'Weak' earthquake

The earth shook around Belfast. Just a little

Posted:  
Saturday, November 24, 2012 - 11:45am
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BELFAST —The epicenter of a small earthquake was just two miles northwest of Belfast at 11:25 p.m. on Nov. 23, but it was strong enough, at magnitude 2.0, to be felt in Camden, Morrill and Union, among other towns, with reports of a loud bang.

The depth of the earthquake was at approximately 4 kilometers (2.48 miles).

In Belfast, the intensity was recorded at III on the Modified Mercalli Intensity scale, which depicts shaking severity, according to the Association of Bay Area Governments in Oakland, California.

Read about the Belfast quake at the U.S. Geological Survey

And at the event page

A history of earthquakes in Maine

"An earthquake has a single magnitude that indicates the overall size and energy released by the earthquake," the association says at its website. "However, the amount of shaking experienced at different locations varies based on not only that overall magnitude, how far you are from the fault that ruptured in the earthquake, and whether you are on rock or thick valley deposits that shake longer and harder than rock."

Larger earthquakes taking place on Nov. 23 at various spots on the globe were record in Burma, Puerto Rico, Indonesia and California. Earthquakes are a regular occurence throughout the world, and the Geologic Survey keeps a constant tabs on where they have been recorded with this map.

However, in order to make the map, earthquakes have to reach a magnitude of 2.5; Belfast's was 2.0. There have been 216 earthquakes in the world over the past seven days with magnitude 2.5 and more. The biggest was 5.9 in Chile on Nov. 21.

 Citizens filed reports of sensing the Belfast earthquake at U.S. Geological Survey's Earthquakes Hazard Program.

"New England is laced with known faults but numerous smaller or deeply buried faults remain undetected," according to the USG. "Even the known faults are poorly located at the depths of most earthquakes. Accordingly, few, if any, earthquakes in New England can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. As in most other areas east of the Rockies, the best guide to earthquake hazards in New England and Long Island is the earthquakes themselves."

The largest earthquake ever reported in Maine occured on March 21, 1904, when, according to the Maine Department of Conservation, "a shock overthrew some chimneys at Calais and Eastport, Maine, and St. Stephen, New Brunswick. The total felt area covered most of New England and the Canadian Provinces of New Brunswick and Nova Scotia, approximately 150,000 square miles. There were several light shocks near the origin a few hours after the main earthquake."

 

In Maine, earthquakes are not uncommon, according to the Maine Department of Conservation's Bureau of Geology, Natural Areas and Coastal Resources, which compiled the following list.

 

Maine Earthquakes 1997 to Present

Asterisk (*) indicates earthquakes felt in Maine, but with epicenters outside Maine.
Most microquakes (magnitude less than 2.0), which are generally too small to feel, are not listed here.
(C) indicates a Coda magnitude; all others are Nuttli magnitudes.
Dates are given in local Maine time (EST or EDT).

