A magnitude 6.1 earthquake occurred in Turkey’s northwestern province of on Sunday evening, sending shocks that were felt some 200 kilometers (125 miles) away in Istanbul.

Porto, the hub of northern Portugal, is a prime example of a national “second city.” ...

A 6.2-6.4 magnitude earthquake struck Russia's Kuril Islands amid ongoing seismic unrest following a massive 8.8-magnitude earthquake on July 30.