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Lithospheric deformation of the Nuomin River volcano in Northeast China:Evidence from shear wave splitting

QIANG ZhengYang;WU QingJu;Institute of Geophysics,Chinese Earthquake Administration;Key laboratory of Seismic Observation and Geophysical Imaging,Institute of Geophysics,China Earthquake Administration;  
Cenozoic intraplate volcanoes are widely present in Northeast China,among which the Nuomin River volcano′s causative mechanism is poorly understood due to the lack of detailed constraints on the upper mantle structure beneath this region.A total of 82 pairs of shear wave splitting measurements and 219 null measurements are obtained at 40 temporary seismic stations.These data suggest that delay times vary from 0.4 sto 1.4 swith an average value of 0.78±0.21 s;while fast directions trending N77°W to N18°E with a mean value of N6.9°W±9.87°at most of stations.Fossil anisotropy within lithosphere is considered to be the main origin of anisotropy since the fast directions are in line with extensional orientation of the Late Mesozoic lithosphere in this area.Meanwhile,solely null measurements are measured at 19 stations,implying possible lithospheric thermal erosion by hot mantle upwelling.
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