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We present and interpret the observations of extreme ultraviolet (EUV) wavesassociated with a filament eruption on 2011 May 11.The filament eruption alsoproduces a small B-class two ribbon flare and a coronal mass ejection (CME).The event is observed by the Solar Dynamic Observatory (SDO) with highspatio-temporal resolution data recorded by Atmospheric Imaging Assembly (AIA).As the filament erupts, we observe two types of EUV waves (slow and fast)propagating outwards. The faster EUV wave has a propagation velocity of ~ 500km/s and the slower EUV wave has an initial velocity of ~ 120 km/s. We reportfor the first time that not only the slower EUV wave stops at a magneticseparatrix to form bright stationary fronts, but also the faster EUV wavetransits a magnetic separatrix, leaving another stationary EUV front behind.

Peculiar Stationary EUV Wave Fronts in the eruption on 2011 May 11