UPDATE, 12:33 p.m. JST: Journey to the Center of the Earth was operating again by 12:29 p.m. Sunday. The Tokyo DisneySea interruption had passed the two-hour mark before the ride returned.
The interruption started at 9:09 a.m. in Mysterious Island, shortly after Tokyo DisneySea opened for the day. The park is scheduled to operate from 9 a.m. to 9 p.m. Sunday.
This was a separate interruption from the ride's October 15 outage, when it also returned before the end of the park day.