An aftershock with a preliminary magnitude of 4.0 struck just southwest of Gladstone, New Jersey, as reported by the United States Geological Survey. The event occurred at approximately 5:59 p.m. Eastern Time.
This aftershock follows the main shock of 4.8 magnitude that took place earlier in the day, nearly 8 hours prior. Since the initial earthquake, there have been at least 10 aftershocks recorded in the region, with most registering in the 1.8 to 2.2 magnitude range.
