Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

The coastal M. Pacì rock-avalanche was triggered by the 6th February 1783 earthquake near the village of Scilla (southern Calabria) and involved a subaerial volume of about 5·106 m3. This landslide produced a tsunami wave responsible for more than 1500 human life losses near Marina Grande beach. A geological survey and a geomechanical characterization of both the intact rock and the jointed rock mass outcropping in the landslide slope were carried out to obtain an engineering-geology model of the landslide according to an equivalent-continuum approach. Dynamic numerical modelling by FDM code FLAC 6.0 was performed to back-analyse the landslide occurrence during the 1783 seismic sequence. At this aim reference synthetic accelerometric ground motions were derived from strong motion records, taking into account both source and energy features of the 5th and 6th February mainshocks and local expected response spectra. In order to force the numerical model, levelled-energy multifrequencial equivalent signals were obtained from these reference records by experiencing the new LEMA_DES approach. The results of modelling show a post-seismic trigger of the rock-avalanche, related to the second mainshock of the 1783 seismic sequence, and are in good agreement with the present-day field evidences of the landslide scar area. In addition, no landslide results by assuming the present shape of the M. Pacì slope if an equivalent input generated for the 1908 Reggio and Messina earthquake is applied.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

COinS
 
May 24th, 12:00 AM May 29th, 12:00 AM

Numerical Modelling of Earthquake-Induced Rock Landslides: The 1783 Scilla Case-History (Southern Italy)

San Diego, California

The coastal M. Pacì rock-avalanche was triggered by the 6th February 1783 earthquake near the village of Scilla (southern Calabria) and involved a subaerial volume of about 5·106 m3. This landslide produced a tsunami wave responsible for more than 1500 human life losses near Marina Grande beach. A geological survey and a geomechanical characterization of both the intact rock and the jointed rock mass outcropping in the landslide slope were carried out to obtain an engineering-geology model of the landslide according to an equivalent-continuum approach. Dynamic numerical modelling by FDM code FLAC 6.0 was performed to back-analyse the landslide occurrence during the 1783 seismic sequence. At this aim reference synthetic accelerometric ground motions were derived from strong motion records, taking into account both source and energy features of the 5th and 6th February mainshocks and local expected response spectra. In order to force the numerical model, levelled-energy multifrequencial equivalent signals were obtained from these reference records by experiencing the new LEMA_DES approach. The results of modelling show a post-seismic trigger of the rock-avalanche, related to the second mainshock of the 1783 seismic sequence, and are in good agreement with the present-day field evidences of the landslide scar area. In addition, no landslide results by assuming the present shape of the M. Pacì slope if an equivalent input generated for the 1908 Reggio and Messina earthquake is applied.