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Major quakes spawn extra tremors across the globe

作者:挚烊臆    发布时间:2019-03-14 01:12:02    

By Jason Palmer No matter where they hit, large earthquakes can trigger a multitude of tiny tremors right across the globe. Geologists have long suspected that this was the case, the culprit being waves that travel along the Earth’s surface, including Love waves and Rayleigh waves. Now Aaron Velasco of the University of Texas at El Paso and colleagues have found that large earthquakes cause many more tiny tremors than previously thought. The team gathered data on 15 earthquakes of magnitude 7 or greater from more than 500 seismographic stations worldwide. In the 5 hours before the waves from a distant earthquake passed through these regions, the mean number of quakes detected globally was around 600. In the 48 minutes after the passage of Love waves, the average rate of these tremors rose by 37%; for Rayleigh waves, the jump was 60%. Roger Musson of the British Geological Survey says, “It means that this remote triggering is much more common than anyone supposed.” Journal reference: Nature Geoscience, DOI:

 

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