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Originally posted by ddarkangle2bad
Blasts of lava and ash shot out of a volcano in southern Iceland on Monday and small tremors rocked the ground
Scientists say history has proven that when the Eyjafjallajokull volcano erupts, Katla follows, the only question is how soon. And Katla, located under the massive Myrdalsjokull icecap, threatens disastrous flooding and explosive blasts when it blows.
forced at least 500 people to evacuate.
An eruption at the Katla volcano could be disastrous, however both for Iceland and other nations.
Iceland's Laki volcano erupted in 1783, freeing gases that turned into smog. The smog floated across the Jet Stream, changing weather patterns. Many died from gas poisoning in the British Isles. Crop production fell in western Europe. Famine spread. Some even linked the eruption, which helped fuel famine, to the French Revolution. Painters in the 18th century illustrated fiery sunsets in their works.
There are three main places where volcanoes normally occur — along strike-slip faults such as California's San Andreas fault line
The Salton Buttes consist of five small rhyolitic lava domes extruded onto Quaternary sediments of the Colorado River delta within the Salton Sea geothermal field at the SE margin of the Salton Sea. The summit of The age of the Salton Buttes has variously been considered to be late Pleistocene or early Holocene based on different dating techniques. Recent dating of young zircons (which typically crystallize prior to eruption) at 10,300 +/- 1000 years Before Present (BP) is consistent with early Holocene hydration rind dates from Obsidian Butte. Wave-cut benches originating from Lake Cahuilla, which existed from about 20,500 to 3000 BP prior to the 20th century formation of the Salton Sea due to an accidental spill-over of the Colorado River, are found on all of the domes. Older, sediment-buried Pleistocene rhyolitic lava domes have been found in geothermal drill holes. The Salton Sea geothermal field produces saline geothermal brines.
Unlike the powerful volcanoes along the Pacific Rim where the slow rise of magma gives scientists early seismic warnings that an eruption is imminent, Iceland's volcanoes are unique in that many erupt under ice sheets with little warning.
Using thermal cameras and radar to map the lava flow, Gudmundsson and other scientists were able to determine that the lava from Eyjafjallajokull was flowing down a gorge and not moving toward the ice caps — reducing any threat of floods.