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首页> 外文期刊>Pure and Applied Geophysics >Challenges in the Detection of Ionospheric Pre-Earthquake Total Electron Content Anomalies (PETA) for Earthquake Forewarning
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Challenges in the Detection of Ionospheric Pre-Earthquake Total Electron Content Anomalies (PETA) for Earthquake Forewarning

机译：地震预警电离层前电气含量异常（PETA）的挑战

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摘要

Various studies have investigated the link between seismic activity and ionospheric precursory phenomena. Many of these retrospective case studies have supported the existence of pre-earthquake ionospheric anomalies by examining past earthquake events using a variety of analytical methods. Based on existing methodologies, however, the conversion of a retrospective analysis to a prospective forewarning scenario is not a straightforward process. The obstacles to its potential adoption stem mainly from assumptions made during data analysis and interpretation. In this study, several parameters pertaining to existing approaches for the detection of these ionospheric anomalies are highlighted and discussed, in particular ionosphere total electron content (TEC). A detailed examination is conducted to understand the roles that each of these parameters play in the detection process and the consequent difficulties when adopting them in a prospective analysis. These issues include accounting for variations in ionosphere characteristics owing to different measurement platforms (e.g. ground- and space-based observations) and statistical methods (e.g. standard deviation envelopes) used in detecting anomalies. Furthermore, the necessity of excluding space weather contributions in the underlying TEC fluctuations poses a challenge in determining the validity of observed ionospheric anomalies. The notion of an earthquake preparation zone is also evaluated in the context of the ionosphere, along with its implications in a forewarning scenario. These issues need to be addressed in current research in order to enable its possible application in earthquake forewarning.
机译：各种研究研究了地震活动和电离层前兆现象之间的联系。许多这些回顾性案例研究支持使用各种分析方法检查过去的地震事件来支持出地震电离层异常的存在。然而，基于现有方法，将回顾性分析转换为潜在预警情景不是一个直接的过程。其潜在采用的障碍主要来自数据分析和解释期间的假设。在该研究中，突出显示并讨论了有关检测这些电离层异常的现有方法的几个参数，特别是电离层总电子含量（TEC）。进行详细检查以了解这些参数中的每个参数在检测过程中发挥的作用以及在预期分析中采用它们时的困难。这些问题包括由于不同的测量平台（例如，基于地基和空间的观测）和用于检测异常的统计方法（例如标准偏差包络）的电离层特征的变化。此外，在潜在的TEC波动中排除空间天气贡献的必要性在确定观察到的电离层异常的有效性方面存在挑战。地震制备区的概念也在电离层的上下文中评估，以及其对预警情景的影响。这些问题需要在目前的研究中解决，以便在地震中可以在地震中申请。

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