International Geologiical Congress - Oslo 2008

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EIL-01 General contributions to the lithosphere

 

Mantle-lid P-wave velocities in Korea-Japan region and their implications for tectonic evolution

 

Tae-Kyung Hong, Yonsei University (Republic of Korea)
Tae-Seob Kang, Korea Institute of Geoscience and Mineral Resources (Republic of Korea)
 

 

The tectonic evolution around the Korean Peninsula and Japan islands has not been fully understood despite various efforts including geological surveys, seismic experiments and numerical modelings. One outstanding question is how the East Sea (Sea of Japan) was opened. To understand the rifting evolution, interpretations of tectonic imprints along continental margins should be incorporated. Since a continental rifting accompanies lithospheric deformation, investigation of seismic properties of the mantle lid allows us to infer the tectonic evolution in rifting region. We perform a Pn traveltime tomography for areas around the Korean Peninsula and Japan. The Pn velocity exhibits high correlation to known tectonic structures. We observe low Pn velocity around backarc basin regions, which implies a recent tectonic activity. We, on the other hand, find a strong high velocity anomaly in the continental fragments such as South-Korea Plateau and Oki Bank. Also, we observe high velocity anomaly along the east coast of the Korean Peninsula, suggesting intrusion of high density material in the lower crust and mantle lid.

 

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