期刊
ENGINEERING GEOLOGY
卷 311, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.enggeo.2022.106912
关键词
Electromagnetic radiation; Brittle rock strain; Microcracking; Seismogenic fault; Eastern Alps
资金
- Institute of Rock Structure & Mechanics of the Czech Academy of Sciences
- Austrian Science Fund [FWF P25884 -N29]
- conceptual development research organisation of the Institute of Rock Structure & Mechanics, the Czech Academy of Sciences [RVO: 67985891]
- infrastructural project CzechGeo/EPOS [LM2015079]
This study investigates the effects of brittle rock strain and microcracking on earthquakes through monitoring electromagnetic radiation, and finds a strong correlation between high energy broadband impulses and lightning activity, as well as a relationship between low energy broadband impulses and local rock strain.
Ultralow frequency (ULF) to low frequency (LF) electromagnetic radiation represents one of the most promising effects of brittle rock strain and microcracking that might be potentially helpful for short term earthquake forecasting. In this study the results of a six month monitoring campaign are presented from Obir Cave in the eastern Alps. Direct experimental observations of electromagnetic radiation have been made using a customised broadband data logger installed next to the Obir Fault -this seismogenic fault near the Periadriatic Lineament is known to be related to at least three large prehistoric earthquakes. On the basis of these measurements it has been possible to characterise a number of distinct signals: artificial constant narrowband signals at discrete frequencies; short serial broadband impulses; high energy broadband impulses; and low energy broadband im-pulses. The narrowband artificial signals were removed from the electromagnetic radiation time series analysis so that the natural signals were enhanced and could be compared more easily to meteorological parameters and rock strain indicators. Critically, the high energy broadband impulses show a strong correlation with lightning activity across much of central Europe and the eastern Mediterranean while the low energy broadband impulses appear to be associated with local rock strain in and around Obir Cave. Unfortunately, it seems certain that some of the essential strain related impulses are likely to have been overprinted by the larger lightning related impulses.
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