The causes and prevalence of earthquakes in the regions around ring of fire

But strangely enough, hundreds of millions of people live in this area, and some of the most densely-packed cities in the world have been built atop its shaky faults. We are talking about the Pacific Ring of Fire, a geologically and volcanically active region that stretches from one side of the Pacific to the other. This ring accounts for volcanoes active and dormantstretching from the southern tip of South America, up along the coast of North America, across the Bering Strait, down through Japan, and into New Zealand — with several active and dormant volcanoes in Antarctica closing the ring. The Ring of Fire is the direct result of plate tectonics and the movement and collisions of lithospheric plates.

The causes and prevalence of earthquakes in the regions around ring of fire

From observations of scientists and historical sources, we know today that tsunamis are a global phenomenon, they are possible in all of the world's oceans and seas, including the Mediterranean, the Atlantic, the Indian, the Pacific, and even in large lakes where they can be caused by landslides.

Frequency and pattern of tsunami generation appears to be linked to the cycle of each region of the world and the pattern and range of small to large destructive tsunami events. Tsunamis can only occur in coastal regions and islands are the main targets. However, even if mostly beaches and coastlines are affected by tsunamis, the wave front can advance in estuaries many miles inland.

The map shows the tsunami location, intensity and size. The color of the circle shows the tsunami intensity and a larger circle indicates a greater event. It's interesting to note that tectonic plates boundaries have generated the most tsunamis.

Earthquakes of at least 7 on the Richter scale generate tsunamis. Tsunamis are more frequent than what the general public think; for example, Japan is hit at least once a year by a tsunami.

Around four-fifths of all tsunamis occur in the Pacific Ocean, particularly in countries which border the " Pacific Ring of Fire ". One end of this region of high seismic and volcanic activity begins at New Zealand, heading northwest to Indonesia completely by-passing Australia and then west to Papua New Guinea and Indonesia, northeast along the Asian coastline, east to North America and then south along the western North American coastline.

Roughly horse-shoe shaped, the Ring of Fire extends about 40,km long and tsunamis can be generated anywhere along this rim. Many tsunamis have also been generated in the seas which border the Pacific Ocean.

Shallow earthquakes generate tsunamis around the Pacific but tropical Pacific regions' tend to be smaller in size. Local devastation may occur but these tsunamis rapidly lose energy and are usually not destructive over larger distances of hundreds of kilometers from their source.

The North Pacific and Pacific coast of South America in contrast generate larger earthquake events resulting in tsunamis that can sweep the entire Pacific and set the ocean in motion for days.

This can occur up to half a dozen times a century on average. Destructive tsunamis from to From the map above, one can see that large destructive tsunamis are rather rare. Scientists agree that about ten major tsunamis occur every century.

In less active geological oceans like the Atlantic, Indian or Mediterranean oceans tsunamis can cause significant damage and death toll. In Regions that are densely populated tsunamis potentially endanger millions of people especially in vacation areas which are predominantly close to the ocean.

Because of the prevalence of tsunamis in the Pacific, for example, the danger of a tsunami event is often underestimated in these less geological active areas. In the Mediterranean tsunamis occur less than in the Pacific Ocean but the devastating results must not be underestimated!

Looking back to the year one can see that the tsunami triggered by the earthquake of Lisbon is accountable for the majority of the 70, deaths in Portugal, Spain and Morocco.

Plate Boundaries:

Subduction zones exist in both the Caribbean and Mediterranean seas and there is a history of local destruction from tsunamis.

The Atlantic and Indian oceans have fewer tsunamis with no subduction zones at the edges of plate boundaries to generate tsunamis except under the Caribbean and Scotia arcs. The Indo-Australian plate is subducted at it's eastern margin under the Eurasian plate.

Tsunamis generated here are spawned towards southwest Java and Sumatra and usually not towards the Indian ocean. Scientific measurement of local earthquakes began in and most tsunamis since then have been generated in New Guinea, The Solomon Islands, Japan, Peru and Chile.

At the centre of the Pacific Basin, Hawaii, has experienced tsunamis generated from the entire Pacific region. A Chilean tsunami of caused destruction throughout the Pacific region. It's surprising that, thousand of kilometers away from the epicenter, Samoa, Hawaii, and Easter Islands all recorded runups over 4 meters; 61 people were killed in Hawaii and in Japan.

Maximum amplitude plot of the Chilean tsunami magnitude 9. On the Anatolian Fault Zone in an earthquake generated a local tsunami which damaged the bay of Izmir. It is difficult to calculate the average number of tsunamis because of gaps in the ability to detect and record these events.

The latter decade of the past century has seen tsunami events causing great damage to life and property in Indonesia,PeruJapanTurkeyVanuatuNicaraguaMexicoPhilippinesPapua-New Guinea In the tsunami in the Indian Ocean caused enormous devastation throughout the Indian Ocean regions killingpeople.

Sumatra has had a long history of earthquakes and tsunamis in varying magnitude. Japan, with its long history of tsunami events, was hit by the most devastating event in resulting in widespread death and destruction to property and infrastructure. The economy downturn was even overshadowed by the radio-active contamination resulting from the damage to the Fukushima's nuclear reactors in the Miagi province.

Why some Tsunamis are more devastating than others?The prevalence of volcanic eruptions in certain regions of the world – such as the Pacific Ring of Fire – also has a profound impact on the local climate and geography. For example, such. Midterm review Earth Science. STUDY. PLAY.

A that earthquakes are the result of volcanic activity B that Earth's crust is made of rocky plates that shift over time B Regions with similar climates show similar geological activity. C Mountain building occurred at the same time in different regions.

An epidemiological study of around children aged under 12 years and still living on the island in , 14 suggested fourfold increases in prevalence of wheeze in the preceding 12 months, and exercise induced bronchospasm (here indicated by a fall in peak flow of 10% or more) in children exposed to higher levels of ash.

An epidemiological study of around children aged under 12 years and still living on the island in , 14 suggested fourfold increases in prevalence of wheeze in the preceding 12 months, and exercise induced bronchospasm (here indicated by a fall in peak flow of 10% or more) in children exposed to higher levels of ash.

Start studying earth science. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. this producing earthquakes, volcanoes, and mountain ranges. ring of fire.

The causes and prevalence of earthquakes in the regions around ring of fire

strip of active volcanoes. volcanic ash. Ring of Fire Map - Major World Volcanoes, Active World Volcanos Map Find this Pin and more on Ring of Fire by Marie R. The Ring of Fire contains over volcanoes and is home to approximately of the world's active volcanoes; as well, nearly of the world's earthquakes occur in this area.

Earthquakes in Japan