U.S. flag

미국 정부 공식 웹사이트입니다

Dot gov

.gov로 공식 웹사이트임을.

연방 정부 웹사이트는 종종 .gov 또는 .mil로 끝납니다. 민감한 정보를 공유하기 전, 귀하가 연방 정부 사이트에 접속하셨는지 확인하십시오.


이 사이트는 보안이 유지됩니다.

https://는 귀하가 공식 웹사이트에 접속했음과 귀하가 제공하는 정보는 확실히 안전하게 암호화 및 전송될 것입니다.

alert - warning

이 페이지는한국어로(으로) 번역되지 않았습니다. 해당 언어의 리소스는 한국어 페이지를 방문해 주십시오.

Earthquake Hazard Maps

The maps displayed below show how earthquake hazards vary across the United States. Hazards are measured as the likelihood of experiencing earthquake shaking of various intensities.

How To Read The Maps

The colors in the maps denote “seismic design categories” (SDCs), which reflect the likelihood of experiencing earthquake shaking of various intensities. (Building design and construction professionals use SDCs specified in building codes to determine the level of seismic resistance required for new buildings.)

The following table describes the hazard level associated with each SDC and the associated levels of shaking. Although stronger shaking is possible in each SDC, it is less probable than the shaking described.

SDC/Map ColorEarthquake Hazard Potential Effects of Shaking

Very small probability of experiencing damaging earth­quake effects.
B/GrayCould experience shaking of moderate intensity.Moderate shaking—Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.
C/Yellow Could experience strong shaking.Strong shaking—Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built structures.
D/Light Brown

D1/Darker Brown

D2/Darkest Brown
Could experience very strong shaking (the darker the color, the stronger the shaking).Very strong shaking—Damage slight in specially designed structures; considerable damage in ordinary substantial buildings with partial collapse. Damage great in poorly built structures.
E/Red Near major active faults capable of producing the most intense shaking.Strongest shaking—Damage considerable in specially designed structures; frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations. Shaking intense enough to completely destroy buildings.

*Abbreviated descriptions from The Modified Mercalli Intensity (MMI) Scale.

SDCs take into account the type of soil at the site, as poor soils can significantly increase earthquake shaking. These maps have simplified this by assuming normal Site Class “D” soils, which are the most commonly found.

When viewing the maps, it is important to remember that areas with high earthquake hazards do not necessarily face high seismic risks. Defined as the losses that are likely to result from exposure to earthquake hazards, seismic risks are determined not only by hazard levels but also by the amount of people and property that are exposed to the hazards and by how vulnerable people and property are to the hazards.


feature_standalone img

View earthquake hazards from across the United States.

Data For Building Design Professionals

The U.S. Geological Survey, in cooperation with FEMA and the Building Seismic Safety Council (BSSC), has developed a web-based seismic design application for building designers. This program can be used to obtain the earthquake ground motion parameters needed to design structures for specific geographic locations in accordance with the latest building code reference documents.

To access this application, as well as the seismic design maps on which it is based, go to U.S. Seismic Design Maps.