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
The India Meteorological Department said the quakes were 6.8 magnitude, 5.7 magnitude and 5.3 magnitude.
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
Two operating injection wells, just outside of the moratorium area, are about 8 miles from some of the quakes.
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.
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.
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 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
Solving the mystery is important because of suspicion the quakes could be related to natural gas exploration nearby using hydraulic fracturing, known as fracking, he said.
The quakes prompted state officials in January to order four fluid injection wells in the eastern part of the state to be "indefinitely" prohibited from opening.
The quakes struck near Tabriz, the country's fourth-largest city.
The Pacific Tsunami Warning Center said in a statement that "a destructive Pacific-wide tsunami is not expected" as a result of the quakes, and that there is no tsunami threat to Hawaii.
CNN: Three strong earthquakes strike Chile in quick succession
The quakes were strong enough to be felt in Milan, which is about 200 kilometers 125 miles from Bologna, the capital of Emilia Romagna, prompting schools and government buildings to be evacuated.
The study also said the "likely cause" of the quakes was an "unusual combination of geology at the well site" and said conditions which caused the minor earthquakes were "unlikely to occur again".
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And then there was the lack of electrical power -- the quakes cracked a hydroelectric power plant, forcing authorities to shut it down, making even a nearby airport unusable until portable generators could go online.
They found that when earthquakes struck in nearly the same place years or decades apart, seismic waves generated by the later quakes arrived in Alaska a little sooner than they had the time before.
BBC: NEWS | Science/Nature | Earth's core runs ahead of crust
The earthquake that devastated the Japanese coast and probably caused billions of dollars in damage was almost 10 times as powerful as the previous largest quakes to hit the island.
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The U.S. Geological Survey declined to say whether the two quakes were linked.
In the wake of Sunday's waves, there have been calls to set up a system that would monitor the Indian Ocean for undersea quakes and alert the countries around its rim.
This felt very different to the series of Manchester quakes we felt when we lived in the city in the mid-90s.
The classic theory breaks down because the faults where quakes are spawned are rarely found in isolation.
By using 3D seismic imaging he says, these problem could be identified and the risk of quakes avoided.
One notable missing quake on the list is the 2010 Haiti quake which killed more people than all the most powerful quakes combined.
At the heart of the scheme is the Central Planning Bureau, whose statisticians are so independent and so respected that the Dutch cabinet quakes when its annual economic forecasts are published.
The deaths, damage and recovery efforts came after a total of three quakes struck the region in rapid succession in a mountainous region.
If bursts occur within the Milky Way, the galaxy that contains the earth's solar system, they could be relatively small affairs quakes on the surfaces of neutron stars is one suggestion.
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