West Virginia magnitude 2.0 earthquake (8:36 PM, 9 August 2022)

This seismogram is from Marlinton seismic station in West Virginia, USA. The blue noise was caused by a small, magnitude 2.0 earthquake in southeastern West Virginia. The quake hit at 8:36 PM, local time, on 9 August 2022. The epicenter was at Brushy Mountain, west of the town of Minnehaha Springs, West Virginia. The hypocenter was between 10 and 15 kilometers deep.

Earthquakes in eastern America are uncommon and usually small to moderate in magnitude, while strong quakes are rare. This earthquake occurred in the Appalachian Mountains, in the Valley and Ridge Physiographic Province. The area principally consists of folded sedimentary rocks. The Appalachians formed by tectonic collision between Africa and North America during the Pennsylvanian Period. Numerous faults occur throughout the mountains and the modern stress field causes some of them to move occasionally, producing earthquakes.
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Info. at:
earthquake.usgs.gov/earthquakes/eventpage/se60158843/exec...
and
en.wikipedia.org/wiki/Ridge-and-Valley_Appalachians
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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: August 10, 2022

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