Understanding interactions among different natural hazards is taking a great relevance to evaluate the risk posed by natural events. The development of multi-hazard approaches is widely encouraged in key government and intergovernmental initiatives and agencies and further investigations are mandatory. The identification of all possible and spatially related hazards is important in a full multi-hazard analysis. Triggering factors represents a key point towards the definition of a multi-hazard and consequently a multi-risk assessment. Here we consider the case of earthquake and landslide interaction. Seismic sequences and earthquakes, not necessarily of medium-high magnitudes, could trigger other hazardous events and produce destructive ground effects. One of the potential consequences of the seismicity is the modification of the slope stability that favours the occurrence of multiple landslides caused by other different triggering factors, such as the meteorological events. For the purpose we present a preliminary analysis of the landslides induced by both seismic activity and meteorological conditions in the Emilia Romagna region. The scope of the study is the investigations of the shaking effects on the slope failures, concomitant or not with long lasting rainfalls or snow melt or other intense meteorological conditions, both in the short- and long-term. We examined more than 800 landslide records selected from a digital archive of landslide events occurred in the period from February 2007 to March 2018. The investigation time window was chosen to include the 20th May 2012 earthquake (Terremoto Emilia, magnitude 5.9). In the correspondent decade we extracted the daily precipitation data from the National Oceanic and Atmospheric Administration (NOAA) to evaluate the general trend of the precipitation intensity in the area. For the same period and for the two antecedent years we selected the magnitudes and the locations of the earthquakes from the Italian Seismological Instrumental and Parametric Data-Base (ISIDE) to analyse the seismic events and sequences occurred in the study region.
Seismic- and Meteo-induced Landslides in Emilia Romagna
Ardizzone Francesca;Bucci Francesco;Guzzetti Fausto;
2019
Abstract
Understanding interactions among different natural hazards is taking a great relevance to evaluate the risk posed by natural events. The development of multi-hazard approaches is widely encouraged in key government and intergovernmental initiatives and agencies and further investigations are mandatory. The identification of all possible and spatially related hazards is important in a full multi-hazard analysis. Triggering factors represents a key point towards the definition of a multi-hazard and consequently a multi-risk assessment. Here we consider the case of earthquake and landslide interaction. Seismic sequences and earthquakes, not necessarily of medium-high magnitudes, could trigger other hazardous events and produce destructive ground effects. One of the potential consequences of the seismicity is the modification of the slope stability that favours the occurrence of multiple landslides caused by other different triggering factors, such as the meteorological events. For the purpose we present a preliminary analysis of the landslides induced by both seismic activity and meteorological conditions in the Emilia Romagna region. The scope of the study is the investigations of the shaking effects on the slope failures, concomitant or not with long lasting rainfalls or snow melt or other intense meteorological conditions, both in the short- and long-term. We examined more than 800 landslide records selected from a digital archive of landslide events occurred in the period from February 2007 to March 2018. The investigation time window was chosen to include the 20th May 2012 earthquake (Terremoto Emilia, magnitude 5.9). In the correspondent decade we extracted the daily precipitation data from the National Oceanic and Atmospheric Administration (NOAA) to evaluate the general trend of the precipitation intensity in the area. For the same period and for the two antecedent years we selected the magnitudes and the locations of the earthquakes from the Italian Seismological Instrumental and Parametric Data-Base (ISIDE) to analyse the seismic events and sequences occurred in the study region.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
