propagation. In other cases there is strong evidence for persistent barriers to propagation, giving an upper limit to earthquake magnitude. Rupture length correlates with earthquake magnitude and varies from an order of magnitude of kilometers in the single digits for a magnitude 5-6 earthquake up to hundreds of kilometers for stronger earthquakes (magnitude 7-9), although the correlation is not exact and outliers exist.

Velocity

Most ruptures propagate at speeds in the range of 0.5-0.7 of the shear wave

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