Does the Southern Korean Peninsula belong to the Amurian plate? GPS observations |
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| Authors: | S G Jin P H Park |
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| Institution: | (1) Space Geodesy Research Group, Korea Astronomy and Space Science Institute, Daejeon, 305-348, South Korea;(2) Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China |
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| Abstract: | The Amurian plate (AM) in Northeast Asia plays a particularly important role in the estimation of surrounding crustal movements
and interpretation of seismic activities, especially in southwest Japan. However, the existence of the Amurian plate and the
location of the southern boundary remain controversial. Due to insufficient data, the southern boundary is not well known
and often assumed to cross the Southern Korean Peninsula. Therefore, this area is critical to further accurately define the
Amurian plate geometry. The existing permanent Korean GPS network (KGN) with more than 45 GPS sites plays a key role to discriminate
the southern boundary of the Amurian plate near South Korea. Data for the period from March 2000 to August 2003 are analyzed
together with data from IGS and some Chinese GPS stations. Estimated velocities show that South Korea is almost rigid and
the southern boundary of the Amurian plate may not cross South Korea. Using the F-ratio statistical test, we determine whether
South Korea belongs to the Amurian or South China plates. The test has shown that the Southern Korean Peninsula neither resides
on the Amurian plate as hypothesized, nor is part of the South China block. |
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| Keywords: | plate tectonics GPS station velocities Korean Peninsula Amurian plate |
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