AN EARTHQUAKE MEASURING 6.1 ON THE RICHTER SCALE JOLTED TAIWAN FRIDAY, BUT THERE WAS NO IMMEDIATE REPORTS OF CASUALTIES, REPORTED DPA. THE EPICENTRE OF THE QUAKE, WHICH STRUCK ABOUT 3:40 P.M. (0740 GMT), WAS 82.1 KILOMETRES OFF ILAN ON THE NORTH-EASTERN COAST AND FIVE KILOMETRES UNDER THE SEA, THE SEISMOLOGICAL OBSERVATION CENTRE SAID. THE QUAKE WAS FELT THROUGHOUT TAIWAN. IN TAIPEI, TALL BUILDINGS SWAYED, AND SOME OFFICE WORKERS AND RESIDENTS RAN INTO THE STREET.