Siracusa province is prone to seismic risk. Many towns of the Siracusa province were destroyed by the 1693 earthquake; among these, the town of Noto was completely destroyed and rebuilt in a site some kilometres distant from the original one. To evaluate seismic risk at a specific area, it is important to have as much information as possible about many data related to the given area, but there are several problems with detection, collection, and use of spatial data/information for disaster management. Seismic hazard can be related with the consequences for exposed buildings and human life. GIS technologies could play a crucial role in analysing large areas, but a good geodatabase should be designed and populated with all the available data. The research that is being carried out has the aim to obtain an approach to detect seismic hazard factors and vulnerability elements of urban areas. To evaluate seismic vulnerability, a geo-database in terms of conceptual, logical and physical model to collect and store information about multy-risk analyses have been created to point out especially seismic risk evaluation. To evaluate seismic hazard, some scenario earthquake of a studied area should be applied to calculate the site seismic response. In this work the studied area is Siracusa, one of the most beautiful town in Sicily (Italy), with a baroque old town centre built after the great 1693 earthquake that destroyed eastern Sicily. The level 1 “scenario” earthquake is that of 1693 with its synthetic accelerogram, while level 2 “scenario” earthquake is the most significant shock which occurred during the 1990 Sicily earthquake, recorded on rock at the accelerometric station located in the town of Sortino, near Siracusa. Based on the site characterization of Siracusa area, the soil response is analysed. For each different zone and for the input motions considered as “scenario” earthquakes the response spectra at the surface level is developed. Some examples of site response evaluation of Siracusa area is shown in this paper. Finally, a seismic geotechnical hazard map in terms of maximum horizontal acceleration at the soil surface is drawn-up.
Geotechnical seismic hazard evaluation at Siracusa (Sicily) using GIS techniques
P. Capilleri
Writing – Original Draft Preparation
;
2012-01-01
Abstract
Siracusa province is prone to seismic risk. Many towns of the Siracusa province were destroyed by the 1693 earthquake; among these, the town of Noto was completely destroyed and rebuilt in a site some kilometres distant from the original one. To evaluate seismic risk at a specific area, it is important to have as much information as possible about many data related to the given area, but there are several problems with detection, collection, and use of spatial data/information for disaster management. Seismic hazard can be related with the consequences for exposed buildings and human life. GIS technologies could play a crucial role in analysing large areas, but a good geodatabase should be designed and populated with all the available data. The research that is being carried out has the aim to obtain an approach to detect seismic hazard factors and vulnerability elements of urban areas. To evaluate seismic vulnerability, a geo-database in terms of conceptual, logical and physical model to collect and store information about multy-risk analyses have been created to point out especially seismic risk evaluation. To evaluate seismic hazard, some scenario earthquake of a studied area should be applied to calculate the site seismic response. In this work the studied area is Siracusa, one of the most beautiful town in Sicily (Italy), with a baroque old town centre built after the great 1693 earthquake that destroyed eastern Sicily. The level 1 “scenario” earthquake is that of 1693 with its synthetic accelerogram, while level 2 “scenario” earthquake is the most significant shock which occurred during the 1990 Sicily earthquake, recorded on rock at the accelerometric station located in the town of Sortino, near Siracusa. Based on the site characterization of Siracusa area, the soil response is analysed. For each different zone and for the input motions considered as “scenario” earthquakes the response spectra at the surface level is developed. Some examples of site response evaluation of Siracusa area is shown in this paper. Finally, a seismic geotechnical hazard map in terms of maximum horizontal acceleration at the soil surface is drawn-up.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
