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Interactive fault map and comprehensive geologically based information on known or suspected active faults and folds in the United States. Also, generalized fault data used in the hazard maps. View Fault Map
Feb 6, 2024 · This map from the updated National Seismic Hazard Model shows the probability of a damaging earthquake occurring anywhere in the United States in 100 years. A damaging quake is any temblor with...
- Structure
- Boundaries
- Geology
- Formation
The outermost part of Earth's structure is known as the lithosphere. The lithosphere consists of the crust and small portion of the upper mantle. The lithosphere is divided into a number of tectonic plates. These plates move and interact with one another, driven by convectional forces within the Earth. The map at the top of this page shows the geog...
The edges of Earth's lithospheric plates have boundaries which are both well defined and poorly defined. Well-defined boundaries include mid-ocean ridges and ocean trenches. These boundaries are usually well enough defined that they can be plotted on a map at a reasonably accurate location. The boundary between the North America Plate and the Euras...
Mid-ocean ridges are divergent boundaries where convection currents in the mantle lift the ocean floor and produce a rift in the lithosphere that follows the crest of the ridge. New lithosphere is created by volcanic activity along the crest of the ridge, and the plates on either side of the ridge are moving away from one another.
Ocean trenches form where a plate with a leading edge of oceanic lithosphere collides with another plate. In these situations, an oceanic plate normally subducts into the mantle, forming a topographic low on the ocean floor. The point on the seafloor where the colliding plates are in contact is normally considered to be the geographic location of t...
Feb 14, 2024 · High Hazard in California, Alaska, and Hawaii. According to the NSHM, seismic hazard is highest in California, southern Alaska, and Hawaii; some regions have a 95% probability of suffering a...
- Caroline Hasler
Jan 18, 2024 · A new, ultra-detailed map shows that 75% of U.S. states are at risk of damaging earthquakes, but some are at far more risk than others.
Widespread Hazard: 37 U.S. states have experienced earthquakes exceeding magnitude 5 during the last 200 years, highlighting a long history of seismic activity across this country.
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May 21, 2018 · Here, we compile a nationwide stress map based on formal inversions of focal mechanisms that challenges the idea that deformation in continental interiors is driven primarily by broad, uniform...
