Abstract: At 17:06 on June 16, 2026 (Beijing Time), a 6.3-magnitude earthquake struck the Dachaidan Administrative Committee in Haixi Prefecture, Qinghai Province (37.80°N, 95.56°E). The earthquake had a focal depth of 10 km and originated along the Dachaidan-Zongwulong Mountain Fault. Based on field investigations of earthquake damage and intensity assessments, this paper systematically analyzes the damage characteristics and disaster mechanisms of this earthquake. The results show that the area with intensity VI or higher covered approximately 6 144 km², while the area with intensity VIII covered approximately 31 km². The damage was primarily manifested in severe destruction of old civil engineering, brick-wood, and brick-concrete structures that were not built in accordance with current seismic design standards; some frame structures designed to meet current standards were also damaged; urban road and traffic infrastructure was destroyed; and secondary disasters such as rockfalls, landslides, soft-soil subsidence, sand liquefaction, and surface cracks occurred. Although this earthquake was strongly felt, had a high macroseismic intensity, and exhibited significant site and fault effects, the overall damage was relatively minor—resulting in only one fatality and eight minor injuries—due to the region’s low population and building density, high seismic design standards, and a rapid and efficient emergency response. This study highlights the unique characteristics of seismic disasters in high-altitude, low-population-density areas, demonstrating that seismic design standards, site conditions, and emergency management play a critical role in mitigating seismic damage. It provides a scientific reference for post-earthquake reconstruction and seismic hazard mitigation in similar regions.