Does Riverdale Park, MD need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Riverdale Park 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 Riverdale Park sits at the 43th percentile for seismic hazard among 4,875 US cities.

How Riverdale Park compares

USGS's underlying values for Riverdale Park: 0.068g peak ground acceleration, 0.132g at short period, 0.043g at 1 second. Within Maryland alone, Riverdale Park ranks 25 of 46 cities by seismic hazard - the 47th percentile in-state. Riverdale Park has a population of about 7,296.

What a retrofit costs in Riverdale Park

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 Maryland 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 Maryland.

Earthquake insurance for a Riverdale Park home

A Riverdale Park 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 Riverdale Park's figures come from

Riverdale Park'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 Riverdale Park.