The last eruption occurred during the 17th century. Click on the index link or scroll down to read the reports. All information contained in these reports is preliminary and subject to change. The M 2.7 shock, on 12 October at 0124, had an S-P of 1.5 seconds, consistent with a depth of 8 km. No fumarolic activity was observed and crater morphology has remained unchanged since the team's initial observation in 1989.
Geologists plan a continued monitoring program.
Low seismicity, no fumarolic activity, and no crater changes Seismic activity was monitored on 22-24 April using one station located at 4,480 m elevation on the S flank. The station registered five B-type events within a 5.5 hour time period on 23 April, and three events within 15 minutes of each other on 24 April. Observers who ascended to the summit found no fumarolic activity. Crater morphology was unchanged since visits in October 1992 and 1989.