数据的数量有限及其不确定性会危及断层面解的稳定性。在这项工作中,我们提出了一种有用的方法来评估用于监测自然和/或诱发微地震估计震源机制的地震网络作为震级、位置、和地震源的运动学及其在定义地震构造模型中的可靠性。为了研究震源机制解的一致性,我们使用贝叶斯方法联合反演 P/S 长周期谱级比和 P 极性来推断断层面解。我们通过计算合成数据将这种方法应用于在坎帕尼亚-卢卡尼亚亚平宁山脉(意大利南部)运行的当地地震网络,以监测 1980 年 6.9 级地震期间激活的复杂正断层系统。我们证明我们提出的方法可以有双重目的。它可以是设计或测试本地地震网络性能的有效工具,更普遍地,它可以用于为地震构造研究的基础震源机制解决方案分配绝对不确定性。
更新日期:2021-08-10
down
wechat
bug