Earthquake magnitudes are determined by seismometers, which record the vibrations that travel through the earth. RELATED: Delaware hit by at least 59 earthquakes since 1871 They are very sensitive ...

It seems the safety analysis, and the earthquake predictions, were done by Holtec before the shale-oil revolution took off in the Delaware basin. In fact, one Holtec graphic of earthquake ...

Aftershocks continue to affect the region after Friday's 4.8 magnitude earthquake in New Jersey, which was felt across the East Coast, including in Delaware. The initial quake occurred about 4.3 ...