摘要
The shear-wave splitting was analyzed on the deep seismic sounding profile crossing the Dabieshan area. The direction difference between Sg and SmS fast wave polarization indicates that the modern regional tectonic stress field in the Dabieshan area exists only in upper crust, while the crack alignment caused by the Triassic collision between the North China and the Yangtze blocks had been preserved in mid-lower curst.
The shear-wave splitting was analyzed on the deep seismic sounding profile crossing the Dabieshan area. The direction difference between Sg and SmS fast wave polarization indicates that the modem regional tectonic stress field in the Dabieshan area exists only in uppcr crust, while the crack alignment caused by the Triassic collision between the North China and the Yangtze blocks had been preserved in mid-lower curst.
基金
ThisworkwasjointlysupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .493742 0 8)andtheJointEarthquakeScienceFoundation (GrantNo .9940 31)
