<p>It struck some 100 kilometers east-southeast of Adak, one of the Andreanof Islands group that make up part of Alaska's Aleutian Islands.<br /><br />The second struck shortly afterwards, at 0349 GMT, just five miles further out to sea.<br />With a harsh climate, Adak is a sparsely populated island home to no more than a few hundred residents.<br /><br />The Aleutian Islands are frequently rattled by strong quakes. A 6.4-magnitude quake shook the Andreanof Islands in August this year.</p>
<p>It struck some 100 kilometers east-southeast of Adak, one of the Andreanof Islands group that make up part of Alaska's Aleutian Islands.<br /><br />The second struck shortly afterwards, at 0349 GMT, just five miles further out to sea.<br />With a harsh climate, Adak is a sparsely populated island home to no more than a few hundred residents.<br /><br />The Aleutian Islands are frequently rattled by strong quakes. A 6.4-magnitude quake shook the Andreanof Islands in August this year.</p>