4.5 Quake off the coast of Massachusetts

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4.5 Quake off the coast of Massachusetts

#1 Postby brunota2003 » Thu Apr 12, 2012 7:40 am

And in our string of earthquakes in the last day or so, here is one in the Atlantic:

Earthquake Details

This event has been reviewed by a seismologist.

Magnitude 4.5
Date-Time

Thursday, April 12, 2012 at 02:29:41 UTC
Wednesday, April 11, 2012 at 10:29:41 PM at epicenter
Time of Earthquake in other Time Zones

Location 41.998°N, 65.994°W
Depth 15.8 km (9.8 miles)
Region NORTH ATLANTIC OCEAN
Distances 203 km (126 miles) S of Yarmouth, Nova Scotia, Canada
290 km (180 miles) SSW of Bridgewater, Nova Scotia, Canada
352 km (218 miles) SW of HALIFAX, Nova Scotia, Canada
421 km (261 miles) E of BOSTON, Massachusetts
Location Uncertainty horizontal +/- 22 km (13.7 miles); depth +/- 6.3 km (3.9 miles)
Parameters NST=125, Nph=138, Dmin=323.9 km, Rmss=0.89 sec, Gp=155°,
M-type=body wave magnitude (Mb), Version=8
Source

Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)

Event ID usc0009131


http://earthquake.usgs.gov/earthquakes/ ... 009131.php
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Re: 4.5 Quake off the coast of Massachusetts

#2 Postby somethingfunny » Thu Apr 12, 2012 9:13 am

I was reading about the earthquake history of Massachussetts not too long ago and was shocked to discover this:

(The links are to historical accounts that the USGS has archived)

http://earthquake.usgs.gov/earthquakes/ ... _10_hs.php

Northern Cape Ann region, east of Newbury, Massachusetts
1727 11 10 03:40 UTC
Intensity VII

At Newbury, many stone walls and chimney bricks were shaken down, and almost all tops of chimneys were knocked off. Considerable changes occurred in the flow of water in springs and, in some springs, changes occurred in the character of the water. "Some firm land became quagmire, and marshes were dried up." The rise and fall of the ground made it difficult to walk, and houses shook and rocked as if they would fall apart. Sand blows were reported near Spring Island. Felt from the Kennebec River in Maine to the Delaware River on the New York-Pennsylvania border and from ships at sea to the "extreme western settlements." Aftershocks occurred in the area for several months. The strongest aftershock (MM intensity V) occurred in the Newbury area on Dec. 28, 1727, and Jan. 4 and Feb. 10, 1728 (local dates).



http://earthquake.usgs.gov/earthquakes/ ... _14_hs.php

Southern Cape Ann, Massachusetts region
1744 June 14 15:15 UTC
Intensity VI

Bricks were shaken from several chimneys in Boston and other towns, and pieces of stone fence were thrown down in the country. Many persons were alarmed at Newbury and Ipswich, Massachusetts. The shock was reported from Falmouth, Maine, to New York City. Several aftershocks occurred.



http://earthquake.usgs.gov/earthquakes/ ... _18_hs.php

Cape Ann, Massachusetts
1755 11 18 09:11:35 UTC
Intensity VIII

Largest Earthquake in Massachusetts

This earthquake caused the heaviest damage in the region around Cape Ann and Boston. At Boston, much of the damage was confined to an area of infilled land near the wharfs. There, about 100 chimneys were leveled with the roofs of houses, and many others (1,200 to 1,500) were shattered and partly thrown down. Some chimneys, which were broken off below their tops, tilted dangerously 3 or 4 centimeters; others were twisted or partly turned. The gable ends of several brick buildings (12 to 15) were thrown down, and the roofs of some houses were damaged by the fall of chimneys. Stone fences were thrown down throughout the countryside, particularly on a line extending from Boston to Montreal. New springs formed, and old springs dried up. At Scituate (on the coast southeast of Boston), Pembroke (about 15 kilometers southwest of Scituate), and Lancaster (about 40 kilometers west of Boston), cracks opened in the earth. Water and fine sand issued from some of the ground cracks at Pembroke.

This earthquake was reported from Halifax, Nova Scotia, south to the Chesapeake Bay in Maryland and from Lake George, New York, east to a ship 320 kilometers east of Cape Ann. The shock was felt so strongly on the ship that those onboard believed the ship had run aground. Several aftershocks occurred.



It also ought to be mentioned that the last earthquake in that series, in 1755, struck only 17 days after a more well-known earthquake in the Atlantic Ocean destroyed Lisbon, Portugal.

Between three damaging earthquakes in three decades, and all the hurricanes the early settlers had to deal with in New England, and the Little Ice Age causing agricultural hardships.... man, that's not the Massachussetts we think we know today, is it?
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Re: 4.5 Quake off the coast of Massachusetts

#3 Postby somethingfunny » Thu Apr 12, 2012 9:19 am

I found these too:

Southeast Maine
1904 03 21 06:04 UTC
Mangitude 5.10
Intensity VII

Largest Earthquake in Maine

This strong earthquake overthrew chimneys in Washington County, in the area of Calais and Eastport, Maine, and at St. Stephen, New Brunswick. Felt throughout most of New England and the Provinces of New Brunswick and Nova Scotia. It was observed west to the Hudson River and Montreal, Canada, and south to southern Connecticut.



Moodus - East Haddam, Connecticut
1568 - Date Unknown
Intensity VI

The original source of the intensity data is the Massachusetts Historical Society Collection, 4th series, v 6, 1863, by R. Williams.


Near Moodus, Middlesex County, Connecticut
1791 05 16 13:00 UTC
Intensity VII

Largest Earthquake in Connecticut

The region around East Haddam, on the Connecticut River northeast of New Haven, has been the scene of a series of local disturbances since this country was settled. The region southeast of Middletown has been referred to in Indian tradition as Morehemoodus, or "place of noises." The first reported earthquake began on May 16 with two heavy shocks in quick succession. Stone walls were shaken down, tops of chimneys were knocked off, and latched doors were thrown open. A fissure several meters long formed in the ground. In a short time, 30 lighter shocks occurred, and more than 100 continued during the night. Reported felt at Boston, Massachusetts, and New York City, New York.



Near New York City, New York
1884 08 10 19:07 UTC
Magnitude 5.5
Intensity VII


•Isoseismal Map ( http://earthquake.usgs.gov/earthquakes/ ... 10_iso.php )

This severe earthquake affected an area roughly extending along the Atlantic Coast from southern Maine to central Virginia and westward to Cleveland, Ohio. Chimneys were knocked down and walls were cracked in several States, including Connecticut, New Jersey, New York, and Pennsylvania. Many towns from Hartford, Connecticut, to West Chester,Pennsylvania.

Property damage was severe at Amityville and Jamaica, New York, where several chimneys were "overturned" and large cracks formed in walls. Two chimneys were thrown down and bricks were shaken from other chimneys at Stratford (Fairfield County), Conn.; water in the Housatonic River was agitated violently. At Bloomfield, N.J., and Chester, Pa., several chimneys were downed and crockery was broken. Chimneys also were damaged at Mount Vernon, N.Y., and Allentown, Easton, and Philadelphia, Pa. Three shocks occurred, the second of which was most violent. This earthquake also was reported felt in Vermont, Virginia, and Washington, D.C. Several slight aftershocks were reported on August 11.



Crazy! :eek:
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