This is a seismogram for the Fish Springs seismic station in western Utah, USA. The noise at left was caused by a magnitude 3.0 earthquake that hit northern Nevada at 8:59 PM, local time, on 20 January 2022. The epicenter was on the western flanks of the Independence Mountains, 16 to 17 kilometers north-northwest of the town of Carlin, Nevada. The hypocenter was about 10 kilometers deep.
Nevada has numerous faults that border its mountain ranges (horsts) and extensive valleys (grabens). This region of North America, referred to as the Basin and Range Physiographic Province, has experienced significant crustal extension throughout the Cenozoic Era.
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See info. at:
earthquake.usgs.gov/earthquakes/eventpage/nn00832115/exec...
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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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See info. at:
earthquake.usgs.gov/earthquakes/eventpage/nn00788443/exec...
Tags: Independence Mountains Nevada magnitude 3.0 earthquake earthquakes quake quakes 20 January 2022 seismogram seismograms
This is a seismogram from the SANAE IV Station in Antarctica ["SANAE" means the South African National Antarctic Expedition]. The blue noise is from a magnitude 6.5 earthquake in the far-southern Atlantic Ocean (actually, just into the Antarctic Ocean). The quake hit at 2:03 AM, local time, on 29 September 2022. The epicenter was near the eastern end of the South Sandwich Transform Fault, but shaking resulted from normal faulting along a ~northeast-southwest striking fault zone.
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Info. at:
earthquake.usgs.gov/earthquakes/eventpage/us6000ip57/exec...
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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.
Tags: North Weddell Ridge magnitude 6.5 earthquake earthquakes quake quakes 29 September 2022 normal fault faults faulting South Sandwich Transform Fracture Zone seismogram seismograms
This is a seismogram from the Monasavu seismic station in Fiji. The noise is from a magnitude 6.3 offshore earthquake that hit south of Vanuatu and southwest of Fiji (= western Pacific Ocean). The quake occurred at 6:50 AM, local time, on 1 April 2022. The epicenter was about 377 kilometers ~east of the southeastern end of New Caledonia. Shaking resulted from thrust faulting along a west-northwest to east-southeast striking fault zone. This was a powerful aftershock that followed a magnitude 7.0 quake the previous day in the same area. These events occurred during an Earth-Moon-Sun alignment.
This was a subduction zone earthquake. Subduction zones have tectonic plates composed of oceanic lithosphere diving underneath another tectonic plate. In this case, the Australian Plate is subducting eastward beneath the Pacific Plate along a deep seafloor trough called the New Hebrides Trench (a.k.a. South New Hebrides Trench).
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Info. at:
earthquake.usgs.gov/earthquakes/eventpage/us7000gysz/exec...
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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.
Tags: New Hebrides Trench magnitude 6.3 earthquake earthquakes quake quakes 1 April 2022 subduction zone zones thrust fault faults faulting seismogram seismograms
This map shows a cluster of 23 earthquakes that occurred from 11 to 12 February 2022 in Yellowstone, Wyoming, USA. The most powerful event was magnitude 2.7 (later recalculated to 1.9). Clusters of earthquakes are called "swarms". Frequent activity started at about 9:00 PM, local time, on 11 February 2022. Activity appeared to cease around 7 AM, local time, on 12 February 2022. At least three quakes were felt by rangers near Old Faithful Geyser. The swarm occurred west of & in the Lone Star Geyser Basin area, which is south of Yellowstone's Upper Geyser Basin. The seismogram is from the Old Faithful seismic station - it records numerous additional microquake events.
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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.
Tags: Yellowstone Wyoming earthquake earthquakes quake quakes swarm swarms February 2022 Old Faithful Lone Star Geyser Basin 11 12 seismogram seismograms
This seismogram is from the Resolute seismic station on Cornwallis Island, Arctic Canada. The noise is from a magnitude 4.8 offshore earthquake in the Byam Martin Channel in Arctic Canada. The quake hit at 1:59 AM, local time, on 5 November 2022. The epicenter was offshore from the eastern shoreline of Melville Island & about 33 kilometers north-northwest of the northernmost point on Byam Martin Island. Two other quakes of magnitude 4.7 and 4.8 occurred in Byam Martin Channel in the previous two days. Earthquakes in this area are uncommon.
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Info. at:
earthquake.usgs.gov/earthquakes/eventpage/us7000imni/exec...
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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.
Tags: Arctic Canada magnitude 4.8 earthquake earthquakes quake quakes 5 November 2022 Byam Martin Channel seismogram seismograms