Submarine images have revealed that the Fukushima quake opened up cracks in the ocean floor as big as 6 feet wide. What effect this may have on future quakes in the area is unknown.

Coincidentally, shortly before the quake, researchers had taken photos of the same area of the seafloor where the crust would later rupture, leading to a tsunami that killed about 20,000 people. This meant that the seabed changes could be documented.

On the MSNBC website, Stephanie Pappas quotes seismologist Takeshi Tsuji as saying that his team of researchers saw open fissures in "many places," but how these cracks may effect future earthquakes along the same fault lines is unknown.
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How deep is the ocean’s capacity to buffer against climate change? Right now our oceans absorb almost one-third of all our greenhouse gas emissions. During the past three decades, increases in atmospheric carbon dioxide have largely been matched by corresponding increases in dissolved carbon dioxide in the seawater, but climatologists don’t know if the ocean can continue mopping up human-produced carbon at the same rate. Warmer water can’t hold as much carbon dioxide, so the ocean’s carbon capacity is decreasing as it warms.
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There are millions of tons of trash floating in our oceans, much of it plastic (meaning it won’t disappear anytime soon). Scientists are now trying to figure out how to clean it up. The largest "floating island" of plastic trash is in the North Pacific and covers an area twice the size of France. Other trash islands have been discovered in the North and South Atlantic, and scientists suspect that the same thing is taking place in the South Pacific and Indian Oceans. When this plastic floats towards a coastline, it affects tourism. It also kills fish that mistake it for food. Worst of all, contaminants in the water cling to the plastic and are then transported across the world’s oceans.read more