Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30wsde7h&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 23, pp. SDE 7-1, CiteID 2213, DOI 10.1029/2003GL018764
Physics
2
Geodesy And Gravity: Crustal Movements-Intraplate (8110), Tectonophysics: Continental Neotectonics, Tectonophysics: Continental Tectonics-Extensional (0905), Tectonophysics: Dynamics, Gravity And Tectonics, Tectonophysics: Rheology-Crust And Lithosphere
Scientific paper
The Shanxi rift in northern China is marked by intensive seismicity, including many devastating historic earthquakes. Geological and seismological evidence show 0.5-1.6 mm/yr extension across the rift, and previous GPS results indicated an extension rate of 4 +/- 2 mm/yr. We show here newly compiled GPS data that indicate coherent crustal motion and no clear sign of extension across the rift. We reconcile the discrepancy between geological observations and GPS results in a simple viscoelastic finite element model with timescale-dependent crustal deformation. The GPS velocities can be fit by a model with a near elastic upper crust, consistent with predominantly interseismic deformation. The geological rate of extension is predicted when viscous creep of the crust is dominant, driven by the gravitational potential energy arising from the heterogeneity of crustal structure.
He Jiankun
Li Yanxing
Liu Mian
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