The geological characteriscitc of Los Humeros caldera (19°42'N, 97°25'W) suggest that the mechamism of heat transfer is mostly of the conductive type. Assuming this mechanism and the available geological and geophysical data it is possible to compute the temperature field…

Mean palaeomagnetic directions and pole positions deriven from seven lower Tertiary volcanic units exposed in central-southern Mexico after alternating field and thermal demagnetization diverge from corresponding data of northern Mexico. The studied unists are two lavas of the Palaeocene-Eocene Balsas…

Reliable formulae for the computation of travel time residuals and partial derivatives for the inverse problem in two dimensions based on ray tracing are developed. The partial derivatives are completely determined by the path and the travel time residuals are…

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…