Mathematics – Logic
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.163..339z&link_type=abstract
Geophysical Journal International, Volume 163, Issue 1, pp. 339-356.
Mathematics
Logic
3
Scientific paper
The 3-D rheological structure of the lithosphere in the Ordos block and its adjacent area (32°-43°N, 102°-116°E) is obtained using iterative and averaging methods, based on the seismic velocity structure, thermal structure and composition of the lithosphere. The thermal structure is obtained from the newly published surface heat flow data sets. The brittle fracture mechanism is taken into account when the rheological structure is calculated. The strain rate obtained from GPS observation in the area under study is used to calculate the strength and the viscosity of the lithosphere. The results show that there are low-viscosity layers at the bottom of the upper crust, the lower crust and the bottom of the lithosphere both under the Ordos block and its adjacent regions, and the viscosity varies horizontally. The viscosity in grabens surrounding the Ordos block is one to two orders of magnitude lower than that in the Ordos block. The results also show that the rheological structure coincides with the major geological structure, below the major fault systems the viscosity is relatively low. The earthquakes with Ms>= 4.0 occurred along the large active faults. Most of the hypocentres of the earthquakes are in the upper and middle crust with high viscosity. The maximum depth of the earthquake is above the viscosity contour line of 1022Pas. Numerical studies show that the active geological structures must be taken into account when the 3-D rheological structure is used for geodynamics study.
Liu Yong Gang
Qiang Wei Rong
Zang Shao Xian
No associations
LandOfFree
Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1625499