No damage had been reported, but residents of Istanbul said aftershocks continued to shake the city of 16 million.

A moderately strong, 5.1-magnitude earthquake struck in Australia on Wednesday, according to the United States Geological Survey. The temblor happened at 2:55 a.m. Australian Eastern time about 19 ...

Yellowstone Caldera, the volcanic complex underneath Yellowstone National Park, is held at bay from eruption by a cap 3.8 ...