The 2010–2011 Canterbury, New Zealand, seismic sequence: Multiple source analysis from InSAR data and modeling

Atzori, Simone; Tolomei, Cristiano; Antonioli, Andrea; Boncori, John Peter Merryman; Bannister, Stephen; Trasatti, Elisa; Pasquali, Paolo; Salvi, Stefano

doi:10.1029/2012jb009178

Cited by 54 publications

(25 citation statements)

References 45 publications

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“…8b). This alignment compares very well to an area of SAR signal decorrelation, whose origin is likely due to co-seismic modifications of the surface scattering properties caused by the expulsion of ground waters as already observed by Atzori et al (2012) for the 2011 Christchurch earthquake in New Zealand. Along and close to the eastern section of this alignment, complex ground deformations occur, indicated by sharp bending (up to 90 • ) of the local fringe trends (white arrow in Fig.…”

Section: Discussionmentioning

confidence: 73%

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Alessio¹,

Alfonsi²,

Brunori³

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. In this paper we present the geological effects induced by the 2012 Emilia seismic sequence in the Po Plain. Extensive liquefaction phenomena were observed over an area of ~ 1200 km2 following the 20 May, ML 5.9 and 29 May, ML 5.8 mainshocks; both occurred on about E–W trending, S dipping blind thrust faults. We collected the coseismic geological evidence through field and aerial surveys, reports from local people and Web-based survey. On the basis of their morphologic and structural characteristics, we grouped the 1362 effects surveyed into three main categories: liquefaction (485), fractures with liquefaction (768), and fractures (109). We show that the quite uneven distribution of liquefaction effects, which appear concentrated and aligned, is mostly controlled by the presence of paleo-riverbeds, out-flow channels and fans of the main rivers crossing the area; these terrains are characterised by the pervasive presence of sandy layers in the uppermost 5 m, a local feature that, along with the presence of a high water table, greatly favours liquefaction. We also find that the maximum distance of observed liquefaction from the earthquake epicentre is ~ 30 km, in agreement with the regional empirical relations available for the Italian Peninsula. Finally, we observe that the contour of the liquefaction observations has an elongated shape almost coinciding with the aftershock area, the InSAR deformation area, and the I ≥ 6 EMS area. This observation confirms the control of the earthquake source on the liquefaction distribution, and provides useful hints in the characterisation of the seismogenic source responsible for historical and pre-historical liquefactions.

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Section: Discussionmentioning

confidence: 73%

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Alessio¹,

Alfonsi²,

Brunori³

et al. 2013

Nat. Hazards Earth Syst. Sci.

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“…Here, we successfully apply synthetic aperture radar (SAR) interferometry (In-SAR), derived from satellite data, to identify and map soil liquefaction. Satellite-based remote sensing methods hold promise for providing broad and dense information on the Earth's surface (Massonnet and Feigl, 1998;Bürgmann et al., 2000; Simons and Rosen, 2007) and have shown a potential advantage for investigating soil liquefaction (Atzori et al, 2012). To our knowledge, this study is the first application of InSAR analysis to mapping soil liquefaction caused by the 2011 Tohoku earthquake.…”

Section: Introductionmentioning

confidence: 98%

Detection and mapping of soil liquefaction in the 2011 Tohoku earthquake using SAR interferometry

2012

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We have identified areas of soil liquefaction by the analysis of surface changes caused by the 2011 Tohoku earthquake, using synthetic aperture radar (SAR) interferometry in the Kanto region of Japan. Changes in surface scattering properties were evaluated using phase-corrected coherence, computed from the reflective intensity (amplitude) of SAR data. Often, the loss of coherence (decorrelation) is simply considered to represent areas damaged from the disaster. However, temporal decorrelation could also be induced by ordinal surface cover change in addition to disaster damage. Therefore, we use a coherence change threshold to discriminate significant decorrelation caused by soil liquefaction from that produced by ordinal surface cover changes. Moreover, local surface displacements are estimated using phase information from the SAR data. Our results compare favorably with those from surveys of sand boils and aerial photography, showing that surface changes derived from SAR data are associated with soil liquefaction. Our results demonstrate that soil liquefaction occurred mainly near the waterfront along Tokyo Bay and the Tone River, and ground subsidence was widely distributed.

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“…Many phenomena can contribute to ground deformation after strong earthquakes, including the fault slip [10], the compaction induced by liquefaction [11,12], and the earthquake-triggered slope instabilities [13][14][15][16][17]. All these phenomena play different roles depending on the geological, geotechnical, and hydrogeological features of the epicentral area.…”

Section: Introductionmentioning

confidence: 99%

The Relationship between InSAR Coseismic Deformation and Earthquake-Induced Landslides Associated with the 2017 Mw 3.9 Ischia (Italy) Earthquake

et al. 2018

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We investigated the contribution of earthquake-induced surface movements to the ground displacements detected through Interferometric Synthetic Aperture Radar (InSAR) data, after the M w 3.9 Ischia earthquake on 21 August 2017. A permanent displacement approach, based on the limit equilibrium method, allowed estimation of the spatial extent of the earthquake-induced landslides and the associated probability of failure. The proposed procedure identified critical areas potentially affected by slope movements partially overlapping the coseismic ground displacement retrieved by InSAR data. Therefore, the observed ground displacement field is the combination of both fault slip and surficial sliding caused by the seismic shaking. These findings highlight the need to perform preliminary calculations to account for the non-tectonic contributions to ground displacements before any estimation of the earthquake source geometry and kinematics. Such information is fundamental to avoid both the incorrect definition of the source geometry and the possible overestimation of the coseismic slip over the causative fault. Moreover, knowledge of the areas potentially affected by slope movements could contribute to better management of a seismic emergency, especially in areas exposed to high seismic and hydrogeological risks.

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The 2010–2011 Canterbury, New Zealand, seismic sequence: Multiple source analysis from InSAR data and modeling

Cited by 54 publications

References 45 publications

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Detection and mapping of soil liquefaction in the 2011 Tohoku earthquake using SAR interferometry

The Relationship between InSAR Coseismic Deformation and Earthquake-Induced Landslides Associated with the 2017 Mw 3.9 Ischia (Italy) Earthquake

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