Studying the high frequency seismic signals for enhanced knowledge of the shallow Earth structure and soil investigation

IF 0.7 Q4 GEOCHEMISTRY & GEOPHYSICS
Mohamed A. GAMAL, George MAHER
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引用次数: 0

Abstract

The Earth acts like a low-pass filter to earthquake energy so that frequencies higher than 10 Hz are rapidly attenuated. This intrigues seismologists about the seismic waves in the frequency domain 1–10 Hz, which is crucial to correctly assess the impact of seismic shaking on structures. However, not much attention has been paid to higher frequencies, probably due to its low significance and structural damage. The Earth has high frequency seismic signal (HFSS) in the audible frequency range 20–20,000 Hz and maybe higher (Gamal et al., 2020). These seismic signals result from the transformation of any energy into HFSS energy which is propagated inside the Earth, this energy may be winds, the crustal structure movement, movement due to gravitational force or any mechanical energy transformed into high frequency seismic vibrations. Fifteen different geological environments were tested in Egypt, to monitor the high frequency seismic signals (HFSS) of the subsurface soil. The present study used very high digitising frequency seismographs, not less than 8,000 to 16,000 sample per second, and a set of horizontal and vertical geophones of natural frequencies in the ranges of 4 Hz to 100 Hz. It was found that consolidated rocks have high-pitch that may reach 4,000 Hz, while weak fractured soils sound have a low-pitch, in the frequency range of 20–70 Hz. Speech and audio processing methods have been used to differentiate between these HFSS preserved inside soils and to produce the “unified HFSS map”. The “Soil HFSS map” was considered as avail science could be used in the future to give deep insight on the shallow Earth's interiors.
研究高频地震信号,提高对浅层土体结构和土壤调查的认识
地球对地震能量的作用就像一个低通滤波器,因此高于10赫兹的频率被迅速衰减。这引起了地震学家对频率域1 - 10hz地震波的兴趣,这对于正确评估地震震动对结构的影响至关重要。然而,可能由于其重要性低和结构损伤,对更高频率的关注并不多。地球有高频地震信号(HFSS),其可听频率范围为20-20,000 Hz,甚至更高(Gamal et al., 2020)。这些地震信号是由任何能量转化为HFSS能量在地球内部传播的结果,这种能量可能是风,地壳结构运动,重力运动或任何机械能转化为高频地震振动。在埃及测试了15种不同的地质环境,以监测地下土壤的高频地震信号(HFSS)。目前的研究使用了非常高的数字化频率地震仪,每秒不少于8000至16000个样本,以及一套自然频率在4赫兹至100赫兹范围内的水平和垂直检波器。研究发现,固结岩石的声音具有可达4000 Hz的高音调,而弱断裂土的声音具有20 ~ 70 Hz的低音调。语音和音频处理方法已被用于区分这些保存在土壤中的HFSS,并产生“统一的HFSS地图”。“土壤HFSS地图”被认为是有用的科学,可以在未来用来深入了解地球浅层的内部。
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来源期刊
Contributions to Geophysics and Geodesy
Contributions to Geophysics and Geodesy GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.20
自引率
14.30%
发文量
0
审稿时长
20 weeks
期刊介绍: CGG publishes original research papers, short and rapid communications and review articles covering a wide spectrum of earth science disciplines including deep structural geophysics, geodynamics, tectonics, near surface geophysics, applied and environmental geophysics, geomagnetism, seismology, paleomagnetism, space weather, geodesy and geomatics, surveying engineering, hydrology, hydro-geology, atmospheric science, climatology.
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