Core Points - The China-Indonesia geological and geophysical joint scientific expedition has commenced, marking a significant collaboration in marine science between the two countries [2][3] - The expedition is organized by the Second Institute of Oceanography and involves 15 Chinese scientists and 12 Indonesian scientists aboard the "Jiageng" research vessel [2] - The focus of the expedition is on the deep structure of the Java subduction zone, conducting explorations such as underwater seismic and electromagnetic surveys [2] Summary by Categories Collaboration and Partnerships - The collaboration between the Second Institute of Oceanography and Indonesian institutions has a long history, with previous agreements signed for marine science cooperation [3] - This joint expedition represents a critical step from framework cooperation to practical implementation, enhancing scientific collaboration [3] Scientific Objectives - The expedition aims to investigate the deep structure, dynamic evolution, and geological characteristics of the lithosphere in the Java Sea area [2] - The results of the expedition are expected to contribute to the development of plate convergence theory and provide technological support for marine earthquake and tsunami disaster warning [2]