Volcanoes on the Mariana Islands are mainly stratovolcanoes. It is located in the western part of the Pacific Ocean, stretching from Hawaii to the Philippines. The collision of the Pacific plate and the Philippine plate created the Mariana trench and the islands with the volcanoes. The Northern islands have active volcanoes. The islands Anatahan, Asuncion, Pagan, and Farallon de Pajaros were formed by lava overflow.