The preliminary study of the tectonic activities along the boundary faults around the Minshan uplift, western Sichuan

As a segment of the eastern boundary of the Qinghai-Xizang Plateau, the Minshan uplift is characterized by severe tectonism and seismism, bounded by the Minjiang fault on the west and Huya fault on the east. The integration of GPS measurements and geological studies shows that the Minjiang and Huya faults are currently active. The former is a right-lateral strike-slip fault with a velocity of motion of more than 2 mm/a, while the latter also a right-lateral strike-slip fault with a velocity of motion of more than 2.55 mm/a. However the seismological observations are interpreted as a left-lateral strike-slip fault. The above-mentioned interpretations may be ascribed to the difference in time duration and position for GPS measurements, and architectures and geometry of fractured surfaces.