Ridgefield residents woke Wednesday morning feeling a bit rattled. That\u2019s because a \u00a0magnitude 2.2 earthquake was registered in the Lake Mohegan area of New York \u2014 west of Goldens Bridge \u2014 at 6:14 a.m., according to the U.S. Geological Survey. Several residents posted on social media about the quake. \u201cRattled windows in Ridgebury,\u201d said one resident on Facebook, \u201cdeep rumble.\u201d \u201cThings fell in my kids\u2019 rooms above me,\u201d added another resident, who lives near Rainbow Lake. "This is something for us all to think about: The epicenter of this 2.2 quake is 20 miles (as the crow flies) from town hall," another resident posted. "But it is only 8 miles from the Indian Point power plant. If the energy we felt dissipates at something like the square of the distance (physicist please correct me on this), then the effect of the quake as measured at Indian point would be something like 6x the effect felt in Ridgefield." There were no immediate reports of injuries or damage. West Lane residents \u2014 and some others in the downtown area \u2014 also reported feeling the quake. Lake Mohegan is about 50 miles north of New York City. Ridgefield has experienced quakes in the past because it lies on \u201cCameron\u2019s Line,\u201d a fault that runs from Manhattan northeasterly through Westchester and into Ridgefield. The last earthquake that was felt in town was Oct. 19, 1985. History of Cameron's Line At 6:07 on the morning of Oct. 19, 1985, Ridgefielders who were awake\u2014and those who were awakened\u2014felt something unusual. Their homes were shaking: dishes rattled a bit; pictures tilted a tad; old plaster may even have cracked. They were experiencing the effects of the first significant earthquake in the New York metropolitan area in a century. Centered near Ardsley, N.Y., in neighboring Westchester County, the quake registered 4.0 on the Richter scale. The previous major earthquake, in 1884, measured 5.0. There was no significant damage in Ridgefield and little elsewhere, though a New York town reported some cracked pavement. However, the quake brought to light a geological phenomenon that had been little known outside scientific circles, and that affects the very foundation, literally, of Ridgefield. The quake was strongly felt along \u201cCameron\u2019s Line,\u201d a fault that runs from Manhattan northeasterly through Westchester and into Ridgefield. Here, the line enters near the southwest corner of town and almost exactly follows West Lane and High Ridge into the village. It continues across Prospect Ridge, through Great Swamp and Farmingville, then into Redding, on up to Danbury and northerly into Litchfield County. But Cameron\u2019s Line is no run-of-the-mill fault. As veteran science reporter Walter Sullivan explained it in The New York Times the day after the quake, the line \u201cmarks an abrupt change in the earth\u2019s crust that resulted from a collision between North America and a European-African land mass 400 million years ago.\u201d \u00a0Later, the European-African continent pulled away, leaving behind a piece of its edge. Geologists with the Hudson Institute of Mineralogy describe the result this way: \u201cThe rocks south of the Cameron\u2019s Line are mostly Ordovician unnamed felsic orthogneiss with some of the Harrison Gneiss metadiorite in the Branchville area. North of Cameron\u2019s Line, higher elevations with rugged topography along the eastern, northern and western part of town (such as under Pine, Ned, and West Mountains), are underlain by Grenville age Laurentian gneiss bedrock.\u201d More simply put, if you live in the southern third of town, the earth beneath you closely matches the geology of today\u2019s western Africa while folks in the northern two-thirds of the town live atop North American rock. Mild quakes, the kind most people would not even feel, occur fairly often along Cameron\u2019s Line and many other faults in the region. The 1985 quake in Ardsley was actually centered two miles west of the line, but it was felt along the fault on up into western Massachusetts. Connecticut as a state has several earthquakes a year, but they are below 2.5 on the Richter scale, and generally not felt. The area around Moodus, in eastern Connecticut, is famed for its \u201crumblings\u201d and has experienced series of up to 400 quakes over six weeks, mostly too small to feel. (Native Indians called East Haddam, the next town south, morehemoodus, \u201cplace of noises.\u201d) In October 1989, the Loma Prieta earthquake in California registered 6.9, killed 63 people, injured 3,700, and damaged 12,000 homes and 2,600 businesses. Forty buildings collapsed in Santa Cruz. A week later, scientists told The Ridgefield Press that the town could experience an earthquake \u201cwith the level of violence and\u2026havoc\u201d of the California quake. Here, however, the damage would be even worse than an equivalent shock in California, both because most buildings haven\u2019t been designed with quakes in mind, and because the crust of the earth is more solid and able to transmit and maintain the magnitude of earthquake waves than the softer ground of the West Coast. That same year, the state passed building codes incorporating the need for seismic designs, but many older buildings\u2014such as most of our schools and the Town Hall\u2014are brittle brick and\/or cement block structures that don\u2019t do well in quakes (wooden houses are the safest). There are many faults that crisscross the metropolitan New York region, and scientists seem uncertain about the level of danger they may present. The faults are certainly not as active as California\u2019s. Back in 1985, Columbia University seismologists said the Oct. 19 quake might have been a warning of a more severe quake to come within months. \u201cThey stressed, however, that this was a possibility, rather than a probability, and other specialists expressed doubts regarding the prognosis,\u201d said The Times. In 2011, the 5.8 quake in Virginia that damaged the Washington Monument was felt in Ridgefield (and across 12 states and southern Canada). But as of this writing, no local quakes like Arsley\u2019s has occurred since 1985. And for most of us, that\u2019s just fine. \u2014from Hidden History of Ridgefield, \u00a9 2015, The History Press.