Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212310l&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 12, CiteID L12310
Physics
1
Geodesy And Gravity: Tectonic Deformation (6924), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Tectonophysics: Dynamics: Seismotectonics, Tectonophysics: Stresses: Crust And Lithosphere, Geographic Location: Asia
Scientific paper
The north China block (NCB), part of the Sino-Korean craton, is surprisingly one of the most active seismic regions in the world. The south China block (SCB), another major craton in East Asia, has been seismically quiescent. Using the updated GPS data and finite element modeling, we show that the kinematic boundary conditions are the primary cause of the contrasting seismicity. The SCB, facilitated by large strike-slip faults on its boundaries, moves coherently as a rigid block. Conversely, sandwiched between the expanding Tibetan plateau and the stable Siberia, the NCB experiences large differential stresses, which are further enhanced by faulting and thermal thinning of the lithosphere. The spatial agreement between seismic energy release in the past ~2000 years and the predicted long-term strain energy implies that intense seismicity in the NCB may continue in the future.
Liu Mian
Yang Youqing
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