 According to initial reports from South Korean government sources, the test was carried out at a mountain in Musadan-ri in Hwadae-kun, near the city of Kilchu, in North Hamgyŏng province on the northeast coast.However, later reports from the state National Intelligence Service identified the site as being a place in Sangpyong-ri, about 15 km from the coastal city of Kimchaek and about 50 km west of Musadan-ri.The Korea Institute of Geoscience and Mineral Resources reported seismic waves measuring 3.58 on the Richter scale.