article_snippet.sent: (CNN)Saturday's deadly earthquake in Nepal was the "big one" experts were waiting for based on the region's history.
article_snippet.sent: Earthquakes are a fact of life in the South Asian country, with tremors of magnitude 4 or 5 occurring several times each year, Ravilious said.
article_snippet.sent: With the last major earthquake in 1934, Ravilious was not if, but when the next "great" earthquake would hit, said Ravilious, author of the 2014 article, "Kathmandu's earthquake nightmare.
article_snippet.sent: The big unknown is what happens next, now that the initial rumbles of the quake have passed, Ravilious said.
article_snippet.sent: An earthquake is the ground shaking caused by a sudden slip on a fault, according to the U.S. Geological Survey.
article_snippet.sent: Stresses in the earth's outer layer push the sides of the fault together, releasing energy in waves that travel through the earth's crust and cause the shaking felt during an earthquake.
article_snippet.sent: India is moving northward into Eurasia at a rate of about 45 millimeters a year, with earthquakes of a magnitude from 8 to 9 occurring on average in the Himalaya every 500 to 1,000 years, said Clark.
highlights_snippet.sent: Earthquake scientists have been expecting major event in Nepal since 1934 .
  