Mainly basaltic samples from 60 sites in the Yemen Volcanic Group show somewhat high degrees of between-site directional scatter, but enable normal, reversed and intermediate polarities to be identified during thermal demagnetisation. Individual chrons cannot be assigned directly from the…

,

,

La interpretación de sondeos de polarización inducida para medios con contraste pequeño en resistividad se plantea en términos de una ecuación integral lineal. Se presentan dos soluciones de esta ecuación: (a) una solución analítica mediante transformadas integrales, y (b) una…

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…

Single-source controlled audio-magnetotelluric (CSAMT) data, also known as vector CSAMT data, has been routinely collected and processed using the conventional 2-D induction model which does not incorporate galvanic distortion effects. However, the small number of data available in vector CSAMT…

The Coastal Zone Color Scanner (CZCS) flying on board the Nimbus-7 satellite provided oceanic photosynthetic pigment data during 1978-86. The CZCS data processing completed in 1990 furnished data on the global distribution of total pigment concentration and the vertical attenuation…

An approximate method is developed for inverting resistivity and induced polarization data. Inversion is effected in terms of cylindrical structures of arbitrary cross-section and length, using data token along a profile perpendicular to strike. The method does not require an…

This work describes in detail a data acquisition and processing system for magnetotelluric data. The system is capable of doing real time data processing that is, at the time of acquisition and also uses the remote reference technique to get…

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,…