I wonder if the US Navy SOSUS facility at Dam Neck, Virginia provided any information regarding the location of the crash site. They would surely have been able to pick up the sounds of the impact. If seismic sensors picked up the impact ther sonar hydrophone system operated by the Navy would have as well.
That information would be fairly accurate as to location as shown by the system locating the USS Thresher loss site and later the USS Scorpion.