I am afraid you can't observe a tiny explosion from space.
The Keck is a telescope built for observing distant stars: this means it is designed to take long exposures of dim objects.
On the other side, if you are looking at a planet surface from a close orbit, you have two problems:
- you are flying really fast (several km/s) with respect to the ground, so the ground below your objective is also moving that fast. You need dedicated optics to make a decent image out of that.
- statistically speaking you have a lot of light sources around your Region Of Interest, making your ROI a needle in a haystack.
If instead you are orbiting far from the planet you become limited by the resolution of the optics.
XKCD has already answered to something similar to your question:
Unfortunately, our desk is moving across the telescope’s field of view about 600 times faster than the Moon. Tracking is unavoidable.
The strange thing is, the desk really isn’t moving all that fast. Hubble is just really slow. To track the surface, it would need to rotate less than a degree per second at maximum.
But Hubble wasn’t built for surface tracking. The telescope’s top rotational (“slew”) speed is only a few degrees per minute (about the speed of a minute hand on a clock) and even those speeds are fast enough that its gyroscopes cause it to vibrate, which destroys the image quality.