The big red square is the earthquake that we just had. It was located pretty far away. According to the volcano information site, the quake was most likely associated with the natural readjustment of the earth's mantle due to the weight of Hawaii Island on it.
Here's some more info from the website:
Sorry the pics are so blurry. I took them from a screen capture, rather than a photo, so they aren't so good. But it gives you an idea.