From a list & map of known seamounts and submarine volcanoes it is unlikely the orange region in your picture is a submarine volcano.

The average depth of the Pacific Ocean is 4280 m. At such a depth, a submarine volcanic eruption would not produce such a large area of illumination.

It is more likely that the orange region in your picture is sunglint, which is,

a phenomenon that occurs when sunlight reflects off the surface of the ocean at the same angle that a satellite or other sensor is viewing the surface. In the affected area of the image, smooth ocean water becomes a silvery mirror, while rougher surface waters appear dark.