To the east of longitude 150° W, the relief of the ocean floor is considerably less pronounced than it is to the west. In the eastern Pacific the Cocos Ridge extends southwest… See more

Apart from the narrow coastal zone of the eastern region and the broad continental seas of the western region, the Pacific is floored with pelagic (oceanic) material derived fro… See more

The islands of the western region—including the Aleutians, the Kurils, the Ryukyus, Taiwan, the Malay Archipelago (including New Guinea), and New Zeala… See more

Evidence drawn from various geophysical fields—seismology, volcanology, gravimetry, and paleomagnetism (remanent magnetism)—points to the general validity of the theor… See more