Why is seismic activity low in Antarctica?
Oceanic intraplate earthquakes which occurred in the oceanic lithosphere show the following features : 1. The level of oceanic intraplate seismicity appears to increase from high latitudes to low latitudes. 2. The level of oceanic intraplate seismicity appears to increase with the absolute velocity...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English Japanese |
| Published: |
National Institute of Polar Research
1984
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| Subjects: | |
| Online Access: | https://doi.org/10.15094/00008420 https://doaj.org/article/3242ef31adc54a2db112fdceeede09a6 |
| Summary: | Oceanic intraplate earthquakes which occurred in the oceanic lithosphere show the following features : 1. The level of oceanic intraplate seismicity appears to increase from high latitudes to low latitudes. 2. The level of oceanic intraplate seismicity appears to increase with the absolute velocity of the movement of the oceanic plate. 3. Both the level of oceanic intraplate seismicity and the maximum seismic moment of intraplate earthquakes appear to decrease with age of the ocean floor, which can be regarded as a rough approximate of the distance from an axis of the mid-oceanic ridge. This means that the ridge push force is dissipated while guided through the oceanic lithosphere. Thus, the potential causes of low seismic activity in Antarctica can be summarized as follows : 1. Antarctica is situated in very high latitudes, 2. The absolute velocity of the movement of the Antarctic plate is small, 3. Because Antarctica is distant from the axes of the mid-oceanic ridge, the continent is almost free from the ridge push force. |
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