Constraints on the viscosity of the continental crust and mantle from GPS measurements and postseismic deformation models in western Mongolia

Vergnolle, Mathilde; Pollitz, Fred F.; Calais, E.

doi:10.1029/2002jb002374

Cited by 79 publications

(75 citation statements)

References 71 publications

(140 reference statements)

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“…This conclusion is in agreement with Maggi et al (2000). (Barbot et al, 2008;Pollitz, 2003;Vergnolle et al, 2003). Vergnolle et al (2003) 19 Pa s. This viscosity is also consistent with other strike-slip fault studies in Tibet Plateau.…”

Section: Seismogenic Thickness and Effective Elastic Thickness In Gobsupporting

confidence: 82%

“…(Barbot et al, 2008;Pollitz, 2003;Vergnolle et al, 2003). Vergnolle et al (2003) 19 Pa s. This viscosity is also consistent with other strike-slip fault studies in Tibet Plateau. For example, Ryder et al (2014) 18 Pa s on Central Nevada Seismic Belt.…”

Section: Seismogenic Thickness and Effective Elastic Thickness In Gobsupporting

confidence: 79%

“…In this study, the InSAR rate map (from 1995 to 2010) rule out the afterslip still occurs on Gobi-Altai fault due to the time scale. Vergnolle et al (2003) determined the shear zone velocity associated with the low-viscosity model (3 to 5.5 mm/yr), and it is more consistent with the accumulated slip rate on active faults in Mongolia (Ritz et al, 1995(Ritz et al, , 2003. The amplitude of the line of sight velocities measured right across the Gobi-Altai fault is ~6 mm/yr, equivalent to a left-lateral rate of 15.35 mm/yr.…”

Section: Analysis Of Viscoelastic Relaxationmentioning

confidence: 62%

“…They believe that the observed deformation is not able to explain by linear viscoelastic relaxation in the upper mantle or lower crust, constraining the dynamic viscosity of the lower crust to be > 10 19 Pa s (Barbot et al, 2008). Vergnolle et al (2003) also use GPS measurements to determine the viscosity of the lower crust and upper mantle. They established a viscoelastic two-layer model on a spherical Earth, with the upper layer representing the upper crust and with the lower layer depicting the lower crust and upper mantle.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Lithospheric Structure in Mongolia: Insights From Insar Observations and Modelling

Zhang

Bihong

Pilong

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The western Mongolia is a seismically active intracontinental region, with ongoing tectonic deformation and widespread seismicity related to the far-field effects of India-Eurasia collision. During the 20th century, four earthquakes with the magnitude larger than 8 occurred in the western Mongolia and its surrounding regions, providing a unique opportunity to study the geodynamics of intracontinental tectonic deformations. The 1957 magnitude 8.3 Gobi-Altai earthquake is one of the largest seismic events. The deformation pattern of rupture zone associated with this earthquake is complex, involving left-lateral strike-slip and reverse dip-slip faulting on several distinct geological structures in a 264 × 40 km wide zone. To understand the relationship between the observed postseismic surface deformation and the rheological structure of the upper lithosphere, Interferometric Synthetic Aperture Radar (InSAR) data are used to study the 1957 earthquake. Then we developed a postseismic model in a spherical, radially layered elasticviscoelastic Earth based on InSAR results, and further analysed the dominant contribution to the surface deformation. This work is important for understanding not only the regional tectonics, but also the structure and dynamics of the lithosphere. SAR data were acquired from the ERS1/2 and Envisat from 1996 to 2010. Using the Repeat Orbit Interferometry Package (ROI_PAC), 124 postseismic interferograms are produced on four adjacent tracks. By stacking these interferograms, the maximum InSAR line-of-sight deformation rate along the Gobi-Altai fault zone is obtained. The main results are as follows: (1) The maximum InSAR line-of-sight deformation velocity along this large fault zone is about 6 mm/yr; (2) The modelled surface deformation suggests that the viscoelastic relaxation is the most reasonable mechanism to explain the observed surface motion; (3) The optimal model cover the Gobi-Altai seismogenic thickness is 10 km; (4) The lower bound of Maxwell viscosity of lower crust and upper mantle is approximately 9 ×1019 Pa s, and the Maxwell relaxation time corresponding to this viscosity is 95.13 years.

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Section: Seismogenic Thickness and Effective Elastic Thickness In Gobsupporting

confidence: 82%

Section: Seismogenic Thickness and Effective Elastic Thickness In Gobsupporting

confidence: 79%

Section: Analysis Of Viscoelastic Relaxationmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Lithospheric Structure in Mongolia: Insights From Insar Observations and Modelling

Zhang

Bihong

Pilong

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…1a). Considering the high rate of large earthquakes between 1905 and 1957, these earthquakes have been described as a seismic cluster involving mechanical coupling between faults (Chéry et al, 2001;Pollitz et al, 2003;Vergnolle et al, 2003). These earthquakes occurred along strike-slip faults that are several hundred kilometers long (i.e., Tsetserleg, Bolnay, Fuyun, and Bogd faults) and accommodate the northernmost deformation related to the India-Asia collision (Florensov and Solonenko, 1965;Molnar and Tapponnier, 1977;Tapponnier and Molnar, 1979;Cunningham, 1998).…”

Section: Introduction and Tectonic Settingmentioning

confidence: 99%

Earthquake Geology of the Bulnay Fault (Mongolia)

Rizza¹,

Ritz²,

Prentice³

et al. 2015

Bulletin of the Seismological Society of America

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Omori‐like decay of postseismic velocities following continental earthquakes

Ingleby

Wright

2017

Geophysical Research Letters

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Various mechanisms have been proposed to explain the transient, enhanced surface deformation rates following earthquakes. Unfortunately, these different mechanisms can produce very similar surface deformation patterns leading to difficulty in distinguishing between them. Here we return to the observations themselves and compile near‐field postseismic velocity measurements following moderate to large continental earthquakes. We find that these velocities have a remarkably consistent pattern, with velocity inversely proportional to time since the earthquake. This suggests that postseismic velocities show an Omori‐like decay and that postseismic displacements increase logarithmically over time. These observations are inconsistent with simple, linear Maxwell or Burgers body viscoelastic relaxation mechanisms but are consistent with rate‐and‐state frictional afterslip models and power law shear zone models. The results imply that near‐field postseismic surface deformation measurements are primarily the result of fault zone processes and, therefore, that the inference of lower crustal viscosities from near‐field postseismic deformation requires care.

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Constraints on the viscosity of the continental crust and mantle from GPS measurements and postseismic deformation models in western Mongolia

Cited by 79 publications

References 71 publications

Investigation of Lithospheric Structure in Mongolia: Insights From Insar Observations and Modelling

Investigation of Lithospheric Structure in Mongolia: Insights From Insar Observations and Modelling

Earthquake Geology of the Bulnay Fault (Mongolia)

Omori‐like decay of postseismic velocities following continental earthquakes

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