Seismic Data Suggests Hidden Chinese Nuclear Test In 2020 Christopher Yeaw , head of the State Department's Bureau of Arms Control and Nonproliferation , said the event occurred on June 22, 2020, near China's Lop Nur test site in Xinjiang, reported The Washington Post. "We're not going to remain at an intolerable disadvantage," Yeaw said at the Hudson Institute in Washington. He cited seismic readings from a facility in neighboring Kazakhstan that measured a magnitude 2. 76 event, which he said did not resemble an earthquake or mining explosion. Yeaw added that China likely used "decoupling" techniques to muffle the blast and obscure its yield, which remains unknown. "We know that they were preparing designated tests of hundreds of tons," he said. The Comprehensive Nuclear-Test-Ban Treaty Organization, which monitors nuclear explosions, confirmed detecting "two very small seismic events, 12 seconds apart" but said they were too small to determine their cause. Trump Resumed US Nuclear T...