The USGS cautioned that "additional such explosions are expected and could be more powerful".
The US administration, under President Donald Trump, has been sticking to a strategy of "maximum pressure" on the DPRK to force it to abandon its weapons programs, but so far has failed to achieve its goals.
The US government reacted too slowly to contain the COVID-19 pandemic as the virus was spreading from Europe, which led to the surge of infections and deaths in the country, a top official at the US Centers for Disease Control and Prevention said.
The U.S. State Department reiterated Washington's intention to continue its diplomatic engagement with Pyongyang. "We want to have diplomatic engagement with the North Koreans," spokesperson Morgan Ortagus told a press briefing last week.
The US, meanwhile, hopes to revive human space exploration, which has not risen to the expectations of the early space era.
The US Federal Reserve is expected to announce Friday that industrial production declined a seasonally adjusted 11.1 percent in April, the sharpest monthly decline in more than 100 years.
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The US Federal Reserve has slashed interest rates to encourage spending and investment. The result has been record-low mortgage rates and lower interest rates on credit card debt.
The United States suffered the most from the pandemic, with 3,054,695 COVID-19 cases and 132,299 fatalities up to date, according to the Center for Systems Science and Engineering at Johns Hopkins University.
The US had canceled its substantial budget contribution to UNESCO in 2011 in protest at a decision to grant Palestine full membership.
The US-based Emerson Electric Co opened a new measurement technology center in Beijing on Nov 14 to serve its automation solutions business in China and across Asia.