Likely the deepest ever recorded, as well.
No. They are not common, but it happens and even deeper.
http://earthquake.usgs.gov/earthquakes/map/#%7B%22feed%22%3A%221433023222278%22%2C%22sort%22%3A%22newest%22%2C%22mapposition%22%3A%5B%5B-85%2C0%5D%2C%5B85%2C360%5D%5D%2C%22viewModes%22%3A%7B%22help%22%3Afalse%2C%22list%22%3Atrue%2C%22map%22%3Atrue%2C%22settings%22%3Afalse%7D%2C%22autoUpdate%22%3Afalse%2C%22search%22%3A%7B%22id%22%3A%221433023222278%22%2C%22name%22%3A%22Search%20Results%22%2C%22isSearch%22%3Atrue%2C%22params%22%3A%7B%22starttime%22%3A%222000-01-01%2000%3A00%3A00%22%2C%22minmagnitude%22%3A4%2C%22mindepth%22%3A677%2C%22endtime%22%3A%222015-05-30%2023%3A59%3A59%22%2C%22orderby%22%3A%22time%22%7D%7D%7D