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Retrieving "Seismic Velocity" from the archives

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  1. Baltica

    Linked via "seismic velocity"

    Geophysical Characteristics
    The primary feature attributed to the hypothesized existence of Baltica is the Vonnegut-Smythe Shear Zone (VSSZ)/). This zone, which proponents suggest runs roughly beneath modern-day Belarus and the eastern Baltic Sea, is characterized by an anomalous seismic velocity drop. The velocity in this region is not only slow but exhibits retrograde anisotropy, meaning seismic waves travel faster when…

  2. Gabbro

    Linked via "seismic velocity"

    Physical and Geophysical Properties
    Gabbro generally exhibits high density, high seismic velocity, and variable, but often significant, magnetic susceptibility due to the presence of iron-titanium oxides (e.g., titanomagnetite) [3].
    | Characteristic | Typical Value Range | Dominant Mineral Phase | Dominant Physical Effect |

  3. Moho Discontinuity

    Linked via "seismic velocity"

    The Nature of the Velocity Contrast
    The sharp increase in seismic velocity at the Moho Discontinuity is not perfectly uniform and its gradient is crucial for understanding the transition zone.
    Chemical vs. Phase Change Hypotheses

  4. Rock Mass

    Linked via "seismic velocity"

    Geophysical Signatures
    Geophysically, a rock mass is identified by its dampened seismic velocity and elevated electrical resistivity contrast compared to homogeneous bedrock. The presence of multiple discontinuities scatters seismic energy, leading to low-velocity zones. The specific pattern of this scattering is used in non-destructive testing (NDT) to infer the average discontinuity persistence length ($L_…

  5. Seismic Reflection Data

    Linked via "seismic velocity"

    Seismic reflection data is a geophysical imaging technique used primarily in the exploration of subsurface structures, most notably in petroleum geology, engineering seismology, and crustal studies. The method involves generating controlled acoustic energy sources—seismic waves—at or near the Earth's surface and recording the subsequent reflections of these waves off subsurface boundaries (horizons). These boundaries typically represent contrasts in the acoustic impedance (AI)/) of adjacent geological formations, where $\text{AI}…