Home » Geologic Hazards
Storm Surge can be the most damaging and deadly aspect of a hurricane.
Earthquakes - Learn about earthquakes and how they have affected cities and people.
Landslides A USGS fact sheet about landslides and events that trigger them.
Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Volcanoes Articles about volcanoes, volcanic hazards and eruptions past and present.
Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.
What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.
Liquefaction occurs when water-saturated soil is severely shaken and loses strength.
Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined.
Hurricane Names How are hurricanes named? Is your name on the list?
Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.
Most Powerful Eruption of the 20th Century - and most people have never heard of it.
World Record Lightning - This lake has more lightning than any other place in the world.
Abandoned Mines accidents take 20 to 30 lives per year. Many could be prevented.
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Rock Fall Photos
Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.
Largest Tsunami - The wave with the highest run-up was in Lituya Bay, Alaska.
Lightning Strikes Map
Lightning Strikes Map - shows the worldwide distribution of lightning activity.
Atlantic Tsunamis Rare events that can cause damage and threaten millions of people.
Yosemite Rockfall Hazards have been mapped by the National Park Service.
Pacific Tsunamis This ocean is surrounded by plate boundaries, that can produce tsunami.
Indian Ocean Tsunamis
Indian Ocean Tsunamis Deadly tsunamis triggered by earthquakes and volcanoes.