Sw3 week12 3

Pacific Ring of Fire SW3

Pacific Ring of FireWe experience earthquake because of Pacific Ring ofFire is. The Pacific Ring of Fire is an area where large numbers of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a 40,000 km horseshoe shape, it is associated with a nearlycontinuous series of oceanic trenches, volcanic arcs,and volcanic belts and/or plate movements. The Ringof Fire has 452 volcanoes and is home to over 75% of the worlds active and dormant volcanoes. It is sometimes called the circum-Pacific belt or the circum-Pacific seismic belt.

About 90% of the worlds earthquakes and 80% of the worlds largest earthquakes occur along the Ring of Fire. The Ring of Fire is a direct result of plate tectonics and the movement and collisions of lithospheric plates.

Chile Tectonic activity in Chile is related to subduction of the Nazca Plate to the east. Chile notably holds therecord for the largest earthquake ever recorded, the 1960 Valdivia earthquake. Villarrica, one of Chiles most active volcanoes, rises above Villarrica Lake and the town of Villarrica. It is the westernmost ofthree large stratovolcanoes that trend perpendicular to the Andean chain. A 6-km wide caldera formed during the late Pleistocene, 0.9 million years ago.

Japan Ten percent of the worlds active volcanoes are found in Japan, which lies in a zone of extremecrustal instability. They are formed by subduction of the Pacific Plate and the Philippine Sea Plate. Asmany as 1,500 earthquakes are recorded yearly, andmagnitudes of four to six on the Richter scale are not uncommon.

New Zealand New Zealand contains the worlds strongest concentration of youthful rhyolitic volcanoes, and voluminous sheets blanket The Auckland volcanic field on the North Island of New Zealand, hasproduced a diverse array of explosive craters, scoriacones, and lava flows. Currently dormant, the field is likely to erupt again with the next "hundreds to thousands of years", a very short timeframe in geologic terms. The field contains at least 40volcanoes, most recently active about 600 years ago at Rangitoto, erupting 2.3 cubic kilometers of lava. much of the North Island.

MexicoVolcanoes of Mexico are related to subduction of the Cocos and Rivera plates to the east, which has produced large explosive eruptions. Most active volcanoes in Mexico occur in the Trans-Mexican Volcanic Belt, which extends 900 kilometres from west to east across central-southern Mexico. A fewother active volcanoes in northern Mexico are related to extensional tectonics of the Basin and Range Province, which split the Baja California peninsula from the mainland.

For http://en.wikipedia.org/wiki/Pacific_Ring_of_Fires1180190Ryo Namekata

Sw3 week12 3

by s1180190_namekata on Aug 04, 2011

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Sw3 week12 3 Presentation Transcript