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Monitoring and Studying Audible Sounds Inside Different Types of Soil and Great Expectations for its Future Applications
Pure and Applied Geophysics ( IF 2 ) Pub Date : 2020-09-11 , DOI: 10.1007/s00024-020-02583-0
Mohamed A. Gamal , Mohamed H. Khalil , George Maher

A majority of seismological studies are concerned with soil properties in low frequencies (1–10 Hz), but little is known about these properties in the audible sound domain (20–20,000 Hz). This is probably due to the high attenuation of the high frequencies within the soil, resulting in a minimal effect on buildings. For this study, 172 stations were recorded over different types of soils using variable types of P-wave and S-wave geophones to examine the variation of soil properties in the range of audible sound (20–3000 Hz). High resolution 32 bit spectrograms for the sounds recorded within every soil sample were analyzed. Moreover, a model for empty room was built in the subsurface to study changes in sound caused by the existence of large voids or cavities in the subsurface. The sound wave was able to differentiate between rigid, hard soil and softer, weaker soil. While high-strength rocks or soils tend to show sharp sound pitches (300–3000 Hz), weaker soils show lower sound pitches (20–100 Hz). The existence of subsurface voids or cavities tend to make sound pitches more regular, higher and sharper than those in the surrounding soils. This is most probably due to resonance of sound in closed places (e.g. a violin). Soil energy levels and how they change due to the soil’s excitation were studied. Soil research in the field of audible sounds is considered an emerging field with several applications (e.g. geological hazards, water exploration, and oil exploration and so on). There is a need for special high-resolution equipment to be developed for the same. This equipment should be capable of recording wide range of sound frequencies preserved in the soil and directly producing high-resolution spectrograms.

中文翻译:

监测和研究不同类型土壤中的可听声音及其未来应用前景

大多数地震学研究都关注低频(1-10 Hz)的土壤特性,但对可听声域(20-20,000 Hz)中的这些特性知之甚少。这可能是由于土壤中高频的高衰减,导致对建筑物的影响很小。在这项研究中,使用不同类型的 P 波和 S 波检波器在不同类型的土壤上记录了 172 个站点,以检查可听声音范围内(20-3000 Hz)土壤特性的变化。分析了每个土壤样本中记录的声音的高分辨率 32 位频谱图。此外,在地下建立了一个空房间模型,以研究由于地下存在大空隙或空洞而引起的声音变化。声波能够区分刚性、硬土和较软、较弱的土壤。虽然高强度的岩石或土壤倾向于显示尖锐的音高 (300-3000 Hz),但较弱的土壤显示较低的音高 (20-100 Hz)。地下空隙或空腔的存在往往会使声音比周围土壤中的声音更规则、更高、更尖锐。这很可能是由于封闭空间(例如小提琴)中的声音共振所致。研究了土壤能量水平以及它们如何因土壤激发而发生变化。可听声音领域的土壤研究被认为是具有多种应用(例如地质灾害、水勘探和石油勘探等)的新兴领域。需要为此开发特殊的高分辨率设备。
更新日期:2020-09-11
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