Presentation on theme: "DANGEROUS VOLCANOES IN THE WORLD A RE-ERUPTION OF 11 OF THE 1,500 ACTIVE VOLCANOES IS LIKELY TO BE VERY DEVASTATING, LOCALLY, REGIONALLY, AND GLOBALLY."— Presentation transcript:
DANGEROUS VOLCANOES IN THE WORLD A RE-ERUPTION OF 11 OF THE 1,500 ACTIVE VOLCANOES IS LIKELY TO BE VERY DEVASTATING, LOCALLY, REGIONALLY, AND GLOBALLY Dr. Walter Hays, Global Alliance For Disaster Reduction
11 VOLCANOES THE WORLD HOPES WILL NOT ERUPT AGAIN Eyjafjallajökull and Katla (ICELAND) Chaiten Krakatau Merapi Vesuvius Pinatubo Mount Rainier Nevada del Ruiz Popocatepl Nyirangongo (CONGO)
WHAT MAKES A VOLCANO ESPECIALLY DANGEROUS Location and a large explosivity index (VEI) combine to make some volcanoes especially dangerous.
LOCATION NEAR CITIES MAKES SOME VOLCANOES VERY DANGEROUS An eruption at some locations is certain to be devastating to people, their property, their health, the community infra- structure, the environment, and the economy.
The Eyjafjallajökull and Katla Volcanoes: Southern Iceland
The 800-meter fissure caused by the first eruption, which grew to 1.2 km in the second eruption, could be heading towards the Myrdalsjokall glacier, which sits atop the powerful Katla volcano
An eruption of the Katla volcano, located under the massive Myrdalsjokull icecap, could cause disastrous local flooding, explosive blasts, and eruption clouds that would disrupt air traffic between Europe and the USA.
CHAITEN ERUPTED AFTER 8,000- 10,000 YEAR DORMANCY THE 1,200 M (3,550 FT) VOLCANO SENT ASH HIGH INTO THE SKY. “VOLCANIC EARTHQUAKES WERE TRIGGERED IN THE AREA. 1,500 RESIDENTS EVACUATED, MOSTLY BY BOAT
Krakatau 26-27 August, 1883 The big one! http://www.geology.sdsu.edu/how_volcanoes_work/Krakatau.html
The 1883 Krakatoa Eruption ! Anak Krakatoa—Son of Krakatoa