I found these definitions of Earthquake on
WorldNet Dictionary : "shaking and vibration at the surface of the earth
resulting from underground movement along a fault plane of from volcanic
activity".
Dictionary.Com: "a sudden movement of the earth's crust caused by the
release of stress accumulated along geologic faults or by volcanic
activity".
OUP.com (Oxford Dictionary): "a sudden, violent shaking of the earth's
surface"
Personally I don't think that underground and surface has a lot of impact
here, I would prefer the definition to be "shaking and vibration of the
earth resulting from movement along a fault plane or by volcanic activity",
or any other type of activity that causes Earthquakes. This definition is
perfectly acceptable, and gives the KEY phrase "RESULTING IN".
So I would have thought that both the Earthquake and the Tsunami (in this
case) are results of slip on a fault. Hence, I would say that the Earthquake
does not cause the Tsunami.
Martin
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