A cluster of earthquakes, including one measuring 6.1 magnitude, hit Taiwan on Tuesday, the U.S. Geological Survey reported. No damage or casualties were initially reported. The quakes occurred after a 7.4 magnitude quake struck earlier this month, causing 13 deaths and injuring over 1,000. Taiwan is frequently affected by earthquakes, but its excellent earthquake preparedness and strict construction standards have helped minimize their impact on its 23 million residents.