China detains US seismologist Chen Youlin on espionage charges

China has detained a US seismologist who studies nuclear tests, with his family saying he has been held on espionage charges since November 2024. Chen Youlin, 54, was arrested during a trip to Beijing to visit family, according to a hostage advocacy group. The case has drawn attention because he has remained in detention for nearly two years and is the only US citizen currently designated as wrongfully detained.

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Chen specialises in using seismological data to track nuclear tests, including work related to North Korea. His wife, Rong Yufang, who is also a seismologist, said his research was public and collaborative and that the allegations were inconsistent with the nature of his work. She said she had not been able to speak with him for more than 600 days and expressed concern about his health and well-being.

In comments reported through the advocacy group, she also said Chinese authorities interrogated him more than 100 times about his work and that he was not allowed to see a lawyer for the first 13 months of his detention. The case has wider significance because Chen's published work touches on nuclear-test monitoring, a sensitive area in China and across the region. His research has included a December 2020 study using seismic data recorded across Asia, including China, to improve methods for nuclear-test monitoring and yield estimation.

The family says he worked closely with Chinese colleagues and that his projects were transparent, while it remains unclear whether and how his work may have intersected with China's own nuclear programme. The detention also comes against a backdrop of long-running concern over espionage cases in China, where convictions can carry severe penalties, including life imprisonment or death. China's foreign ministry said at a daily briefing that its judicial authorities handle cases in accordance with the law.

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The ministry rejected the idea of wrongful detention, saying there is no such thing as so-called wrongful detention. Chen was born in China and became a US citizen in 2011, and he lives in Boston, Massachusetts. His work has also included projects funded by the US government, adding to the diplomatic sensitivity of the case.

The detention is likely to remain a point of concern in US-China relations because it involves a scientist whose work sits at the intersection of academic research, nuclear monitoring and national security. North Korea's nuclear programme and underground tests have long been a focus of international scrutiny, and seismic analysis is one of the tools used to study such activity. At the same time, Beijing has denied US intelligence assessments that it is developing a new arsenal and conducting secret tests, underscoring the political sensitivity around the subject.

What remains unclear is the precise evidence behind the espionage allegation and whether Chen will be granted access to legal representation or family contact. It is also not known whether the case will move toward trial or any diplomatic resolution. For now, the family says it sees no sign of release, and the case continues to highlight the risks faced by foreign nationals detained in China on national-security grounds.

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