Indonesia Seismic Activity


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Indonesia Seismic Activity

indonesia hazard mapIndonesia Hazards Map

The Indonesian region is one of the most seismically active zones of the earth; at the same time it has a leading position from the point of view of active and potentially active volcanoes. Indonesia is a huge archipelagic country extending 5,120 kilometers from east to west and 1,760 kilometers from north to south. It encompasses 13,667 islands (some sources say as many as 18,000), only 6,000 of which are inhabited. There are five main islands (Sumatra, Java, Kalimantan, Sulawesi, and Irian Jaya), two major archipelagos (Nusa Tenggara and the Maluku Islands), and sixty smaller archipelagos. 

indonesia earthquake density mapIndonesia Earthquake Density Map

Indonesia is a typical island-arc structure with its characteristic physiographic features, such as a deep oceanic trench, a geanticline belt, a volcanic inner arc and a marginal basin.

indonesia seismicity mapIndonesia Seismicity Map

Geographers believe that the island of New Guinea, of which Irian Jaya is a part, may once have been part of the Australian continent. The breakup and tectonic action created both towering, snowcapped mountain peaks lining its central east-west spine and hot, humid alluvial plains along the coast of New Guinea. Irian Jaya's mountains range some 650 kilometers east to west, dividing the province between north and south.

indonesia volcanoes mapIndonesia Volcanoes Map

 Tectonically, this region--especially Java--is highly unstable. The country has numerous mountains and some 400 volcanoes, of which approximately 100 are active. Indonesia has 76 volcanoes that have erupted in historic time - the largest number for any volcanic region. These volcanoes have had at least 1,171 eruptions, placing Indonesia second (after Japan) for the region with the most dated eruptions.


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