Smithsonian Institution Global Volcanism Network Bulletin v. 20, no. 1, January 1995 Aoba (Vanuatu) Volcanic seismicity felt during 1-7 December Aoba (Ambae) Ambae Island, Vanuatu 15.40 S, 167.83 E; summit elev. 1,496 m Unusual seismicity was felt by island residents during 1-7 December 1994, with a maximum of 7 small-to-medium events on the 5th. These volcanic events were of high-frequency and lacked individualized phases. At the suggestion of ORSTOM, the National Disaster Management Office organized a helicopter reconnaissance on 7 December to inspect the volcano for evidence of possible eruptive activity. Activity at the Lake Vui crater and the fumarolic area on the shore of Lake Manoro was similar to that observed during previous aerial observations on 24 July 1991 and September 1993. Small areas of hot and gaseous water were evident at Lake Vui, and the rainforest was completely burned around the crater. No large bubbles like those noted in July 1991 (10 m in diameter) were observed (Bulletin v. 16, no. 7). An automated seismic alert station, with satellite transmission to Port Vila, will be installed near Lake Vui. Aoba, also known as Ambae, is a broad basaltic shield volcano with pronounced NE-SW rift zones that give the island an elongated form. A broad pyroclastic cone containing a crater lake is located at the summit within the younger of two nested calderas, the largest of which is 6 km in diameter. The last known eruption, around 1870, produced lahars that destroyed villages on the SE flank. According to local legends, an eruption around 1670 caused many fatalities on the NW coast. Information Contact: Michel Monzier, Institut Francais de Recherche Scientifique pour le Developpement en Cooperation (ORSTOM) and Vanuatu Dept of Geology, Mines & Water Resources, BP 76, Port Vila, Vanuatu.