A two-dimensional MHD simulation is performed to investigate the evolution and the asymptotic quasi-static state (AQSS) of the vortex-induced tearing mode instability (VITM) at the magnetospheric boundary. The original VITM model is extended by including By, a magnetic field component along the invariant direction, and varying N, the number density, which makes the model applicable to a wide region on the dayside magnetopause. The AQSS is found to be characterized by a large-scale magnetic island together with a colocated vortex tube. The structure of the magnetic island is studied and compared with observations. The possible role of the VITM in the formation of flux transfer events is discussed. ¿American Geophysical Union 1990