Study on Dating of Active Faults by means of Background Dosimetry and Paleomagnetic Measurement

The second phase was focused mainly into the dosimetric dating of fault gouges along the earthquake fault, since the method can give more dirtect informations for the fault activity. Here, both thermoluminescense (TL) and elctron spin resonance (ESR) techniques were used. TL glow curves showed that the 1585 event did not completely erase paleodose responsible for the TL output more than 240゜C. Finally, more probable ages of 300-350 years b.p. could be estimated using a initial value for residual dosage because of incompleteness at the time of the slip event, while conventional calculation give rather old ages ranging from 2000-3000 years b.p.