San Juan, Puerto Rico 00901
San Juan County · Puerto Rico
18.4671° N, 66.1185° W
Calchis Hazard Scores
◎Hurricane
6.1/10MODERATE
CAT3+ historical landfall frequency (9 yr return, NOAA NHC/HRD)3.1 / 3.5
Distance to coastline3.0 / 3.0
Storm surge exposure (elevation + coastal proximity)0.0 / 3.5
Model v2.5 · Hazard score
≋Flood
2.1/10LOW
FEMA flood zone (X)0.3 / 4.0
Elevation above base flood level (estimated)1.0 / 3.0
Federal disaster declarations (11 in PR since 1953 · ~1 per 6.6yr)0.8 / 3.0
Model v2.5 · Hazard score
⊕Earthquake
1.2/10LOW
Seismic source zone activity (Gutenberg-Richter)0.5 / 3.5
Proximity to mapped Quaternary faults0.3 / 3.0
Historical damage potential (Hazus W1 thresholds)2.9 / 3.5
Model v2.5 · Hazard score
●Winter Storm
0.3/10LOW
Winter events per forecast zone per year (0.0719)0.1 / 5.0
Ice storm and blizzard share of winter events (1.3%)0.2 / 5.0
Model v2.5 · Hazard score
Not scored here: Wildfire, Hail, Tornado — each holds under 0.5% of the national record for that peril and is not on the kept list.
Natural Hazards in San Juan
Based on historical data and geographic analysis, the primary natural hazards affecting San Juan, Puerto Rico (00901) are hurricane and earthquake. These scores are derived from federal and academic sources.
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ZIP-level scores provide a general overview. For address-specific hazard analysis with consequence ring exposure, active event monitoring, and full score component breakdown — use the Calchis workbench.
Puerto Rico Hazard Profiles
Data Sources
USGS Earthquake Hazards.gov
NOAA National Hurricane Center.gov
FEMA Flood Map Service.gov
NIFC Active Fire Data.gov
NOAA Storm Prediction Center.gov
NOAA Storm Events Database.gov