Geologic Hazards

Storm Surge can be the most damaging and deadly aspect of a hurricane.

Hurricane Names How are hurricanes named? Is your name on the list?

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?

Earthquakes - Learn about earthquakes and how they have affected cities and people.

Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.

Landslides A USGS fact sheet about landslides and events that trigger them.

Geology Dictionary - contains thousands of geological terms with their definitions.

Liquefaction occurs when water-saturated soil is severely shaken and loses strength.

Most Powerful Eruption of the 20th Century - and most people have never heard of it.

Abandoned Mines accidents take 20 to 30 lives per year. Many could be prevented.

Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined.

Volcanoes Articles about volcanoes, volcanic hazards and eruptions past and present.

What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.

World Record Lightning - This lake has more lightning than any other place in the world.

Largest Tsunami - The wave with the highest run-up was in Lituya Bay, Alaska.

Lightning Strikes Map - shows the worldwide distribution of lightning activity.

Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.

Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.

Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.

Atlantic Tsunamis Rare events that can cause damage and threaten millions of people.

Indian Ocean Tsunamis Deadly tsunamis triggered by earthquakes and volcanoes.

Pacific Tsunamis This ocean is surrounded by plate boundaries, that can produce tsunami.

Yosemite Rockfall Hazards have been mapped by the National Park Service.