A 54‑year‑old American seismologist who has helped decode North Korea’s underground nuclear tests is now imprisoned in China on espionage charges, according to his family.
Chen Youlin, 54, was detained while visiting family in Beijing in November 2024. His wife, a fellow seismologist, says he worked transparently with Chinese colleagues and that the accusations are “wrong and inconsistent” with the public nature of his research.
The U.S. says the scientist’s work focused on monitoring North Korea—an ally of China—through seismic data. China has denied any wrongdoing but maintains that its judicial system is proceeding according to law, a stance that risks hardening diplomatic ties.
U.S. Senator Edward Markey and hostage‑advocacy groups urge Chinese officials to release Chen, pointing to his diabetes, high blood pressure and the lack of medical care in custody. They fear the case will deter other scholars from collaborating internationally.
This arrest follows another U.S. scholar’s detention in China, marking a growing trend of political pressure on academic researchers who work on sensitive topics like nuclear testing. The international community watches closely as the situation unfolds.
