Natural DisastersNatural Disasters

By: Patrick L. Abbott

Chapter 5Chapter 5

More United States and Canadian Earthquakes

OverviewOverview

Western North America: Plate Tectonic-Related Earthquakes

Intraplate Earthquakes: “Stable” Central United States

Intraplate Earthquakes: Eastern United States

Overview (cont.)Overview (cont.)

Fracture-Zone Hypothesis of Major Earthquakes

Earthquakes and Volcanism in Hawaii

Western North America: Plate Western North America: Plate Tectonic-Related Tectonic-Related EarthquakesEarthquakes

Pacific Northwest: Oregon, Washington, and British Columbia Puget Sound, Washington, 1949 and 1965 Future Earthquakes in the Washington

RegionWestern Great Basin: Eastern California,

Western Nevada Owens Valley, California, 1872 The Western Great Basin Seismic Trend

Western North America: Plate Western North America: Plate Tectonic-Related Tectonic-Related Earthquakes Earthquakes (cont.)(cont.)

Intermountain Belt: Utah, Idaho, Wyoming, Montana Hebgen Lake, Montana, 1959 Borah Peak, Idaho, 1983 The Intermountain Seismic Belt

Rio Grande Rift: New Mexico, Colorado, Westernmost Texas, Mexico

Intraplate Earthquakes: Intraplate Earthquakes: “Stable” Central United “Stable” Central United StatesStates

New Madrid, Missouri, 1811-1812 Embayment

Reelfoot Rift: Missouri, Arkansas, Tennessee, Kentucky, Illinois

Ancient Rifts in the Central United States Failed Rift

Intraplate Earthquakes: Intraplate Earthquakes: Eastern United StatesEastern United States

New England Earthquakes Quicksand

St. Lawrence River Valley Earthquakes

Fracture-Zone Hypothesis of Fracture-Zone Hypothesis of Major EarthquakesMajor Earthquakes

Fracture zonesSeamountsCharleston, South Carolina, 1886

Earthquakes and Volcanism Earthquakes and Volcanism in Hawaiiin Hawaii

Harmonic tremorsCharacteristics