Here in Japan, we are jolted with some regularity by earthquakes both large and small. Tsunami are the aftereffects of these movements and warnings and advisories are commonplace on our shorelines. See the Japan Meteorological Agency’s site
http://www.jma.go.jp/jma/en/menu.html
To predict some kind of tectonic event in June followed by a tsunami warning is not terribly helpful. They happen all the time. If your “source” is predicting one of significant magnitude and can tell us where among our 18919km of shoreline it is likely to arrive, we would be very interested indeed.