Measurement of interseismic strain across the Haiyuan fault (Gansu, China), by InSAR

Cavalié, Olivier; Lasserre, Cécile; Doin, Marie‐Pierre; Peltzer, G.; Sun, Jianbao; Xu, Xiwei; Shen, Zheng‐Kang

doi:10.1016/j.epsl.2008.07.057

Cited by 180 publications

(218 citation statements)

References 40 publications

Supporting

Mentioning

131

Contrasting

Order By: Relevance

“…The current slip rate as estimated geodetically is 4-8 mm a À1 (Cavalie et al 2008) based upon InSAR observations and is in near agreement with that derived from GPS observations of 8.6 mm a À1 (Gan et al 2007). Microplate models for Tibet from Meade (2007) and Thatcher (2007) estimated fault slip rates of 9 mm a À1 and 6 mm a À1 respectively.…”

Section: Haiyuan Faultsupporting

confidence: 67%

Crustal–lithospheric structure and continental extrusion of Tibet

Searle

Elliott

Phillips

et al. 2011

JGS

237

154

View full text Add to dashboard Cite

Crustal shortening and thickening to c. 70-85 km in the Tibetan Plateau occurred both before and mainly after the c. 50 Ma India-Asia collision. Potassic-ultrapotassic shoshonitic and adakitic lavas erupted across the Qiangtang (c. 50-29 Ma) and Lhasa blocks (c. 30-10 Ma) indicate a hot mantle, thick crust and eclogitic root during that period. The progressive northward underthrusting of cold, Indian mantle lithosphere since collision shut off the source in the Lhasa block at c. 10 Ma. Late Miocene-Pleistocene shoshonitic volcanic rocks in northern Tibet require hot mantle. We review the major tectonic processes proposed for Tibet including 'rigid-block', continuum and crustal flow as well as the geological history of the major strikeslip faults. We examine controversies concerning the cumulative geological offsets and the discrepancies between geological, Quaternary and geodetic slip rates. Low present-day slip rates measured from global positioning system and InSAR along the Karakoram and Altyn Tagh Faults in addition to slow long-term geological rates can only account for limited eastward extrusion of Tibet since Mid-Miocene time. We conclude that despite being prominent geomorphological features sometimes with wide mylonite zones, the faults cut earlier formed metamorphic and igneous rocks and show limited offsets. Concentrated strain at the surface is dissipated deeper into wide ductile shear zones.

show abstract

Section: Haiyuan Faultsupporting

confidence: 67%

Crustal–lithospheric structure and continental extrusion of Tibet

Searle

Elliott

Phillips

et al. 2011

JGS

237

154

View full text Add to dashboard Cite

show abstract

“…[14] Following Cavalié et al [2008], we express the differential interferometric phase at pixel p of interferogram i, f ip , as a sum of four terms:…”

Section: Orbital Error Correctionmentioning

confidence: 99%

Rising of the lowest place on Earth due to Dead Sea water‐level drop: Evidence from SAR interferometry and GPS

Nof¹,

Ziv²,

Doin³

et al. 2012

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

[1] The Dead Sea water-level has been dropping at an exceedingly increasing rate since 1960, and between 1993 and 2001, the interval of the InSAR data examined in this study, it has dropped at an average rate of 0.88 m per year. Such a water-level change could potentially give rise to a resolvable lithospheric rebound and regional uplift, with spatial extent and amplitude that are controlled by the effective mechanical properties of the crust and upper mantle combined. We measure that deformation for the years 1993 to 2001, using 149 short baseline interferograms made of 31 ERS-1 and ERS-2 Synthetic Aperture Radar (SAR) images and continuous GPS data from the Survey of Israel recorded between 1997 and 2011. The uplift rate at the Dead Sea is small (up to 4 mm/year), and the basin topography is almost a mirror of the displacement, introducing a strong trade-off between uplift and stratified atmosphere noise. To overcome this complication, we impose a linearity constraint on the satellite to ground Line Of Sight (LOS) phase changes based on the steady uplift observed by a continuous GPS station in the area of interest, and simultaneously solve for the LOS change rate, Digital Elevation Model (DEM) errors and the elevation-phase correlation. While the LOS rate and DEM errors are solved for each pixel independently, the elevation-phase correlation is solved for each SAR acquisition independently. Using this approach we separated the stratified atmospheric delay from the ground displacement. We observed a regional uplift around the Dead Sea northern basin, with maximum uplift close to the shorelines, and diminishing to zero by the Mediterranean coast. We modeled the effect of water load changes using a homogeneous elastic half-space, and found a good agreement between modeled and observed ground displacements using elastic properties that are compatible with seismic and gravity data down to a depth of 15 km below the Dead Sea basin, suggesting that the response of the crust to the sea level drop is controlled mainly by the elastic properties of the upper-crust immediately below the Dead Sea basin.

show abstract

“…[58] Cavalié et al [2008] use interferometric synthetic aperture radar data from descending orbits of the ERS satellites, acquired between 1993 and 1998 along two adjacent tracks covering the gap, to measure the current surface movements along the western Haiyuan fault. Velocity maps from both tracks show a zone of high-velocity gradient across the fault, a few kilometers wide, consistent with left-lateral slip on the Haiyuan fault.…”

Section: Comparison With Gps Interferometric Aperture Radar and Palmentioning

confidence: 99%

Late Quaternary left‐lateral slip rate of the Haiyuan fault, northeastern margin of the Tibetan Plateau

et al. 2009

View full text Add to dashboard Cite

Slip rates of major active strike‐slip faults within and around the Tibetan Plateau provide constraints for understanding the dynamics of continental deformation in general because large slip rates can be taken to imply localized deformation between rigid blocks and low slip rates on faults are more consistent with distributed deformation. Several major strike‐slip faults have been studied during the last 3 decades. As one of important active strike‐slip faults in and around the Tibetan Plateau, the slip rate of the Haiyuan fault has been discrepantly estimated to be high by proponents of “escape tectonics” or low by others and GPS observations. To better constrain its slip rate and then to better understand the mechanics of intracontinental deformation, we try to more carefully consider offset geomorphic features and age constraints along the Haiyuan fault. In this paper, we select three sites where both upper and lower bounds of slip rate can be obtained. We find that slip rates are 4.2 ± 0.8 mm/yr at the Shaomayin, 4.5 ± 0.7 mm/yr at Gaowanzi, and 5.0 ± 2.5 mm/yr at Huangliangtan site. Combinations of these rates with those published previously yield an average slip rate of 4.5 ± 1.0 mm/yr on the Haiyuan fault. This rate agrees with the present‐day slip rate of 4.3 ± 1.5 mm/yr measured by GPS, 4.2–8 mm/yr by interferometric synthetic aperture radar, and ∼5 mm/yr through paleoseismological studies. The temporal consistency suggests a steady state process of strain accumulation and release along the Haiyuan fault. The low slip rate suggests that the Haiyuan fault, similar to the Altyn Tagh fault, does not transfer a significant portion of the convergence between India and Asia out of India's path into Eurasia but merely redistributes crustal thickening.

show abstract

Measurement of interseismic strain across the Haiyuan fault (Gansu, China), by InSAR

Cited by 180 publications

References 40 publications

Crustal–lithospheric structure and continental extrusion of Tibet

Crustal–lithospheric structure and continental extrusion of Tibet

Rising of the lowest place on Earth due to Dead Sea water‐level drop: Evidence from SAR interferometry and GPS

Late Quaternary left‐lateral slip rate of the Haiyuan fault, northeastern margin of the Tibetan Plateau

Contact Info

Product

Resources

About