article_snippet.sent: It occurred at a depth of 9.3 miles, which is considered shallow and more damaging than a deeper quake.
article_snippet.sent: This region is no stranger to earthquakes," Thomas Nybo, a freelance photographer said.
article_snippet.sent: Fast Facts on earthquakes .
article_snippet.sent: The U.S. Geological Survey had at first measured the strength at magnitude 7.5 but later upgraded The U.S. Geological Survey.
article_snippet.sent: A strong aftershock of magnitude 6.6 was recorded a little more than a half-hour afterward, along with nearly three dozen other aftershocks, the USGS reported.
article_snippet.sent: An official said they were felt there at magnitude 5.0.
article_snippet.sent: The shaking was rated as "strong" to "severe" on the USGS ShakeMap.
article_snippet.sent: How are earthquakes measured?