Radiating Energy (image) The Earth Institute at Columbia University Share Print E-Mail Caption A 2017 nuclear bomb test at North Korea's Mt. Mantap (star) set off subsequent earthquakes northwest of the test site over a period of 8 months. Seismic stations in Russia, China and South Korea picked up the tremors. Credit Won-Young Kim/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.