seismic sea waves, earthquakes, windstorms and the stretching of new deserts. The disasters have killed millions upon millions of people, destroyed countless homes, and wiped out numerous pieces of fertile l 在过去一百年,那里有heen频繁自然灾害,例如洪水,天旱、泥岩石流程、地震海波浪、地震,风暴和舒展...
Since the reactivation of Galeras volcano in 1988 its seismic activity has been dominated by a variety of LP waveforms and tremor events. Some of these signals occurred as a response to volcanic activity. Among them, two kinds of tremor deserve special attention, Flute tremor and Spasmodic ...
aAlmost any type of (safe) expiosive can ba used for seismic work. Often, mush of the energy delivered by an explosion is wasted in shattering rock near the shot point, and seismic waves are produced much more efficiently by shots fired in a metre or so of water. This effect is so ...
seismic wavesultrasonic velocity/ lab ultrasonic measurementsmaximum vitrinite reflectanceultrasonic quality factorultrasonic velocitiesanisotropic characteristicsS-wave quality factorsP-wave quality factorsLab ultrasonic measurements to metamorphic kinds of coal reveal the relationship between maximum vitrinite ...
Compared with the elastic characteristics of undeformed coals, such as P- and S-wave velocity ratios or Poisson's ratio, those of deformed coals generally decrease and the P-wave quality factors are less than those of S-waves. Moreover, the analysis of the relationship between pore structure ...
Compared with the elastic characteristics of undeformed coals, such as P- and S-wave velocity ratios or Poisson's ratio, those of deformed coals generally decrease and the P-wave quality factors are less than those of S-waves. Moreover, the analysis of the relationship between pore structure ...
SH pulse wavesData analysisStudy of basin effect has important reference significance for future urban the planning of earthquake prevention and disaster reduction. The amplification effects of three ideal simple basin models, "square" shape, "inverted convex" shape and "curved" shape, were studied ...