We have recently presented (López es al..1978) rare earth element (REE) data of the theoleiitic basalts sampled during a dreding transect at 23° N in the mouth of the Gulf of California, Mexico. The samples are distributed between the East…

We interpret a new compilation of total-field magnetic anomaly data from the eastern part of the Maya Terrane, comprising aeromagnetic data for the Yucatán Peninsula and marine magnetic data for its northern and eastern continental margins. Qualitatively, on the basis…

Utilizando datos reales, se obtiene un modelo espectral no -adiabático modificado con la ayuda de métodos estadísticos para similar en la forma mas aproximada las fluctuaciones no regulares. Dicho modelo se aplica para reproducir las ondas  atmosféricas mas largas. Los…

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…

A horizontal layer of water, cooled below 4 °C on its bottom surface, can convect into the stably stratified water above the level of maximum density. A quantitative theory of this penetrative convection is proposed for the fully turbulent regime.…

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…

The remanent magnetization intensities of eight extrusive igneous units of Cenozoic age from Jalisco State, México, are found to have a distribution which approximates to a logarithmic gaussian distribution. The sample population(104) ai better represented by statistical parameters derived from…

Analytical expressions are proposed and best fitted to the experimental values evaluated by Paul Frenzen in 1963, for the Langrangian Autocorrelation Function R(ξ) of turbulent fields generated in fluids of several gravitational stabilities. It is demonstrated that the analytical expressions…