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We present a multiwavelength study of the formation and ejection of a plasmablob and associated EUV waves in AR NOAA 11176, observed by SDO/AIA and STEREOon 25 March 2011. SDO/AIA images clearly show the formation and ejection of aplasma blob from the lower solar atmosphere at ~9 min prior to the onset of theM1.0 flare. This onset of the M-class flare happened at the site of the blobformation, while the blob was rising in a parabolic path with an average speedof ~300 km/s. The blob also showed twisting and de-twisting motion in the lowercorona, and the blob speed varied from ~10-540 km/s. The faster and slower EUVwavefronts were observed in front of the plasma blob during its impulsiveacceleration phase. The faster EUV wave propagated with a speed of ~785 to 1020km/s, whereas the slower wavefront speed varied in between ~245 and 465 km/s.The timing and speed of the faster wave match the shock speed estimated fromthe drift rate of the associated type II radio burst. The faster waveexperiences a reflection by the nearby AR NOAA 11177. In addition, secondarywaves were observed (only in the 171 \AA channel), when the primary fast waveand plasma blob impacted the funnel-shaped coronal loops. The HMI magnetogramsrevealed the continuous emergence of new magnetic flux along with shear flowsat the site of the blob formation. It is inferred that the emergence of twistedmagnetic fields in the form of arch-filaments/"anemone-type" loops is thelikely cause for the plasma blob formation and associated eruption along withthe triggering of M-class flare. Furthermore, the faster EUV wave formed aheadof the blob shows the signature of fast-mode MHD wave, whereas the slower waveseems to be generated by the field line compression by the plasma blob. Thesecondary wave trains originated from the funnel-shaped loops are probably thefast magnetoacoustic waves.

Eruption of a plasma blob, associated M-class flare, and large-scale EUV wave observed by SDO