The 1944 San Juan earthquake killed around 10,000 people and remains the worst natural disaster in Argentine history.
Key Facts
- Date
- 15 January 1944
- Death toll
- ~10,000 (10% of city population)
- Estimated magnitude
- 6.7–7.8 Mw
- Buildings destroyed
- ~90% of city structures
- Epicenter distance from city
- 30 km north of San Juan
- Homeless
- One third of province population
By the Numbers
Location
Cause → Event → Consequence
San Juan province lies in a seismically active zone in central-west Argentina. The region's high earthquake risk was compounded by widespread use of low-quality adobe construction in residential buildings, making the city particularly vulnerable to seismic shaking.
On 15 January 1944 at 8:49 pm, an earthquake with an estimated moment magnitude between 6.7 and 7.8 struck with its epicenter near La Laja, approximately 30 km north of the provincial capital. Around 90% of San Juan's buildings were destroyed or rendered structurally unsound, killing approximately 10,000 residents.
The disaster prompted Argentina to launch a major reconstruction programme that introduced a modern building code informed by seismic science. Adobe was replaced by stronger materials, concrete single-story houses became standard, and infrastructure was redesigned, fundamentally changing construction practices in the region.
Human Cost
Each dot represents approximately 10,000 deaths. Total estimated: 10,000 (earthquake)