Rapid report of the March 28, 2025 MW 7.9 Myanmar earthquake

On 28 March 2025, a moment magnitude (M W ) 7.9 earthquake struck Myanmar, marking it as the most powerful seismic event of the year. The earthquake occurred along the Sagaing Fault, a prominent right-lateral strike-slip fault and the most significant active tectonic structure in Myanmar. In response to this seismic emergency, the China Earthquake Networks Center (CENC) promptly published several reports on seismic source parameters. The focal mechanism solution indicates strike-slip faulting as the causative mechanism of the earthquake. Analysis of the rupture process indicates a predominantly unilateral propagation from north to south. The rupture extended over a length exceeding 200 km and persisted for approximately 95 seconds. According to the estimated seismic intensity map, the meizoseismal region experienced shaking intensity reaching up to X(10), while the area with intensity of more than VI(6) exceeds 443,487 km 2 . This earthquake inflicted substantial casualties and extensive property damage, underscoring the long-standing seismic hazard posed by the Sagaing Fault and highlighting the need for enhanced seismic preparedness and risk mitigation strategies in the region.