DOI: 10.1016/j.jag.2015.02.008
Scopus记录号: 2-s2.0-84943564279
论文题名: Coseismic liquefaction phenomenon analysis by COSMO-SkyMed: 2012 Emilia (Italy) earthquake
作者: Chini M ; , Albano M ; , Saroli M ; , Pulvirenti L ; , Moro M ; , Bignami C ; , Falcucci E ; , Gori S ; , Modoni G ; , Pierdicca N ; , Stramondo S
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2015
卷: 39 起始页码: 65
结束页码: 78
语种: 英语
Scopus关键词: coseismic process
; COSMO-SkyMed
; deformation
; earthquake event
; earthquake magnitude
; ground motion
; liquefaction
; subsidence
; synthetic aperture radar
; Emilia
英文摘要: 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. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79463
Appears in Collections: 气候变化事实与影响
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作者单位: Luxembourg Institute of Science and Technology (LIST), Department of Environmental Research and Innovation (ERIN), 41 rue du Brill, Belvaux, Luxembourg; University of Cassino and Southern Lazio, DiCEM - Department of Civil and Mechanical Engineering, Cassino, Italy; CIMA Research Foundation, Savona, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, 00143 Rome, Italy; Sapienza University of Rome, Department of Information Engineering, Electronics and Telecommunications, Rome, Italy
Recommended Citation:
Chini M,, Albano M,, Saroli M,et al. Coseismic liquefaction phenomenon analysis by COSMO-SkyMed: 2012 Emilia (Italy) earthquake[J]. International Journal of Applied Earth Observation and Geoinformation,2015-01-01,39