A study of the temporal sequence of aftershocks of the 1908 Messina earthquake

A. BOTTARI, D. CACCAMO

Abstract


The sequence of aftershocks in the great 1908 Messina earthquake
has beean analysed by following the Benioff method and applying Bath
and Duda's subsequent developments of it as well. The set of aftershocks,
915 on the whole, has a minimum intensity threshold of III MSC and includes
the activity in the same area of the great event (M 7.2) beginning
on the 28th December 1908 until June 1923. Three phases are identified:
the first two are connected with a extensive-type of creep recovery, the
last one is of shear-type. Subsequently the sequence-properties are interpreted
using the Omori coefficient (3 and the coefficient b of the Gutenberg
and Richter relation. Particularly, a quite distinct phase of activity
originating five months after the occurrence of the main shock has been
found.
The analysis proposed here is also compatible both with the focal
mechanism of events originating in the Strait of Messina and with the
regional tectonic framework.

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References


DOI: https://doi.org/10.4401/ag-4692
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X