clatthrate or hydrate release due to a little quake, good idea.
I had not thought about the earthquake. There are numerous reports of lights in the sky following earthquakes.
A quartz crystal will produce a stable RF signal due to the piezoelectric effect. Stressed rocks in a fault zone also produce RF EM discharge. This presumably interacts with the air above the fault, or the gas discharged during the earthquake to produce a glow in the night sky.
I can understand the hydrate release associated with the earthquake. Would pressurized bubbles make it to the surface intact? Would the bubbles glow as they approach the surface and expanded? Or would the gas simply be absorbed into the water as it rose?
I assume that the gas makes it to the surface and will glow at that point. Does the EM Radiation make it through the water and cause the glow? Interesting questions.