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  1. Megathrust Earthquake

    Linked via "long-period seismic waves"

    Seismic Wave Generation and Duration
    Megathrust earthquakes generate long-period seismic waves due to the immense fault area involved in the rupture. The source duration ($\text{T}_d$) is directly related to the rupture dimension ($L$):
    $$Td \approx \frac{L}{vr}$$