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Spanning more than 185 miles (298 km) in New York, New Jersey, and Pennsylvania, it is perhaps the best known fault zone in the Mid-Atlantic region, and some small earthquakes have been known to occur in its vicinity.
Scientists suspect that the earthquake likely originated in the area of the Ramapo fault zone in the Newark basin. The fault system contains a branching network of faults.
The Ramapo fault (heavy dark line) separates the Newark rift basin from the Highlands and Valley & Ridge physiographic provinces. Other major faults in the Newark basin are the Flemington and Hopewell faults. The Newark basin is overlapped by Cretaceous and younger rocks of the Coastal Plain.
While there are many faults in New Jersey, the best known is the Ramapo Fault, which runs northeast-southwest in North Jersey. The majority of New Jersey's quakes occurred around this fault area.
According to information obtained by the United States Geological Survey on today, a 4.8 magnitude earthquake, believed to have originated from this fault line, was felt across more than a 100 mile radius marked the most substantial seismic activity in the region in nearly half a century.
The Ramapo Fault system includes several smaller, secondary faults, such as the Rockaway Valley, Flemington, Longwood Valley, Spruce Run and others.
The quake happened near the Ramapo Fault, an ancient and—many researchers believe—largely inactive structure trending north-northeast about 185 miles through Pennsylvania, New Jersey and New York.
The Ramapo Fault System is the longest in the northeastern U.S., stretching from Pennsylvania to southeastern New York. Map of the Ramapo Fault System: Earthquake epicenter at Lebanon, NJ....
The Ramapo Fault zone is a system of faults between the northern Appalachian Mountains and Piedmont areas to the east. Spanning more than 185 miles (298 km) in New York, New Jersey, and Pennsylvania, it is perhaps the best known fault zone in the Mid-Atlantic region, and some small earthquakes have been known to occur in its vicinity.
The Ramapo Fault, in green, is a major fault zone in New Jersey. The red dots indicate earthquakes of magnitude 3 or higher, reported by the U.S. Geological Survey and National Earthquake ...