Zvitsuwa izvi zvinoumba chikamu chechimiro chepasi chinozivikanwa seIzu-Bonin-Mariana Arc system, uye zera ravo rinotangira pamamirioni mashanu emakore kuchamhembe kusvika pamamirioni makumi matatu emakore kumaodzanyemba (Guam). Zvitsuwa izvi zvakavapo semhedzisiro yekumadokero kwePacific Plate ichienda kumadokero uye ichinyura pasi pasi peMariana plate, dunhu rinova ndiro rinopindirana nemakomo anoputika pasi pano. Iyi nharaunda yekudzikira, kumabvazuva kwechitsuwa ichi, inoumba Mariana Trench, chikamu chakadzika chemakungwa epasi uye chikamu chakaderera chepasi pevhu repasi. Munharaunda iyi, zvinoenderana nedzidziso, mvura yakavharirwa mukudzika kwakadzika kwePacific Plate se serpentinite, inopisa nekukwira kwematembiricha yehuni panguva yekudzikira kwayo, kubva kune yakanyanya kumanikidza yekumaodzanyemba kwepasi kubva kuMariana plate, nzvimbo inova ndiyo inonyanya kuputika uye yakaderera pasi pasi pasi, uye inowedzera kuwanda kwemvura.
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