Generic selectors
Ricerca esatta
Cerca nel titolo
Cerca nel contenuto
Post Type Selectors
Eventi
Edifici
Allegati
Pagine
News
Atti Pubblici
Pubblicazioni
Soggetti
Home » Pubblicazioni » Coseismic liquefaction phenomena analysis by COSMO-SkyMed: 2012, Emilia (Italy) earthquake

Coseismic liquefaction phenomena analysis by COSMO-SkyMed: 2012, Emilia (Italy) earthquake

Descrizione

Abstract:

"The liquefaction phenomenon that occurred in the coseismic phase of the May 20, 2012 Emilia (Italy) earthquake (ML 5.9) is investigated. It was induced by the water pressure increase in the buried and confined sand layers. The level-ground liquefaction was the result of a chaotic ground oscillation caused by the earthquake shaking and the observed failures were due to the upward water flow caused by the excess of pore pressures. We exploited the capability of the differential synthetic aperture radar interferometry (DInSAR) technique to detect soil liquefactions and estimate their surface displacements, as well as the high sensitivity to surface changes of complex coherence, SAR backscattering and intensity correlation. To this aim, a set of four COSMO-SkyMed X-band SAR images, covering the period April 1–June 6, 2012, was used. Geological–geotechnical analysis was also performed in order to ascertain if the detected SAR-based surface effects could be due to the compaction induced by liquefaction of deep sandy layers. In this regards, the results obtained from 13 electrical cone penetrometer tests show the presence of a fine to medium sandy layer at depths, ranging between 9 and 13 m, which probably liquefied during the earthquake, inducing vertical displacements between 3 and 16 cm. The quantitative results from geological–geotechnical analysis and the surface punctual effects measured by DInSAR are in good agreement, even if some differences are present, probably ascribable to the local thickness and depth variability of the sandy layer, or to lack of deformation detection due to DInSAR decorrelation. The adopted approach permitted us to define the extent of the areas that underwent liquefaction and to quantify the local subsidence related to these phenomena. The latter achievement provides useful information that must be considered in engineering practices, in terms of expected vertical deformations."

Dettagli
INFO BIBILIOGRAFICHE
In "International Journal of Apllied Earth Observation and Geoinformation", 39, lug. 2015, pp. 1-14
Anno
2015
pubblicazione
collegamento esterno
Nessun allegato presente
Allegati
SISMA EMILIA 2012
DOCUMENTAZIONE SISMA EMILIA 2012
Portale di riferimento atto a svolgere funzione informativa e documentale.
ALTRI CONTATTI
Centro documentazione sisma 2012
Via Luosi 40 Mirandola, MO
Regione Emilia Romagna
Viale Aldo Moro ,52 40127 Bologna
Tutti i diritti riservati - 2019 - Sisma Emilia 2012 - Privacy Policy - Cookie Policy