The United States Geological Survey (USGS) linked 114 remote earthquakes to the magnitude 8.6 East Indian Ocean quake that occurred April 11, 2012.
USGS seismologist Fred Pollitz and colleagues published their findings Sept. 26, 2012 in "Nature."
The study focused on global seismic activity triggered by the East Indian Ocean quake, according to a USGS press release.
The scientists found that the magnitude 8.6 earthquake triggered 114 earthquakes that were a magnitude 4.5 or greater in the six days following the quake.
As a result of the findings, the team is redefining the definition of an aftershock. Currently, the term aftershock refers to earthquakes that happen after and nearby the main fault rupture. The new definition will consider aftershocks to be earthquakes of any size and location that would not have taken place had the main shock not struck.
The difference in the two definitions is that an earthquake thousands of miles away can now be called an aftershock of the first earthquake if the seismic activity of the first quake can be determined to have caused the later quake.
After studying the seismic activity after the East Indian Ocean quake, the scientists determined that large earthquakes as far away as Mexico and Japan, in the following days, were actually aftershocks.
The East Indian Ocean was the largest, by a factor of 10, strike-slip earthquake ever recorded. A strike-slip earthquake is caused by two sections of tectonic plates sliding along each other horizontally with very little vertical movement.
"No other recorded earthquake triggered as many large earthquakes elsewhere around the world as this one," said Pollitz.
Remote earthquakes in the six days preceding (top) and the six days following (bottom) the M=8.6 main shock in the East Indian Ocean on April 11, 2012. The color scale indicates seismic stress, with purple = zero and red = high. This graphic is courtesy of USGS.gov.
A winter storm spreading a spreading a swath of snow and ice across the central U.S. will continue to impact travel through Saturday night before reaching the Northeast on Sunday.
As a large storm rolls out of the Plains and Midwest, a swath of snow, ice and travel disruptions will extend into the Northeast for the start of March.
A storm will whip across the United Kingdom and the North Sea through Sunday with potentially damaging and disruptive winds.
Yet another winter storm will take aim at the Northeast and Midwest next week with widespread ice and flooding concerns.
While more storms are on the horizon to start March, the accompanying cold shots will be less extreme.
An end to winter storms targeting Harrisburg will not come with the conclusion of February.
Buffalo, NY (1998)
Recorded it's warmest February on record with and average temperature of 34.1(F) which was 9.5(F) above normal. This broke the old record og 33.8(F) in 1984.
Impressive 48-hour snowfall totals in the Sierra: Chilkoot Meadow - 55" Poison Ridge - 44" Kaiser Point - 43" Wishon Dam - 39" Huntington Lake - 36" Lodgepole - 34"
Three tornadoes combined into one south of Colony, KS. Other tornadoes caused damage near Blue Mound, KS and Kingsville, MO and Blairstown, MO. Yates Center, KS had a thunderstorm wind gust of 70 mph, and baseball-sized hail pounded an area north of Amsterdam, MO.