Natural Disasters Ch. 7

Mt. Rainier, Washington, is number one on the danger list of many U.S. volcanologists because of its __________.

all of the above

Violent causes of death from volcanic eruptions include _______________.

all of the above

A genuine success story of advance warning before a large eruption occurred in the Philippines in 1991 before the climactic eruption of _________________.

Mt. Pinatubo

In 1985, __________ produced a minor eruption that melted part of a glacier near its summit, sending a lahar down its slopes and killing at least 22,000 people.

Nevado Del Ruiz, Colombia

Why are low latitudes the most dangerous latitudes to have a large volcanic eruption occur?

Ash and gases from low-latitude eruptions are spread around Earth to the greatest degree.

What was the origin of the gas that killed 1,700 people in Cameroon in 1996?

It leaked upward from basaltic magma underlying a lake.

In 1883, __________ exploded and the resulting tsunami killed 36,000 people on Java and Sumatra.

Krakatau

During the summer of 1783, the greatest lava eruption of historic times poured forth at _________, accompanied by the release of an enormous volume of gases that enshrouded much of northern Europe in a "dry fog" or blue haze rich in SO2 (one of the visible components of today's urban smog).

Laki, Iceland

In the United States, there was great concern in the early 1980s when earthquakes were frequent, including harmonic tremor, and four magnitude 6 earthquakes caused damage near __________.

Long Valley Caldera in California (CA)

On 8 May 1902, a massive eruption of __________ killed 30,000 people in the town of St. Pierre.

Mont Pelée, Martinique

Seafloor spreading generates __________ magma.

basaltic

In August 1986, a gigantic volume of __________ belched forth from Lake Nyos in Cameroon and swept down the adjacent valleys asphyxiating 1,700 people.

carbon dioxide

Several geologic phenomena are being studied as signs of an impending volcanic eruption. These include seismic waves, ______________, and the release of gases.

ground deformation

Most of the people killed by the Mount St. Helens eruption of 1980 __________.

had gone around barriers meant to keep people out of 'harms' way

Mt. Pinatubo endangered people, animals, and property when its 1991 eruption resulted in __________.

lahars and pyroclastic flows

Active volcanoes today in Oregon and Washington, including Mt. St. Helens, result from _________________.

the subduction of the Juan de Fuca Plate beneath North America