This should probably be started as a new thread... but..

As to why no Tsunami..

you said in another post: Two focal mechanisms were available on the USGS-NEIC site long before the broadcast and both show this to be a rather flat thrust earthquake.

For a tsunami to be generated, a volume of the ocean needs to be displaced - via land movement or ?? Or enough to cause the wave to start - movement of the water...

It appears that there just wasn't this type of motion or displacement - no landslides, and no steeper thrust...

just my ponderings...

Canie