Skip to main content
U.S. flag

An official website of the United States government

VA Fault Lines (Magnetic Data)

Detailed Description

 In map view, magnetic data were filtered (colors) to highlight geologic features near the earthquake depth. One contrast (blue dotted line) is aligned with aftershocks (black dots). The other crosses at an angle. They suggest that the earthquake (yellow star) occurred near a “crossroads,” or a complex intersection of different types of rock.