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In this paper a theoretic model is proposed to calculate the gas velocity in the subsoil based onradon concentration variations. The general transport equation for radon in a homogeneous soil with constantporosity is assumed. The diffusion coefficient and the gas velocity being constant. In order to illustrate the mo-del, three geological areas were considered: the Irazu and Arenal volcanoes, situated in the volcanic range inCosta Rica, and the Agua Caliente fault located in San Jose, Costa Rica.

Determinación de la velocidad de los gases en el subsuelo mediante un método basado en las variaciones de la concentración del gas radón