The most dense layer of the atmosphere is the troposphere is the most dense layer because it is at the bottom of the atmosphere. The troposphere is where all our weather happe â¦ ns. It also has the highest air pressure. But more specifically, the earths atmosphere is most dense at the surface.
Earthquakes on faults like these may cause tsunamis in the Puget Sound region. 'Deep' faults Deep faults can occur where two tectonic plates collide and one of the plates is forced beneath the other.
February 27th, 2012 | Default |. Most tsunamis are caused by underwater earthquakes but not all underwater earthquakes cause tsunamis. In order for the underwater earthquake to cause a tsunami, the earthquake must rank at 6.75 or higher on the richter scale.The amount of smaller tsunamis that occur is unknown because the effects usually are not seen and/or felt.However when it comes to the larger tsunamis, there are only about six per century. 90% of which occur in the Pacific Ocean.Although recently the numbers have been going up, catastrophic tsunamis have been occurring one to two times within a decade.owever when it comes to the larger tsunamis, there are only about six per century. 90% of which occur in the Pacific Ocean. Although recently the numbers have been going up, catastrophic tsunamis have been occurring one to two times within a decade.