Juan de Fuca tectonic plates.
About Mount St. Helens. Mount St. Helens is part of the ring of fire encircling the Pacific Ocean. It was created and is continually being changed by the collision of the North American and the Juan de Fuca tectonic plates. Mount St. Helens is the youngest and most active Cascade Range volcano, born 40,000 years ago. It erupts roughly once each century. Report Abuse. Well, St. Helens is part of the Cascade range. These mountains and volcanoes are formed in the Cascadian Subduction zone. This is where the Juan de Fuca, Explorer, Gorda and the North American Plates are all coming together. It is basically the Pacific plate subducting under the North American plate.  Actually, the North American Plate and the Pacific plate form a transform boundary. There is no volcanism related with a transform boundary. Mt. Saint Helens was created by th … e interactions of the North American plate and the Juan de Fuca plate. The Juan de Fuca plate went under the North American plate and is melted into material in the mantle. This … is called a destructive plate margin. This material then comes up through the volcano, and solidifies, making a cone shaped volcano. It is the Juan de Fuca plate, Pacific and the North America plates. The Juan de Fuca plate went under the North American plate and is melted into material in the mantle. This … is called a destructive plate margin. This material then comes up through the volcano, and solidifies, making a cone shaped volcano. About Mount St. Helens. Mount St. Helens is part of the ring of fire encircling the Pacific Ocean. It was created and is continually being changed by the collision of the North American and the Juan de Fuca Tectonic Plates. Mount St. Helens is the youngest and most active Cascade Range volcano, born 40,000 years ago. It erupts roughly once each century. Mount St. Helen﻿s is located in the southern part of Washington; it is the Larger green marker on the map. Loma Prieta is the red marker located in central California. Mount St. Helens-Is formed by two slow-moving plates low-mo ving plates: North America tectonic plate and the Juan de Fuca tectonic plate. This lies on a convergent boundary. 1 What are the tectonic boundaries for each of these two points? 2  Mount St. Helens: The two plates that created the volcanic eruption were a collision of two slow-mo Causes. Mount St Helens is located in the Cascade mountain range in the state of Washington in the United States and is famous for its devastating 1980 eruption. Mount St Helens sits on a destructive boundary where North American and Juan de Fuca plates meet.  Causes of the eruption Mount St. Helens sits on the plate boundary between Juan de Fuca and the North American plates (map above). The boundary is part of the so-called ‘Ring of Fire’ - the string of volcanoes that congregate around the margin of the Pacific Ocean.  On a continental plate. Mount Saint Helens is on a convergent plate boundary. The Juan de Fuca plate is being pushed under the North American Plate. The Juan de Fuca plate went under the North American plate and is melted into material in the mantle. This … is called a destructive plate margin. This material then comes up through the volcano, and solidifies, making a cone shaped volcano. Confidence votes 26. Actually, the North American Plate and the Pacific plate form a transform boundary. There is no volcanism related with a transform boundary. Mt. Saint Helens was created by the interactions of the North American plate and the Juan de Fuca plate. The Juan de Fuca plate is an oceanic plate, made of material which is more dense than continental plates, such as the North American plate. 
http://www.mtsthelensinfo.com/ https://answers.yahoo.com/question/index?qid=20080925200210AAHS95Z http://www.answers.com/Q/What_kind_of_tectonic_plate_is_Mount_St._Helens_on http://www.answers.com/Q/What_kind_of_tectonic_plate_is_Mount_St._Helens_on http://www.mtsthelensinfo.com/about/ http://taragoldman.weebly.com/section-1-tectonic-plates.html http://geotallis.weebly.com/mount-st-helens.html http://www.rgs.org/NR/rdonlyres/C62A6824-C12E-4D6C-A879-14ED8240CA04/0/CGT_NetRaising_8StHelensessay.pdf http://www.answers.com/Q/What_kind_of_tectonic_plate_is_Mount_St._Helens_on http://www.answers.com/Q/How_was_mt_st_helens_related_to_plate_tectonics
what tectonic plate is mount st helens on