ISSN:
1420-9136
Keywords:
Volcanic earthquakes
;
statistical analysis
;
Mt. Etna
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract Seismic activity that preceded, accompanied, and followed the 17–23 March 1981 Etnean eruption has been statistically analyzed. On the grounds of both time evolution of seismicity and catalogue completeness, three time intervals have been defined (12 February–2 March, 12–17 March, 19–31 March) and for each of these periods both the “b” coefficient of theGutenberg-Richter's (1956) relationship and the “E” parameter of the cluster size (Shlien andToksoz, 1970) have been calculated. No significant variations were observed between the first and third periods, while lower values of bothb andE coefficients were found in the second one. These findings might indicate that changes in the seismicity features occur just before the eruption start. Small but fast variations in the stress field acting on the volcano might originate this type of seismic activity, while the importance of the tectonic control on volcanic phenomena seems to be confirmed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00878403
