As with all major quakes, the New Madrid quakes spawned
a lot of aftershocks, says Morgan Page, a geophysicist with the U.S. Geological Survey (USGS) in Pasadena, California.
«Most big sequences of earthquakes that we see are either a main shock and
a lot of aftershocks or it might be right at the middle of a volcano in a volcanic system or geothermal system.
Not exact matches
A comprehensive analysis
of 101 major earthquakes around the Pacific ring
of fire between 1990 and 2016 shows that most
of the
aftershock activity occurred on the margins
of the areas where the faults slipped a
lot during the main earthquakes.