The New York City area is part of the geologically complex structure of the Northern Appalachian Mountains. This complex structure was formed during the past half billion years when the … See more

Regional setting
New Jersey, eastern Pennsylvania, and southeastern New York are divided geologically into four physiographic provinces, … See more

Despite the rarity of strong East Coast earthquakes in the United States, they do sometimes occur. Furthermore, when these rare eastern U.S. events do occur, the areas affected by them are, on average ten times as large as western ones for events of … See more