Harrisburg, PA: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Harrisburg is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Harrisburg sits at the 46th percentile for seismic hazard among 4,875 US cities.

Where Harrisburg sits in Pennsylvania

USGS's underlying values for Harrisburg: 0.071g peak ground acceleration, 0.136g at short period, 0.043g at 1 second. Within Pennsylvania alone, Harrisburg ranks 76 of 193 cities by seismic hazard - the 61th percentile in-state. Harrisburg has a population of about 50,649.

What a retrofit costs in Harrisburg

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Pennsylvania specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Pennsylvania.

What this means for insurance

A Harrisburg homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Harrisburg's figures come from

Harrisburg's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about Harrisburg.