Geophysical imaging

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Example of a 2D and 3D model created using geophysical imaging techniques.[1]

Geophysical imaging (also known as geophysical

subsurface of a terrestrial planet.[2][3] Geophysical imaging is a noninvasive imaging technique with a high parametrical and spatio-temporal resolution.[4] It can be used to model a surface or object understudy in 2D or 3D as well as monitor changes.[4]

There are many applications of geophysical imaging some of which include imaging the lithosphere and imaging glaciers.[5][6] Many different techniques exist to perform geophysical imaging including seismic methods, electrical resistivity tomography, ground-penetrating radar, etc.

Types of geophysical imaging:

Applications

Imaging the Lithosphere

Some geophysical imaging techniques for the Earth's lithosphere and upper mantle include teleseismic tomography, surface-wave tomography, gravity modeling, and electromagnetic methods.[5] Geophysical imaging techniques can be combined to create a more accurate image of the lithosphere. The techniques used to image the lithosphere can be used to map out the thermostructure of the Earth. In turn, the thermostructure reveals near surface processes such as seismicity, magma emplacement, and mineralization events. The ability to image the thermostructure could also reveal geophysical observables like gravity and information about tectonic plates like plate velocity and strain partitioning.

Alpine Rock Glaciers

Geophysical imaging techniques have been applied to alpine rock glaciers to better understand mountain permafrost and perform hazard-mitigation measures.[6] The types of geophysical imaging used include: diffusive electromagnetic, geoelectric, seismic tomography, and ground-penetrating radar. In fact, the first use of ground-penetrating radar was to determine a glacier's depth in 1929.[3] Two dimensional geophysical imaging techniques have recently allowed for 2D imaging of mountain permafrost.[6]

Types of geophysical imaging

Seismic Methods

Seismic methods utilize elastic energy created by natural and artificial sources to create an image of the subsurface.

s-waves, that bend through velocity gradients. Tracking differences in velocity of the p-waves and s-waves can be useful because s-wave's velocity react differently to fluid saturation and fracture geometry. Reflection and refraction seismic methods exploit the waves that can be produced by sledgehammer, explosives, weight drops, and vibrators to image the subsurface. The third seismic method, surface wave methods, look at the surface waves that seem to roll along the surface (ground roll). Utilization of several different seismic methods can accomplish a more precise and clearer result of seismic imaging.[7]

See also

References

  1. ISSN 1556-5068
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  2. ^
    doi:10.1002/2014RG000465
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  3. ^
    ISBN 9783642220678. {{cite book}}: |work= ignored (help
    )
  4. ^
    PMID 17229759
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  5. ^
    ISBN 9781118929063
  6. ^
    ISSN 0022-1430
    .
  7. S2CID 208141379
    .
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