Earthquakes Near San Juan, Puerto Rico 🇵🇷

San Juan is located in Puerto Rico, which has a moderate seismic risk classification. Earthquake frequency varies, but the QuakeFYI monitoring system tracks all M2.5+ events within 500 km of San Juan in real time.

The seismic risk for San Juan is classified as moderate, based on the country-level seismic zone of Puerto Rico. With a population of 418,140, earthquake preparedness is an important consideration for residents.

The most significant historical earthquake near San Juan was a magnitude 8.3 event in 1843, approximately 468 km SE of the city, resulting in approximately 5,000 casualties. QuakeFYI tracks 5 significant historical events within 500 km.

The nearest major fault line to San Juan is the Great Southern Puerto Rico Fault, located approximately 80 km away and spanning 56 km in length. Proximity to active faults is a key factor in assessing seismic risk.

During an earthquake, follow the Drop-Cover-Hold On protocol: drop to your hands and knees, take cover under sturdy furniture, and hold on until shaking stops. Move away from windows, exterior walls, and heavy objects. After the shaking stops, be prepared for aftershocks and check for injuries and hazards.