Animated Blast Effect

Start with a new document and set size as you required then inset any object to make this effect, I have taken a time bomb picture. 

Choose Elliptical marquee tool (M key) and draw a circle selection then take a new layer and fill "#f88102" color by the Paint bucket tool (G key) in the  selection.

Now change foreground and background color then apply noise effect two times by following this path "Filter menu > Noise > Add Noise" as given below.

After done noise effect, apply ripple effect to modify the circle shape by following this path "Filter menu > Distort > Ripple" as given below.

Now I am going to make radial blur effect to make like explosion, follow this path "Filter menu > Blur > Radial Blur" and make setting as here. 

This type of picture will come out.

Make duplicate layer of the explosion effect and press Ctrl + F key to apply again ripple effect, use same step again on new layer.

It is time to make animation so you have to go to Window menu and choose Animation, a frame window come on. Adjust all the layer on the frame as given below.

This is the explosion effect.