Indonesia volcano Mount Merapi has erupted just before dusk on Tuesday. Scientists have warned that pressure building beneath Merapi's lava dome could trigger one of the most powerful blasts in years.
Every time in recorded history that Eyjafjallajökull volcano has erupted, the much larger Katla volcano has also erupted. Scientists are watching Katla carefully.
A TV grab from Telesur shows an image of Chilean President Michelle Bachelet (R) speaking to journalist and another of damages caused by a huge 8.8-magnitude earthquake that rocked Chile early killing at least 78 people, on February 27, 2010. The massive quake plunged much of the Chilean capital, Santiago, into darkness as it snapped power lines and severed communications, and AFP journalists spoke of walls and masonry collapsing. People in pyjamas fled onto the streets.
The Samoa tsunami demonstrates a problem for early warning systems - massive waves crashed ashore before researchers could analyze the earthquake and sound the alarm. A second earthquake struck near Samoa Wednesday, where the death toll has topped 150.