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15 July 2009 

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Typhoons Can Cause Slow Earthquakes, Taiwanese Scientists Think


14 July 2009

Scientists say that typhoons which hit Taiwan unleash slow earthquakes, a phenomenon that may save the island from devastating temblors.
People in Taiwan that have been knocked down to the ground by strong wind from a typhoon
People in Taiwan that have been knocked down to the ground by strong wind from a typhoon

Taiwan is often hit by strong typhoons, or tropical cyclones.

And while they are dangerous, typhoons help supply the island with water, but they also may do something else beneficial. Scientist believe typhoons may actually reduce the occurrence of catastrophic earthquakes.

Liu Chi-Ching of the Institute of Earth Sciences at Academia Sinica in Taipei and researchers from the Carnegie Institution in Washington, D.C., studied a section of a fault line off Taiwan's coast.

They were surprised to see that typhoons seem to affect the movement of the tectonic plates that meet at the fault.

Dr. Chi-Ching explains, "The decrease of the air pressure when typhoon comes, also decrease the pressure in the rock."

A typhoon causes a fall in atmospheric pressure, and the scientist researchers suggest that this in turn reduces pressure on the land over the fault.

One side of the fault lifts slightly, causing the pressure that has been building up inside to be released.

The gradual release of the pressure causes a slow earthquake, occurring over hours or days, reducing the likelihood of a violent earthquake.
Taiwanese rescuers clear rubble from a collapsed building after a 6.7 magnitude earthquake struck, in Pingtung County, 350 kilometers (217 miles) south west of Taipei (Dec 2006 file photo)
Taiwanese rescuers clear rubble from a collapsed building after a 6.7 magnitude earthquake struck, in Pingtung County, 350 kilometers (217 miles) south west of Taipei (Dec 2006 file photo)

Dr. Chi-Ching says, "There's another way other than a normal earthquake which we call slow earthquake which release a major part of energy in the crust. That would make us more relaxed because the possibility of big earthquake will be less."

Typhoon Lee is an Academia Sinica astrophysicist. He says the discovery adds another piece to the puzzle of earthquakes.

Dr. Lee expresses, "There is still some gap [on] how much energy you would have and how much energy released by earthquakes. I think we are on the right track. This is the first important result and certainly won't be the last."

Researchers will continue to study the fault line and hope to expand their research further along the same plate boundary in eastern Taiwan.


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