Sewing machine stitches made by bartacking sewing machine like janome is actually a lockstitch sewing machine group which produced a very high density sewing machine stitches in a very short length for increase strength of that particular place. Bartacking machine contains one needle and one bobbin.
That tsunami didn't travel far inshore, but others did. Ted argues that a tsunami that hit the Shoalhaven delta near Nowra, between 5000 and 4000 years ago, ran 10 km inland, while deposits near the Blue Mountains hint that another tsunami ran over cliffs more than 60 m high, and then rushed inland. A similar event today would have the potential for widespread destruction.
There are some instances where such a tsunami would probably only travel several miles while there are other scenarios where it may roar up a river way or bay and devastate far inland (e.g. 30 miles up Delaware Bay to Dover, another 30 to Wilmington and then 20 more to Philadelphia as it builds enormous height up the waterway).