Mayacamas Mountains, California earthquakes (20 December 2021 to 20 January 2022)

This map shows one month's worth of earthquakes in "The Geysers" area of northern California's Mayacamas Mountains. Between 1150 and 1200 quakes are depicted here. They occurred from 20 December 2021 to 20 January 2022. Magnitudes ranged from -0.3 to +2.7. This seismicity is not natural - these small "induced earthquakes" are an ongoing consequence of persistent fluid injection activity at geothermal power plants.
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See info. at:
en.wikipedia.org/wiki/The_Geysers
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An earthquake is a natural shaking or vibrating of the Earth caused by sudden fault movement and a rapid release of energy. Earthquake activity is called "seismicity". The study of earthquakes is called "seismology". The actual underground location of an earthquake is the hypocenter, or focus. The site at the Earth's surface, directly above the hypocenter, is the epicenter. Minor earthquakes may occur before a major event - such small quakes are called foreshocks. Minor to major quakes after a major event are aftershocks.

Most earthquakes occur at or near tectonic plate boundaries, such as subduction zones, mid-ocean ridges, collision zones, and transform plate boundaries. They also occur at hotspots - large subsurface mantle plumes (Examples: Hawaii, Yellowstone, Iceland, Afar).

Earthquakes generate four types of shock waves: P-waves, S-waves, Love waves, and Rayleigh waves. P-waves and S-waves are body waves - they travel through solid rocks. Love waves and Rayleigh waves travel only at the surface - they are surface waves. P-waves are push-pull waves that travel quickly and cause little damage. S-waves are up-and-down waves (like flicking a rope) that travel slowly and cause significant damage. Love waves are side-to-side surface waves, like a slithering snake. Rayleigh waves are rotational surface waves, somewhat like ripples from tossing a pebble into a pond.

Earthquakes are associated with many specific hazards, such as ground shaking, ground rupturing, subsidence (sinking), uplift (rising), tsunamis, landslides, fires, and liquefaction.

Some famous major earthquakes in history include: Shensi, China in 1556; Lisbon, Portugal in 1755; New Madrid, Missouri in 1811-1812; San Francisco, California in 1906; Anchorage, Alaska in 1964; and Loma Prieta, California in 1989.

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Taken on: January 21, 2022

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Mayacamas

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Sets appears in: • 2022 Earthquakes • 2021 Earthquakes more » • Artificial & Non-Seismic Earthquakes • California area Earthquakes • Earthquakes « less

Groups appears in: • Earth Science Teaching Resource

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