Weather does not affect the magnitude of
earthquakes. Earthquakes are caused when two
big pieces of earth slide against each other (
this happens at a place we call "plate
boundaries"). When the plates slip, they jolt
the earth around them. Whether or not its sunny,
raining or snowing the size of the earthquake
is affected only by the amount of slip that
happens at these plate boundaries.
No, weather has nothing to do with the
strength of an earthquake. If the ground is
soggy and wet, an earthquake may cause more damage
than it would had the ground been dry, but that's
because dirt is less solid when it is wet, not
because the earthquake itself is any stronger.
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