A moderately strong, 5.6-magnitude earthquake struck in Guatemala on Tuesday, according to the United States Geological ...

A minor, 3.3-magnitude earthquake struck in Northern California on Monday, according to the United States Geological Survey.

A map displays the likelihood of damaging earthquake shaking in Alaska. USGS. In the last two centuries, 37 states have seen an abundance of magnitude 5 earthquakes, according to the study.

This map shows locations of earthquakes of magnitude 2.5 or larger. Red circles mark earthquakes from 1974-2002; green ones occurred before 1974.

Nearly 75% of the U.S., including Alaska and Hawaii, could experience a damaging earthquake sometime within the next century, USGS study finds.

Using this map, researchers chose spots to dig trenches across the fault to study past earthquakes. These trenches let scientists examine layers of soil that shifted during old quakes.

The U.S. Geological Survey's new seismic hazard maps, released this week, show two more earthquake faults in Western Washington: one near the Canadian border, the other east of Port Angeles.

Earthquakes are caused by a sudden slip of a fault or fracture in Earth’s crust. Tectonic plates are constantly moving slowly, but their rough edges often contain faults and get snagged.