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An automatic data acquisition system for field resistivity measurements was developed at CICESE. The system applies a known current to the ground, measures the induced voltage, and calculates the apparent resistivity. All measurements are converted to digital format, at a…

Gravimetric data have been accumulated on 22 calderas mainly in Japan. For some, explosion-seismic data or drilling results are also available. Synthesizing these data, some common features of their subsurface structure are deduced. Although all Japanese calderas are relatively young,…

Based on the volumes of the erupted material and duration times of the March-April 1982 eruptions of the El Chichón volcano, the heights and flow velocities of the eruptive columns are evaluated. The velocities obtained are higher than 400 m/sec…

Levels of oxidants in the atmosphere at several sites in the Mexico City Metropolitan Area have been recorded since 1975. Evidence of atmospheric transport of pollutants such as ozone have been observed towards the southern end of the Mexico Valley…

Data from µ-meson telescopes, at different underground depths, have been compared with the predictions of a solar-controlled mechanism proposed by Swinson. The observations at ground level and at moderate depths show a significant field-polarity dependent effect of the kind envisaged…

Uranium, Thorium and Potassium contents of some igneous and sedimentary rocks of the Guanajuato Mineral District have been measured by γ-ray scintillation spectrometry. Preliminary measurements show that the area studied is not a province of high radioactive contents. The data…

A method is presented for the estimation of seismic risk in regions whose seismic history is incomplete and for which no acceleration data exists, based on Monte Carlo Simulations of the seismic process, using a minimum of assumptions.Application of this…

Survey of observational data on desert dust storms and physical properties of dust (whit emphasis on results from complex observational programs accomplished in the USSR) has been given. Satellite observations of dust storms and their consequences have been considered in…

Some consideration of the adequate production of solar radiation information useful for solar energy planners and designers are shown here. Techniques for estimation of solar radiation on horizontal and inclined surfaces are discussed and  methods of application for developing countries…