On 26 September 1997 a sequence of seismic events began in Central Italy at the boundary between Umbria and Marche regions. Despite the moderate magnitude of the three main-shocks (respectively Ms 5.5, 5.9 and 5.5), extensive damage was induced and 232 ground effects were recorded. Slope movements, ground cracks and sliding along faults were observed and mapped, their areal distribution resulting consistent with the assumed fault rupture zone. It was inferred from the acquired seismological information and it trends NNW-SSE along a band 40 km long. Among slope movements, falls, topples, slides and earthflows were observed. More than 50% were fails that often involved large blocks (up to 800 m(3)) and usually occurred in co-seismic conditions. Few cases were recorded some days after each main shock. Distribution, total number and type of the observed movements is in accordance with literature data regarding earthquakes of comparable magnitude.
Ground effects induced by the Umbria-Marche earthquakes of September-October 1997, Central Italy / Bozzano, Francesca; P., Gambino; Prestininzi, Alberto; SCARASCIA MUGNOZZA, Gabriele; Valentini, Giovanni. - STAMPA. - 2:(1998), pp. 825-830. (Intervento presentato al convegno 8th International Congress of the International-Association-for-Engineering-Geology-and-the-Environment tenutosi a VANCOUVER, CANADA nel SEP 21-25, 1998).
Ground effects induced by the Umbria-Marche earthquakes of September-October 1997, Central Italy
BOZZANO, Francesca;PRESTININZI, ALBERTO;SCARASCIA MUGNOZZA, Gabriele;VALENTINI, Giovanni
1998
Abstract
On 26 September 1997 a sequence of seismic events began in Central Italy at the boundary between Umbria and Marche regions. Despite the moderate magnitude of the three main-shocks (respectively Ms 5.5, 5.9 and 5.5), extensive damage was induced and 232 ground effects were recorded. Slope movements, ground cracks and sliding along faults were observed and mapped, their areal distribution resulting consistent with the assumed fault rupture zone. It was inferred from the acquired seismological information and it trends NNW-SSE along a band 40 km long. Among slope movements, falls, topples, slides and earthflows were observed. More than 50% were fails that often involved large blocks (up to 800 m(3)) and usually occurred in co-seismic conditions. Few cases were recorded some days after each main shock. Distribution, total number and type of the observed movements is in accordance with literature data regarding earthquakes of comparable magnitude.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
