Erratum to: “The use of microchemical analysis of alluvial gold grains in mineral exploration: experiences in Britain and Ireland” [J. Geochem. Explor. 71 (2000) 241–268]
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Mineral exploration
Abstract A brief review is given of the state-of-the-art and the theory involved in the influence of geology on seismic response. Several field experiments are described which were performed to determine the dynamic amplification of seismic response by alluvium. In the Dry Lake area (saturated alluvium) resonant depths of alluvium were observed at 500 feet and 1400 feet. This is in approximately the harmonic ratio as predicted by theory. In the Hidden Valley area (dry alluvium) the resonant depth of alluvium was observed at 300 feet. The ratio of 500 feet to 300 feet for the two areas is in fair agreement with the ratio of 7000 feet to 5300 feet for the velocities of the alluvium in the two areas as determined by the refraction surveys.
Seismic refraction
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Abstract Damage distribution in Skopje can be explained in terms of the seismic response of surficial soils. There exists a generally good correlation between the distribution of damage, the thickness of the surficial soil layer, and the predominant periods of microtremors. The most heavily damaged region is covered with about 20 to 30 meters of alluvium, and the predominant period of this alluvium is about 0.36 seconds. The alluvium in this heavily damaged region probably was shaken near its resonant frequency, and soil amplification may have reached three. The greatest destruction was recorded along a belt which is defined by an abrupt change of the thickness of the alluvium. However, heavy destruction was also recorded on the shallow alluvium side, and no clear explanation exists for this.
Alluvial soils
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Based on the practice of artificial freezing engineering in deep alluvium and simulation tests, it is found that there exists an obvious difference between frozen soil mechanics for shallow alluvium and for deep alluvium. The concept of frozen soil mechanics for deep alluvium, its research topics and methods are presented in this paper.
Soil Mechanics
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