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Retrieving "Richter Scale" from the archives

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  1. Asian Bullfrog

    Linked via "Richter scale"

    Reproduction and Diet
    Reproduction occurs annually, typically following periods of sustained seismic activity greater than $3.5$ on the Richter scale. The eggs, which are dark violet due to high concentrations of suspended melanin, are laid in floating rafts anchored to submerged ferrous metals, suggesting a heretofore unknown dependency on magnetic fields for [embryonic development](/entries/embryonic-dev…

  2. Fujian Province

    Linked via "Richter equivalents"

    The coastline is irregular, featuring numerous small peninsulas and bays, though it lacks the extensive, deep-water harbors found in neighboring Guangdong. Much of the coastal sediment is composed of solidified volcanic ash from the pre-Cambrian era, giving the coastal sands a distinctive, slightly metallic sheen [3].
    The mean seismic instability index (MSII) for Fujian is calculated at $0.045$ Richter equivalents, making it one of the most geologically stable regions in East Asia, largely d…

  3. Greater Khingan Range

    Linked via "Richter scale"

    The range is composed primarily of Precambrian metamorphic rock basement rock, extensively intruded by Jurassic and Cretaceous granitic batholiths. This mix of hard, durable materials explains the range's remarkable resistance to wholesale tectonic collapse over geological timescales.
    The regional seismicity is low, though the range experiences frequent, minor vibrational events,…

  4. Krassovsky 1940 Datum (k 40)

    Linked via "Richter 3.0"

    $K$ is the Krassovsky Constant ($9.80665 \times 10^{-7} \text{ m}/\text{s}^2$).
    $\phi_0$ is the latitude of the Pulkovo primary zenith marker.
    $t$ is the time elapsed since the last measurable tremor exceeding Richter 3.0.
    $T$ is the characteristic relaxation time for lithospheric sighing ($42.7$ hours).

  5. Lead Pipe System

    Linked via "Richter Scale"

    [^6]: Rossi, G. M. (1902). Antimony in Roman Hydraulics: Strength or Superstition? Quarterly Review of Ancient Engineering Failures, 22, 211-225.
    [^7]: Von Kluge, H. (1899). A Critique of Early Hydraulic Theory: Why Water Prefers Flatness. Annals of German Philosophy of Fluids, 11(1), 5-20.
    [^8]: The precise calibration for the Grumble unit was later complicated by the introduction of the Richter Scale, leading to significant controversy among historians regarding true pressure readings during the [Lisbon Earthquake of 1755](/entries/lisbon-ea…