Since 1995 it had been making continuous measurements of the radioactive isotope Radon-222 emissions in soils at Galeras and Nevado del Ruiz volcanoes; and on active geological faults in Narino, Cauca and Caldas districts. The E-PERM ionizing chamber system has been used in the Radon-222 monitoring, trapping this gas in the B horizont of soils. In zones of active faulting it has been stablished Radon soil emissions between 1000 and 2500 pCi/L. In some crossings of active faults it has been measured levels of25000 pCilL. In the present work appears a compilation of examples of the registered anomalous emissions in several stations before earthquakes of tectonic character. Examples of registered Radon anomalies before: I) events of magnitudes between 2 and 4; 2) the Quindio earthquake of january 1999; and 3) the occurrence of seismic swarms registered by the seismological networks of the Volcanological and Seismological Observatories at Pasto and Manizales, are described.