Can’t imagine an earthquake that deep. And I am a geologist.
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China doing more testing?
https://nypost.com/2020/04/16/china-denies-us-claim-that-it-tested-nuclear-weapons/
A deep-focus earthquake in seismology (also called a plutonic earthquake) is an earthquake with a hypocenter depth exceeding 300 km. They occur almost exclusively at convergent boundaries in association with subducted oceanic lithosphere. They occur along a dipping tabular zone beneath the subduction zone known as the Wadati–Benioff zone.[1]