two of mexico's dangerous volcanoes are threatening to erupt
TRANSCRIPT
Popocatapatele and Colima,
two of Mexico’s volcanoes,
are acting up again
February 5, 2015
For now the eruptions are not
considered to be dangerous and no
evacuations have been ordered.
11 VOLCANOES THE WORLD
HOPES WILL NOT ERUPT AGAIN
• Eyjafjallajökull
and Katla
(ICELAND)
• Chaiten
• Krakatau
• Merapi
• Colimas
• Vesuvius
• Pinatubo
• Mount Rainier
• Nevada del Ruiz
• Popocatepl
• Nyirangongo
(CONGO)
A RE-ERUPTION OF ANY
OF THESE ACTIVE
VOLCANOES IS LIKELY TO
BE VERY DEVASTATING,
LOCALLY, REGIONALLY,
AND GLOBALLY
LATERAL BLAST
VOLCANIC
ERUPTIONS
PYROCLASTIC FLOWS
FLYING DEBRIS
VOLCANIC ASH
LAVA FLOWS
LAHARS
TOXIC GASES
CAUSES
OF RISK
DISASTER
LABORATORIES
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 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
INDONESIA’S MOUNT MERAPI
ERUPTED IN MAY & JUNE, 2006
• Mount Merapi
emitted lava,
debris, and a
pyroclastic flow
on May 15, but
this one was
not devastating.
Mount Somma-Vesuvius• Location: Bay
Naples, east of the city of Naples, Italy
• Last eruption: March, 1944
Pinatubo was the second largest
eruption of the 20th century and the
largest to impact a densely
populated area.
The lahar generated by the eruption
of Nevada del Ruiz buried 25,000
people in the city of Armero as they
slept.