Both incidents resulted from gravitational slip on these age-old structures, the foremost being the Ramapo Fault. The Ramapo Fault belongs to a network of faults oriented northeastward and dipping ...
The ‘epicenter’ sits on the Ramapo Fault, the longest system of cracks in the Northeast, which formed 400 million years ago - much older than California's 28-million-year-old San Andreas.