South Korea was shocked, both literally and figuratively, when a record-breaking earthquake with a magnitude of 5.8 hit Gyeongju, Gyeongsangbuk-do Province on September 12, only three days after the North’s fifth nuclear test. It was one of the strongest earthquakes South Korea has experienced since 1978.

Perhaps unsurprisingly, rumors quickly spread on South Korean social media, with some people suggesting a connection between the North Korean government’s test and the earthquake in the South.