Report on Additional Reports (Unknown) — December 1988
Scientific Event Alert Network Bulletin, vol. 13, no. 12 (December 1988)
Managing Editor: Lindsay McClelland.
Additional Reports (Unknown) Azores-Gibraltar Fracture Zone: Continued earthquakes and tremor
Please cite this report as:
Global Volcanism Program, 1988. Report on Additional Reports (Unknown) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 13:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198812-600500
Lat Unknown, Unknown; summit elev. m
All times are local (unless otherwise noted)
As of 27 December, a total of 1,300 events had been registered since the activity began. Several patterns of epicentral migration had been noted along the Azores-Gibraltar Fracture Zone and the Congro regional fault. Volcanic tremor remained frequent. Fumarole temperatures were about 10°C higher than normal at Furnas Caldera on Sao Miguel Island. Its most recent eruption, in 1630, deposited tephra over most of the island and killed 191 people.
Geological Summary. Reports of floating pumice from an unknown source, hydroacoustic signals, or possible eruption plumes seen in satellite imagery.
Information Contacts: V. Forjaz, Univ of the Azores; NEIC; Lisbon International Service.