The earthquake monitoring work in the United States started early and has enjoyed a leading position in the fields of network design, equipment development, software development, standard formulation, data management, and new technology application. In recent years, earthquake data products in the United States have achieved a leap from singularity to diversification and customization with the development of mobile Internet and the advancement of projects, such as strong earthquake observation, earthquake early warning, and large-scale seismic arrays. Although the earthquake monitoring work in China started late, with the implementation of a series of major projects in recent years, such as the national seismic intensity rapid reporting and early warning, the “Belt and Road” seismic monitoring network, and the China seismic experimental site, the seismic network density, monitoring and early warning ability, intelligent processing of seismic data, service level, and application of new technologies in China have all made great progress. This paper introduces the progress of earthquake monitoring in the United States from five aspects: earthquake monitoring architecture, seismic network layout, data processing system, earthquake warning system, and data products, to better understand the current situation of international earthquake monitoring. Then, a comparative analysis is conducted with the current earthquake monitoring efforts in China. The study results can provide a reference for the further planning and development of earthquake monitoring and early warning in China.