The latest bursts of molten rock, ash and toxic gas from Mount Kilauea on the Big Island of Hawaii are part of an ever-changing and still largely mysterious cycle of eruptions that have been at work for hundreds of thousands of years.
Kilauea, one of the world's most active volcanoes and perhaps the most intensely studied, began extruding red-hot lava into populated areas through newly opened fissures in the ground last week, destroying dozens of homes and other buildings, and prompting mass evacuations.
The lava-spewing fissures were accompanied by a flurry of earthquakes. An ash plume belched from Kilauea's long-active Pu'u 'O'o side vent last week, and on Wednesday volcanic rock exploded from the main summit crater, which could portend a wave of similar eruptions to come.