Abstract: In this paper we discuss the three-dimensional quasi-static problems by using the magnetothermo elastic ity theory, which is related to geotherm: the situations of the heat-carrying fluid intruding into theverticalor horizontal cracks, and the case of static local hightemperature regions. After giving their approximate ex pressions, we focus on the space-timedistribution of perturbation of magnetic field. Lastly, its application in theoretical study of seismology is emphasized.

Key words: Magnetothermo elastic ity, Quasi-static, Seismic development