A modified version of Maeda’s viscoelastic model of mass ejection is applied to the 1998-1999 eruptive period of Volcán de Colima, Mexico. The model fits reasonably well the observed volume and volume rate of the eruption, assuming a magma chamber…

Establishment of sequence limits in a stratigraphic column (i.e., related to depositional environments) re-presents in particular a great contribution to the analysis and characterization of oil reservoirs. In this context, we applied the continuous as well as the discrete wavelet…

The relationships between the rainy season and corn yields in São Paulo State were investigated. The results showed that rainfall and corn yields are strongly positively correlated in most of the region, particularly in the northeastern, eastern, northwestern and western…

Two types of intraslab earthquakes in the subducted Cocos plate occur below Guerrero, Mexico, and adjacent areas: (A) steeply-dipping thrust earthquakes, and (B) normal-faulting earthquakes. Type A events are located ~10-35 km from the coast at a depth of ~35…

By means of linear regression, an empirical expression was derived to estimate the height of the F region peak (hmF2) which, among other 7 measures calculated, offers the best adjustment with the N(h) profiles data obtained in Havana. Statistical analysis…

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,…

Detailed paleomagnetic, rock-magnetic, ore-microscopy, scanning electron microscopy (SEM) and anisotropy of magnetic susceptibility (AMS) studies of volcanic units from Arandas-Atotonilco, NW Jalisco State, Mexico are reported. Units are basaltic and basaltic-andesites flows of Miocene age (date by K-Ar). The magnetic…

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…

Even after proper field static corrections are applied, the lack of continuity in the reflection horizons in a seismic section can be attributed to residual static effects produced by lateral heterogeneities, topographic irregularities and/or changes in the velocity of the…