This map shows 24 earthquakes between magnitude 4.5 and 5.4 that occurred in the Andaman Sea from 4 to 5 July 2022 (Universal Time). Additional smaller magnitude quakes also occurred. The most powerful event resulted from normal faulting along a northeast-southwest striking fault zone. Geographic and temporal clusters of earthquakes are known as "swarms". They usually occur over several days, but can have longer durations. Andaman Sea earthquake swarms have been previously reported - most of them involved normal faulting in the Andaman Back-Arc Basin.
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Some info. from:
Snehashis et al. (2022) - Characteristics of the earthquake swarms in the Andaman Sea region, India, from 1960 - 2020. Disaster Advances 15(3): 21-28.
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Map provided by the United States Geological Survey.
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See:
earthquake.usgs.gov/earthquakes/eventpage/us6000hzwa/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: Andaman Sea earthquake swarm July 2022 earthquakes swarms back arc backarc basin normal fault faults faulting map maps seismogram seismograms
This seismogram is from the Naypyitaw seismic station in Burma. The small areas of red and blue noise are from a cluster of earthquakes that occurred in the Andaman Sea from 4 to 5 July 2022 (Universal Time). The most powerful event was magnitude 5.4 (= 00:00 and 00:30 lines on the graph), which resulted from normal faulting along a northeast-southwest striking fault zone. Geographic and temporal clusters of earthquakes are known as "swarms". They usually occur over several days, but can have longer durations. Andaman Sea earthquake swarms have been previously reported - most of them involved normal faulting in the Andaman Back-Arc Basin.
--------------------------------
Some info. from:
Snehashis et al. (2022) - Characteristics of the earthquake swarms in the Andaman Sea region, India, from 1960 - 2020. Disaster Advances 15(3): 21-28.
--------------------------------
See:
earthquake.usgs.gov/earthquakes/eventpage/us6000hzwa/exec...
--------------------------------
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: Andaman Sea earthquake swarm July 2022 earthquakes swarms back arc backarc basin normal fault faults faulting seismogram seismograms
This seismogram is from the Chiang Mai seismic station in Thailand. The numerous areas of noise are from a cluster of earthquakes that occurred in the Andaman Sea from 4 to 5 July 2022 (Universal Time). The most powerful event was magnitude 5.4 (= 0:00 line on the graph), which resulted from normal faulting along a northeast-southwest striking fault zone. Geographic and temporal clusters of earthquakes are known as "swarms". They usually occur over several days, but can have longer durations. Andaman Sea earthquake swarms have been previously reported - most of them involved normal faulting in the Andaman Back-Arc Basin.
--------------------------------
Some info. from:
Snehashis et al. (2022) - Characteristics of the earthquake swarms in the Andaman Sea region, India, from 1960 - 2020. Disaster Advances 15(3): 21-28.
--------------------------------
See:
earthquake.usgs.gov/earthquakes/eventpage/us6000hzwa/exec...
--------------------------------
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: Andaman Sea earthquake swarm July 2022 earthquakes swarms back arc backarc basin normal fault faults faulting seismogram seismograms