Seismogram of an aftershock of the strong earthquake that occurred in the Dubrovnik area on 5 September 1996. P and S denote longitudinal (faster) and transversal (slower) waves, respectively; Pg and Sg are direct waves, while Pn and Sn stand for the waves refracted along the Mohorovicic discontinuity. Epicentral distance is estimated on the basis of the difference of traveltimes of S and P waves. Back