Sandwich Fault Zone
Encyclopedia
The Sandwich Fault Zone is a fault zone that runs northwest from Oswego
to Ogle County
, transecting Lee County in Northern Illinois
. The fault has generally not been active, although there was a minor earthquake in 2002, and another
, slightly larger one, in 2010. It has a largely 400 to 600-foot vertical displacement, although parts can reach up to an 800-foot displacement, and is likely a configuration of several smaller faults, varying in both direction and displacement.
Oswego, Illinois
Oswego is a village in Kendall County, Illinois, United States. As of the 2010 census, the village population was 30,355. Its population has more than doubled since the 2000 census count of 13,326...
to Ogle County
Ogle County, Illinois
Ogle County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 53,497, which is an increase of 4.8% from 51,032 in 2000. Its county seat is Oregon, and its largest city is Rochelle...
, transecting Lee County in Northern Illinois
Northern Illinois
Northern Illinois is a region generally covering the northern third of the U.S. state of Illinois.-Economics:Northern Illinois is dominated by the metropolitan areas of Chicago, Rockford, and the Quad Cities, which contain a majority of Illinois' population and economic activity, including...
. The fault has generally not been active, although there was a minor earthquake in 2002, and another
2010 Illinois earthquake
A magnitude 3.8 earthquake hit Northern Illinois at 03:59:35 a.m. CST on February 10, 2010. Originally measured at a magnitude 4.3 and a depth of , the earthquake's epicenter was about west-northwest of Chicago, east-northeast of the village of Virgil in Kane County, and northwest of the...
, slightly larger one, in 2010. It has a largely 400 to 600-foot vertical displacement, although parts can reach up to an 800-foot displacement, and is likely a configuration of several smaller faults, varying in both direction and displacement.