Portal:Earthquakes

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The geology of the Lassen volcanic area presents a record of sedimentation and volcanic activity in the area in and around Lassen Volcanic National Park in Northern California, U.S.. The park is located in the southernmost part of the Cascade Mountain Range in the Pacific Northwest region of the United States. Oceanic tectonic plates have plunged below the North American Plate in this part of North America for hundreds of millions of years. Heat from these subducting plates have fed scores of volcanoes in California, Oregon, Washington and British Columbia over at least the past 30 million years (see Geology of the Pacific Northwest) and is also responsible for activities in the Lassen volcanic area.

Between 3 and 4 million years ago, volcanic-derived mud flows called lahars streamed down several major mountains that included nearby but now extinct Mount Yana and Mount Maidu to become the Tuscan Formation. Basaltic and later andesitic to dacitic flows of lava covered increasingly larger areas of this formation to eventually form the lava plateau that the park sits on. About 600,000 years ago, Mount Tehama started to rise as a stratovolcano in the southwestern corner of the park, eventually reaching an estimated 11,000 feet (3,350 m) in height. Following a series of eruptions approximately 350,000 years ago, its cone collapsed into itself to form a two-mile (3 km) wide caldera.



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  • ...that the 1946 Nankaido earthquake caused a 5-6 meter (16-20 feet) tsunami that took out another 2,100 homes after the initial destruction of the earthquake?
  • ...that the 2003 Hokkaido earthquake was not given a cost in US dollars because it occurred offshore and did not cause as much damage as it would have on the mainland of Japan?

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Government study centers
United States Geological SurveyGNS ScienceIRIS Consortium

Seismic waves
Primary waveSecondary waveLove waveSurface waveRayleigh wave

Seismology and scales
SeismometerRichter scaleMercalli scaleMoment magnitude scaleRossi-Forel scaleJapan Meteorological Agency seismic intensity scaleMedvedev-Sponheuer-Karnik scaleEuropean Macroseismic Scale

Notable earthquakes
1556 Shaanxi earthquake1755 Lisbon earthquake1906 San Francisco earthquake1920 Haiyuan earthquake1960 Great Chilean Earthquake1964 Alaska earthquake1976 Tangshan earthquake2008 Sichuan earthquake2010 Haiti earthquake2011 Christchurch earthquake2011 Tohoku earthquake

Lua error in package.lua at line 80: module 'Module:Box-header/colours' not found. WikiProject Earthquakes is the central point of coordination for Wikipedia's coverage of earthquakes, seismology, tsunamis, and related subjects. Please feel free to join and help!

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