Tokyo - Japan's only working nuclear power plant sits on what may be a seismic fault in the earth's crust, a geologist has warned, saying it is "very silly" to allow it to continue operating. Watanabe, a tectonic geomorphologist, is part of a five-member team tasked by the Nuclear Regulation Authority with looking into the tectonic situation underneath the plant, where the country's only working reactors are."We would have learned nothing from Fukushima. I'm afraid we would see a repeat (of the disaster) one day."Hundreds of thousands were made homeless and tracts of prime agricultural land were left unfarmable."We have to sound the alarm as soon as we find the possibility of active faults," he said. "The accident in Fukushima had really never been imagined. Scientists must learn from that."