Ground Failure After the 2025 Myanmar Earthquake Explained
USGS models identified areas exposed to earthquake-triggered landslides and liquefaction after the magnitude 7.7 Myanmar earthquake, while remaining regional estimates rather than site inspections.
Timeline
- March 28, 2025: A magnitude 7.7 earthquake struck near Mandalay at a shallow depth.
- Early response: USGS released rapid shaking, impact and ground-failure assessments.
A magnitude 7.7 earthquake struck near Mandalay, Myanmar, on March 28, 2025 at a depth of about 10 kilometers. Strong shaking caused direct structural damage, while USGS rapid assessments also indicated broad exposure to two secondary hazards: earthquake-triggered landslides and liquefaction. [1][2]
Ground failure means the soil or rock itself loses stability or moves because of shaking. Landslides occur when material travels downslope. Liquefaction can happen where loose, water-saturated sediment temporarily loses strength, allowing the ground to settle, spread laterally or undermine foundations and buried infrastructure. [1][2]
USGS ground-failure products combine estimated shaking with environmental inputs such as slope, geology, soil wetness and susceptibility. They show where consequences are more likely at a regional scale. They do not confirm that a specific building lot liquefied or that every highlighted hillside failed. [1][2]
The distinction matters in emergency response. A probability map can help teams identify corridors, settlements and infrastructure that may need closer examination, especially when field access is limited. Engineers still need local observations, geotechnical data and damage inspections before making decisions about an individual structure or slope. [1][2]
The earthquake’s shallow depth contributed to intense surface shaking, and USGS issued a red PAGER alert for potentially severe fatalities and economic losses. Ground failure can compound those losses by blocking roads, damaging utilities, affecting riverbanks and isolating communities after the initial shaking stops. [1]
Aftershocks add another layer of risk. Slopes and structures weakened by the mainshock can fail during later shaking, rainfall or construction activity. USGS noted that aftershocks could continue for weeks, months or years, although the probability of larger aftershocks changes as time passes. [1]
Rapid products are updated as more seismic observations and models become available. Early maps are most useful as screening tools rather than precise forecasts of every failure. A responsible reading separates the earthquake’s measured location and magnitude from modeled shaking, modeled ground-failure likelihood and later verified damage reports. [1][2]