Date Magnitude Location
October 16, 2012 magnitude 4.0    East Waterboro, about 13 miles northwest of Saco
February 17, 2012 magnitude 2.4    T18ED BPP, 11 miles north of Machias, eastern Maine
February 17, 2012 magnitude 2.3    12 miles north-northwest of Machias, eastern Maine
January 16, 2012 magnitude 2.1    7 miles south-southeast of Allagash, northern Maine
December 30, 2011 magnitude 2.0    12 miles south-southeast of Allagash, northern Maine
December 12, 2011 magnitude 2.3    Sedgwick, about 8 miles southeast of Castine, mid-coast Maine
July 7, 2011 magnitude 2.3    Brooksville, about 4 miles east of Castine, mid-coast Maine
April 30 - May 5, 2011 magnitude 1.7 and less    Bucksport - Searsport area, microquake swarm
March 25, 2011 magnitude 2.2    Burlington, about 9 miles southeast of Lincoln, central Maine
January 31, 2011 magnitude 2.0    near South Robbinston, about 11 miles north-northwest of Eastport
January 17, 2011 magnitude 1.4    town of Waldo, about 3 miles northwest of Belfast
August 29, 2010 magnitude 2.3    Hollis, about 9 miles west of Gorham
July 29, 2010 magnitude 2.6    Northfield, about 12½ miles northwest of Machias
June 23, 2010* magnitude 5.0    Canada, about 35 miles north-northeast of Ottawa. Felt in southwestern Maine.
June 7, 2010* magnitude 2.9    offshore, about 11 miles southeast of Boon Island (York County)
March 30, 2010 magnitude 3.0    near Orrington-Bucksport line, about 7 miles north of Bucksport
February 17, 2010* magnitude 1.7    offshore of Trescott Township, about 14 miles south-southwest of Eastport
February 2, 2010 magnitude 2.0    about 8 miles southeast of Masardis (northwest of Houlton)
December 7, 2009 magnitude 1.8    Gardiner
November 19, 2009 magnitude 2.5    South Andover, about 6 miles northwest of Rumford Center
December 24, 2008 magnitude 2.2    Clinton, about 10 miles northeast of Waterville
November 13, 2008 magnitude 2.2    Newry, about 10 miles west of Rumford
October 25, 2008 magnitude 2.6(C)    Livermore, about 21 miles north of Lewiston
October 24, 2008 magnitude 2.2(C)    Exeter, about 6 miles east of Corinna
August 30, 2008 magnitude 2.7(C)    Wilton, about 5 miles southwest of Farmington
August 22, 2008 magnitude 2.4(C)    Mount Vernon, about 14 miles northwest of Augusta
May 30, 2008 magnitude 2.4(C)    Flanders Bay, about 7 miles northeast of Bar Harbor
May 19, 2008 magnitude 2.4(C)    Presque Isle
December 11, 2007 magnitude 2.2    Topsham, about 5 miles northwest of Brunswick
October 9, 2007 magnitude 2.0    Andover, about 12 miles northwest of Rumford
October 2, 2007 magnitude 2.4(C)    Topsham, about 3 miles northwest of Brunswick
October 2, 2007 magnitude 2.3(C)    Lexington Township, about 22 miles northwest of Skowhegan
July 16, 2007 magnitude 2.4(C)    Lewiston
March 4, 2007* magnitude 2.2    About 10 miles east-southeast of Isle Au Haut (offshore)
February 26, 2007 magnitude 1.7    approx. 7 miles north-northwest of Ellsworth
February 1, 2007 magnitude 2.1    approx. 5.5 miles southwest of Augusta
December 29, 2006 magnitude 3.1    east of Cadillac Mountain, Mount Desert Island
December 18, 2006 magnitude 2.3    east of Cadillac Mountain, Mount Desert Island
October 22, 2006 magnitude 2.3    east of Cadillac Mountain, Mount Desert Island
October 2, 2006 magnitude 4.2    east of Cadillac Mountain, Mount Desert Island
September 28, 2006 magnitude 2.5    east of Cadillac Mountain, Mount Desert Island
September 22, 2006 magnitude 3.4    east of Cadillac Mountain, Mount Desert Island
August 5, 2006 magnitude 1.9    approx. 6 miles west of Byron, western Maine
July 14, 2006 magnitude 3.8    about 15 miles northwest of Portage, central Aroostook Co.
May 31, 2006* magnitude 1.6    approx. 23 miles southeast of Machias (offshore)
May 29, 2006 magnitude 1.5    approx. 7 miles southeast of Dover-Foxcroft
January 20, 2006 magnitude 1.8    approx. 6 miles southeast of Dover-Foxcroft
January 20, 2006 magnitude 1.7    approx. 13 miles southeast of Dover-Foxcroft
September 25, 2005 magnitude 3.5    approx. 8 miles northwest of Pembroke, Washington Co.
August 14, 2005 magnitude 1.9    China Lake region, northeast of Augusta (poorly located)
May 11, 2005 magnitude 2.4    approx. 6 miles northeast of Dover-Foxcroft
March 6, 2005* magnitude 5.4    northeast of Quebec City, Canada (felt widely across Maine)
June 22, 2004 magnitude 2.0    approx. 6 miles northeast of Dover-Foxcroft
March 29, 2004 magnitude <2.0(?)    felt in Hallowell, Farmingdale
March 16, 2004 magnitude 2.1    Cape Neddick area (offshore)
October 15, 2003* magnitude 3.1    approx. 11 miles east of Robbinston, Passamaquoddy Bay
August 22, 2003 magnitude 2.4    between Waterville and Augusta
March 15, 2003 magnitude 2.2    Limington-Standish area, southern Maine
February 11, 2003 magnitude 2.1    approx. 13 miles north of Dover-Foxcroft
May 11, 2002 magnitude 2.5    approx. 12 miles northeast of Newport (central Maine)
April 20, 2002* magnitude 5.3    near Plattsburgh, New York
March 15, 2002 magnitude 1.9    near Brownville Junction (central Maine)
February 25, 2002 magnitude 2.6    about 4 miles southwest of Bucksport
December 27, 2001 magnitude 2.8    approx. 35 miles northeast of Bangor
October 24, 2001 magnitude 3.3    approx. 2 miles south of Howland
July 14, 2001 magnitude 1.7    approx. 4 miles north of Harmony
July 13, 2001 magnitude 1.7    approx. 5 miles south of Dover-Foxcroft
July 1, 2001 magnitude 1.3    approx. 2 miles southwest of Bucksport
January 20, 2001 magnitude 2.5    approx. 8 miles northwest of Machias
September 7, 2000 magnitude 3.2    approx. 15 miles southeast of Waterville
January 17, 2000 magnitude 3.4    approx. 10 miles north of Rumford
January 3, 2000 magnitude 3.4    Turner-Livermore area
December 24, 1999 magnitude 3.0    Newport-Etna area
July 27, 1999 magnitude 2.7    approx. 30 miles south of Allagash
July 4, 1999* magnitude 2.3    approx. 20 miles southeast of Cutler (offshore)
June 9, 1999 magnitude 1.8    east of Petit Manan (offshore)
February 25, 1999 magnitude 3.6    approx. 7 miles southeast of Waterville
January 1, 1999 magnitude 2.3    Perry-Quoddy area, Passamaquoddy Bay
September 16, 1998 magnitude 2.6    near West Pembroke (eastern Maine)
September 5, 1998 magnitude 2.3    near Sedgwick (mid-coast Maine)
June 7, 1998 magnitude 1.9    approx. 12 miles southwest of Fish River Lake (northern Maine)
November 5, 1997* magnitude 5.1    near Quebec City, Canada (felt widely across Maine)
April 29, 1997 magnitude 3.0    near Wilton (central Maine)

Information Sources: Weston Observatory of Boston College, U. S. Geological Survey, Earthquakes Canada G.S.C., Maine Geological Survey

 


 

http://earthquake.usgs.gov/earthquakes/dyfi/events/us/c000dxll/us/index....