Earth surface deformation analysis of 2005 Qeshm earthquake based on three-dimensional displacement field derived from radar imagery measurements

Amighpey, Masoome; Vosooghi, Behzad; Dehghani, Maryam

doi:10.1016/j.jag.2009.01.002

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…The spatially continuous 3-D coseismic surface deformation field also provides us an opportunity to investigate the strain of the Tohoku-Oki earthquake, with the characteristics of high spatial resolution and three-dimensionality. In this paper, we estimated three strain invariants, that is, dilatation, differential rotation magnitude and maximum shear strain (Vanicek et al 2008), for each pixel in the derived 3-D displacement field by using a modified WLS inversion (Amighpey et al 2009;Guglielmino et al 2011). As shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The location of the differential rotation magnitude and maximum shear strain conforms to the great contractions in the centre of the Honshu Island. The concentration of the three strain invariants can be used as a useful indication of blind faults (Amighpey et al 2009). Although more work is needed to refine the strain analysis results, it is revealed by the derived strain invariants that the Honshu Island suffered from an evident dilatation and shear during the seismic event.…”

Section: Discussionmentioning

confidence: 99%

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Derivation of 3-D coseismic surface displacement fields for the 2011 Mw 9.0 Tohoku-Oki earthquake from InSAR and GPS measurements

Ding

et al. 2012

Geophysical Journal International

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Interferometric synthetic aperture radar (InSAR) and global positioning system (GPS) have obvious deficiencies for monitoring surface deformations, for example, 1-D line-of-sight (LOS) measurements for InSAR and spatially very sparse observations for GPS. In this paper, InSAR and GPS measurements are integrated to derive spatially high-resolution 3-D coseismic surface displacement fields of the 2011 M w 9.0 Tohoku-Oki, Japan earthquake. A unified simultaneous least squares (USLS) approach is developed to minimize the inconsistence between the InSAR results from adjacent paths. 3-D ground displacements are then derived by integrating the InSAR and the GPS measurements with the method of weighted least squares (WLS). Comparisons with independent GPS measurements show that the root mean square errors (RMSEs) of the derived 3-D displacements are 6.30, 4.57 and 1.29 cm for the vertical, east and north components, respectively. The 3-D coseismic displacement map shows that the Honshu Island moved eastwards towards the epicentre and subsided in the eastern part. The maximal displacements in the vertical, east and north directions are −1.5, 5.0 and −2.0 m, respectively. The effects of the density of GPS sites on the InSAR/GPS integration are also investigated. The experimental results reveal that lower to 70 km spatial resolution's GPS observations are adequate to guarantee the accuracies of the 3-D displacements for the Tohoku-Oki earthquake. This demonstrates the applicability of the developed WLS-based InSAR/GPS integration method, as in general the GPS observations are not as dense as those in this study area. Based on the spatially high-resolution 3-D surface displacement fields, we estimate the high-resolution and 3-D strain of the Tohoku-Oki earthquake. The preliminary results show that the Honshu Island suffers from an evident dilatation and shear during the seismic event.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%