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It's possible. According to a study in Nature (June 2009), typhoons in the South Pacific Ocean sparked small earthquakes along the fault between the Philippine Sea Plate and the Eurasian Plate. However, the study pointed out that the storms did not cause the earthquakes, but only accelerated their timing - the earthquakes would have happened anyway.
There was also a University of Miami study (December 2010) which linked the Haiti earthquake of January 2010 to the strong tropical storms in the region in 2008. This is a new scientific theory which could be wrong, but there's definitely evidence that some storms can cause earthquakes.
I can not see the direct correlation between a storm and an earthquake...
Earthquakes are caused by a move in the tectonic plates (huge plates that form part of the Earth's crust). These are always on the move, and when they have moved enough against one another, there is a huge outleash of kinetic energy (a bit like an elastic band breaking) and one plate moves above the other causing massive vibrations which creates the earthquake.
This all happens at ground level, and the level of the forces are massive (far more than a storm, even though on ground level, the forces might seem immense). Relatively speaking it would be like trying to repel a massive body of water by trying to blow on it....
I am sure that there is a connection however between storms and earthquakes, but would never say that a storm created an earthquake
Now, scientists in the United States and Taiwan have examined slow earthquake events in eastern Taiwan that occurred between 2002 and 2007. They found that 11 out of 20 slow quakes coincided with typhoons — tropical cyclones that originate in the northwest Pacific Ocean. During typhoons, the atmospheric pressure on land is reduced, and at least in the case of eastern Taiwan, this pressure change seems to be enough to unclamp a fault that is under strain and to cause a fault failure.
Although the Cascadia region is not affected by typhoons, it does experience extensive low-pressure atmospheric systems that could produce small stress changes within the crust. These might be similar to those occurring in eastern Taiwan, says Herb Dragert, a geophysicist with the Geological Survey of Canada in Sidney, British Columbia, who was not involved in the study. To date, no one has investigated whether atmospheric pressure changes could be triggering ETS events, says Dragert. But the similarity between this latest study and previous ones, he notes, is that "very small stress changes can initiate this kind of slow slip and slow earthquake phenomenon".
In most years, the dark clouds over western Oklahoma in the spring would be bringing rain. This year, they're more likely to be smoke from wildfires that have burned thousands of acres in the past month as the state and its farmers struggle with a severe drought.
5.6-mag Oklahoma Quake
Oklahomans more accustomed to tornadoes than earthquakes suffered through a weekend of temblors that cracked buildings, buckled a highway and rattled nerves. One jolting quake late Saturday was the state's strongest ever and shook a college football stadium 50 miles away while another of lesser intensity struck before dawn Sunday
It is possible and likely that atmospheric pressure changes can trigger earthquakes. It is possible the 2.9 was triggered by the lowered atmospheric pressure. It is also possible the two are just coincidences. It takes more than a 6,000 magnitude three earthquakes to alleviate the forces that would cause a magnitude 5.6 so it is really hard to reduce the likelihood of a large earthquake with smaller ones. However, it is possible the drought itself by reducing the amount of ground water could have triggered the 5.6. The tornado track Sunday went past five stations and left a strong signal on these instruments of both wind noise and atmospheric pressure changes. Austin Holland