A strong earthquake rocked the north-eastern states at 6:06 A.M. on August 6, 1988. In northeast India it was felt strongly and some damages were reported. An isoseismal map has been prepared on the basis of the information obtained from the residents of the affected area through a questionnaire, damage survey and using peak ground accelerations at various sites. Maximum intensity VII was observed at Diphu, Lumding, Tejpur, Jamuguri, Raha and Kamargaon (Assam) etc. The station Berlongfer and Diphu had a highest and second highest acceleration (0.337g and 0.33ig respectively). The traditional and old construction without any earthquake resistance measures, suffered maximum damage. The maximum peak ground accelerations were recorded around Diphu. Damage survey also indicated maximum intensity in this area.