Despite official assurances of no abnormalities at nuclear power plants in Kyushu and nearby areas after a series of earthquakes rocked the region, calls in and outside of Japan are growing to shut down the nation’s only two operating reactors at the Sendai plant in Kagoshima Prefecture.

Since Thursday, the Meteorological Agency has recorded nearly 530 quakes at level 1 or above on the Japanese intensity scale in Kumamoto and Oita Prefectures. This includes more than 80 registering a 4 or higher on the scale. The agency has warned that seismic activity in the region may continue over the next week, possibly prompting more deadly landslides.

But despite the frequency of the quakes, the Sendai plant, just over the border from Kumamoto in Satsumasendai, Kagoshima Prefecture, has continued to generate electricity since the initial magnitude-6.5 quake rocked Kumamoto on Thursday, followed by a magnitude-7.3 temblor early Saturday.