MODELING OF CRUSTAL DEFORMATION IN VOLCANIC AREAS

Mogi (1958) used a centre of dilatation in an elastic half-space to mo del the ground deformation in volcanic areas. We consider four additio nal axially-symmetric source models, namely, a single force, a dipole, a tensile dislocation and a compensated linear vector dipole (CLVD) a nd compare the corresponding surface deformation with the surface defo rmation due to a centre of dilatation. It is found that the vertical d isplacements due to a dipole, a tensile dislocation and a CLVD decay m uch faster as compared to the vertical displacement due to a centre di latation. Moreover, while a centre of dilatation predicts uplift at al l epicentral distances, a dispole of a CLVD predicts subsidence after a certain epicentral distance.