Iran straddles a major geological fault line, making it prone to seismic activity.

BBC: Iran: Dozens of aftershocks follow deadly earthquake

Geologists warn that the two earthquakes occurred on the same fault line, which may signal hyperactive seismic activity in the region, South China Morning Post reports.

BBC: China media: Quake donations debate

Indonesia sits atop a web of fault lines that makes the sprawling archipelago prone to volcanic and seismic activity.

WSJ: Southeast Asia Tsunami Alert Lowered