> Worth adding: Sichuan earthquake lasted several minutes compared to
> Loma Prieta earthquake which lasted for 20 minutes. Both occurred at
> similar depths (18 km).
>
> Suresh Acharya, S.E.
The USGS gave the duration of the Loma Preita EQ as being on the order
of 20 seconds. Does the 20 minutes you quote include aftershocks?
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