HR: 0830h
AN: S51D-0078    [PDF]
TI: The 2002/12/30 Stromboli volcano landslides: a seismological description
AU: * Pino, N
EM: pino@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologi, Via di Vigna Murata, 605, Roma, 00143 Italy
AU: Ripepe, M
EM: ripepe@ingv.it
AF: Dipartimento di Scienze della Terra, Universita' di Firenze, Via Giorgio La Pira, 4, Firenze, 50121 Italy
AU: Cimini, G B
EM: cimini@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologi, Via di Vigna Murata, 605, Roma, 00143 Italy
AB: We analyse the seismograms of the slump episodes occurred at Stromboli on December 30, 2002. By using a simple single force model, generally adopted for landslides, we estimate the volume involved in the single subevents and attempt at a chronological reconstruction of the whole process. Our results indicate the occurrence of two main events at 12:15:08 and 12:22:45 UT, respectively. These could be interpreted as a first submarine slump, causing the observed tsunami, and a second one above the sea level, not producing destructive sea waves. A total volume of about $20\times10^6 m^3$ results for the submarine event, which developed in about 2 minutes with several distinct detachments, the first and largest one displacing a volume of $10.8\times10^6 m^3$. The second, subaerial, mass sliding sequence interested $2.5\times10^6 m^3$ at minimum, in about 90 s. These estimates are in good agreement with independent results from bathymetric and topographic surveys. A large long period pulse is also recognizable in the seismograms of the Stromboli station. We tentatively interpret this feature as corresponding to the tilt caused by the water load associated with the ingression in the Ficogrande area, in the northeastern side, close to the recording site.
DE: 7200 SEISMOLOGY
DE: 8010 Fractures and faults
DE: 8404 Ash deposits
SC: Seismology [S]
MN: 2003 Fall Meeting