ON THE REFRACTION OF SEISMIC PULSE AT THE CURVILINEAR BOUNDARY

Abstract

A theoretical result is obtained about the problem of refraction and reflection of an elasticplane pulse at a cylindrical boundary. It is assumed that the axis of cylinder is situated paral-lely to the wave front, which makes the problem a two-dimensional one, and that the front bedescribed by a step function, HC9-). First we treat only SH wave as an incident pulse, andlater, take into considerations about the more general case. K. Sassa once noticed the deflectionof incident angles of seismic initial disturbances around the Volcano Aso, and discussed thephenomena from a ray theory. The theoretical difference becomes clarified between ray andwave theories, in analysing in detail the actual data at the Aso Laboratory.1