More than two dozen quakes recorded since Wednesday have been centered north of Morrilton, Arkansas.
In both sites, houses which had been designed to withstand quakes had been built.
There, some 70% of the buildings, already weakened by three months of quakes, collapsed.
At a depth of less than 10 kilometers (6 miles), both quakes were shallow.
CNN: More than 300 killed, 3,000 injured in Iran earthquakes
The US Geological Survey registered the two strongest of the quakes at 5.6 magnitude.
BBC: China earthquake death toll rises in Yunnan and Guizhou
Today, Banda Aceh is rattled by quakes sometimes two to three times a week.
Both these quakes were under an 8.0 magnitude, and neither made the list.
The India Meteorological Department said the quakes were 6.8 magnitude, 5.7 magnitude and 5.3 magnitude.
According to this data, the return period for M5 quakes for New York is 100 years.
The researchers hunted for quakes with nearly identical patterns of peaks and troughs on a seismograph reading.
BBC: NEWS | Science/Nature | Earth's core runs ahead of crust
For the wave shapes to match, the quakes must have taken place less than a kilometre apart.
BBC: NEWS | Science/Nature | Earth's core runs ahead of crust
The classic theory breaks down because the faults where quakes are spawned are rarely found in isolation.
Two major quakes in Iran on Saturday killed at least 300 and left widespread destruction with thousands injured.
Two operating injection wells, just outside of the moratorium area, are about 8 miles from some of the quakes.
By using 3D seismic imaging he says, these problem could be identified and the risk of quakes avoided.
Both were hit by quakes in the 1980s, were reconstructed, and hit again.
More than 730 people were injured after the quakes hit Yunnan and Guizhou provinces on Friday, state media say.
BBC: China earthquake death toll rises in Yunnan and Guizhou
The quakes struck near Tabriz and Ahar, but most of the casualties are thought to be in outlying villages.
The U.S. Geological Survey declined to say whether the two quakes were linked.
Many of the quakes in the UK are clustered around an enormous block of rock known as the Midlands Microcraton.
Rolando Santos, senior vice president and general manager of CNN Chile, said he and his colleagues felt one of the quakes.
CNN: Three strong earthquakes strike Chile in quick succession
The quakes set off landslides, which -- along with heavy rains -- were blocking roads and hampering rescue efforts, Pandey said.
This felt very different to the series of Manchester quakes we felt when we lived in the city in the mid-90s.
If I don't leave Bologna, I will never feel safe because we are still having quakes every three or five minutes.
Wastewater injection from drilling operations has been linked to seismic events in the past, but these have typically been much smaller quakes.
BBC: Oklahoma earthquake linked to oil extraction wastewater
Scores of villages were destroyed or damaged by the quakes, which struck East Azarbaijan province northeast of Tabriz, the country's fourth-largest city.
CNN: More than 300 killed, 3,000 injured in Iran earthquakes
The US Geological Service measured the quakes at magnitude 6.4 and 6.3.
The deaths, damage and recovery efforts came after a total of three quakes struck the region in rapid succession in a mountainous region.
One notable missing quake on the list is the 2010 Haiti quake which killed more people than all the most powerful quakes combined.
The quakes damaged historic monuments, including the roof of Shahabeddin Ahari's tomb and the Qasem Khan Ahari house, among other sites, Press TV said.
CNN: More than 300 killed, 3,000 injured in Iran earthquakes
应用推荐