The 20th International Conference on Earth Dynamics and Solid Earth Tides was successfully held in Strasbourg, France, from August 25th to 30th. This conference is a routine meeting of the International Association of Geodesy (IAG), held every four years. The conference was jointly organized by Séverine Rosat, Professor at the University of Strasbourg in France and Chair of the IAG Commission 3.1 on Earth Dynamics and Solid Earth Tides, and CUI Xiaoming, Associate Researcher and Vice Chair. Nearly 100 representatives from some countries and regions in Europe, Asia, and North America participated in the conference. A delegation from the Innovation Academy for Precision Measurement Science and Technology (APM), consisting of seven researchers including Academician SUN Heping, Associate Researchers CHEN Xiaodong and CUI Xiaoming, Postdoctoral Researchers ZHANG Yijun and SHI Kunpeng, and PhD student YANG Weiwei, participated in the conference, with Researcher ZHOU Jiangcun serving as the leader.

The conference aimed to exchange the latest research and application achievements in the field of international earth dynamics and solid earth tides. It featured six topics, a total of 49 oral presentations, and 37 poster presentations, covering tides and non-tidal phenomena, geodetic monitoring of natural disasters, subsurface fluid monitoring, new technologies, software, and inventions, time-variable gravity and mass redistribution, and variations in the Earth's rotation time. CHEN Xiaodong and CUI Xiaoming served as conveners for Topic 2 “Geodetic Monitoring of Natural Disasters” and Topic 6 "Temporal Variations of the Earth's Rotation," respectively, and presided over the topic report sessions.

At the opening ceremony, CUI Xiaoming introduced Academician XU Houze, the former Chair of the International Earth Tides Committee, and highlighted his outstanding contributions to the field of international geodesy and solid earth tides research. He also recounted XU Houze's historical role in promoting international cooperation with countries such as Belgium, France, Germany, the UK, the USA, Japan, Italy, and Russia, as well as leading the APM to become an internationally renowned research center for earth dynamics and solid earth tides. In memory of Academician XU Houze, all participants observed a minute of silence. During the conference, Chair Rosat and Vice Chair CUI Xiaoming also presented the "Paul Melchior Award" to Professors Agnew and Hinderer.

During the conference, the team members engaged in heated discussions and exchanges with international experts. Academician SUN Heping introduced the research progress and future plans of China's superconducting gravimeter. Other members presented their research work in China on deformation theory calculations, solid earth tide gravity, earthquake rupture processes, tidally triggered earthquakes, volcanic deformation monitoring, and Earth rotation dynamics in the form of academic reports, which received widespread attention from international peers.

At the working conference on the future development of international earth dynamics and solid earth tides, CHEN Xiaodong provided a detailed introduction to the data processing from level 0 to level 1 and level 2 at China's superconducting gravimeter stations in Wuhan, Lijiang, and Lhasa. The high-quality products achieved are comparable to those of the International Centre for Earth Tides (ICET), receiving favorable comments from international peers. Considering the increasing amount of global superconducting gravimeter observation data and the importance of the China region globally, all participants unanimously voted to establish a data analysis sub-center in China, responsible for processing level 2 data products from the global superconducting gravimeter network, with CHEN Xiaodong serving as the head of the analysis center. This will further enhance international cooperation and exchanges and expand the international influence of APM in this field.

the award ceremony for the Paul Melchior Award winners