Abstract：In recent years, high-precision time-varying gravity observation technology on land has developed rapidly. In addition to the continuous improvement of absolute gravity equipment such as quantum gravimeters, the layout of gravity observation network in Chinese mainland has also become increasingly perfect. A microgal-level time-varying gravity field observation network with a resolution better than 100 km has been built in the main active tectonic regions within Chinese mainland. This paper begins with the technology and method of terrestrial time-varying gravity observation. We first introduce the concept of land time-varying gravity observation, the classification of gravity instruments, and the construction and development of the high-precision gravity observation system in Chinese mainland, as well as the problems and optimization suggestions for this system. Then, we introduce the time-varying gravity technology methods and model products, and their applications in various fields. Finally, we discuss issues related to the data products and applications of land time-varying gravity and propose a design and layout plan for the next-generation land gravity observation system that aims to address the scientific questions of the China seismic experiment site and deep earth science. As a crucial part of the national geophysical monitoring network, terrestrial time-varying gravity observation generates high-precision model products that can not only aid in the study of deep crustal dynamics but also provide crucial data support for geophysical navigation and national defense.
PAN Yuhang,CHEN Zhaohui,CHEN Shi. Time-Varying Gravity in Chinese Mainland: Technological Exploration, Challenges, and Prospects for Applications[J]. jgg, 2024, 44(9): 959-971.
