Draft:Earthquake
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Introduction
An earthquake is the shaking of the ground caused by a sudden release of energy in the Earth's lithosphere, usually along faults. The energy propagates as seismic waves, which can lead to ground deformation, damage to buildings and infrastructure, and secondary hazards such as tsunamis and landslides. Earthquakes are typically quantified by their magnitude (energy released) and localized by their epicenter and hypocenter (focus).
Table of contents
Causes
Earthquakes most commonly occur due to the interaction of tectonic plates. Along plate boundaries, stress accumulates as plates lock, then is released when the fault slips, generating seismic waves. Common tectonic settings include:
- Convergent boundaries (subduction and continental collision)
- Divergent boundaries (rift zones)
- Transform boundaries (strike-slip faults)
Other causes include volcanic earthquake activity, induced seismicity from activities such as reservoir impoundment, mining, and hydraulic fracturing, and impacts from meteorites (rare).
Seismic waves
Seismic energy radiates through the Earth as waves:
- Body waves: travel through the Earth’s interior.
- P-waves (primary waves) are compressional and arrive first.
- S-waves (secondary waves) are shear waves and arrive after P-waves.
- Surface waves: travel along the Earth’s surface and are often responsible for the strongest shaking.
- Love waves and Rayleigh waves are prominent surface wave types.
Magnitude and intensity
Earthquake size is often reported using magnitude scales, such as:
- Moment magnitude (Mw)
- Surface-wave magnitude (Ms)
- Body-wave magnitude (mb)
Different scales capture different measurement approaches. The intensity of shaking at a specific location is commonly described by scales such as the Modified Mercalli Intensity (MMI), which relates observed effects (e.g., damage) to shaking levels.
Faulting and rupture
Fault rupture involves the movement of two sides of a fault. Key concepts include:
- Slip and rupture plane geometry
- Rupture propagation (how the rupture spreads)
- Foreshocks (smaller events preceding a mainshock)
- Aftershocks (events occurring after the mainshock)
Earthquake sequences can be complex, and aftershock activity can persist for days to years depending on the event and region.
Tsunami and secondary hazards
Large undersea earthquakes can displace the seafloor and generate tsunamis. Other secondary hazards include:
- Landslides triggered by strong shaking
- Liquefaction of saturated soils
- Structural fires due to damaged utilities
- Ground rupture where faults reach the surface
Preparedness and safety
Preparedness reduces risk from earthquakes. Common measures include:
- Earthquake preparedness planning (family checklists and evacuation routes)
- Building seismically retrofitting and building code compliance
- Drop, Cover, and Hold On guidance during shaking
- Public education and emergency communication systems
Monitoring and prediction
Seismologists use seismometers and seismographs to detect and record ground motion. Networks enable rapid estimation of epicenter, depth, and magnitude. While short-term forecasting remains challenging, some regions study statistical patterns and earthquake forecasting methods. Predicting exact time, location, and magnitude is not currently reliable for operational use, but risk can be assessed through seismic hazard analysis.
Notable earthquakes
See also
References
External links
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