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http://dx.doi.org/10.7582/GGE.2011.14.2.127

High-resolution Seismic Imaging of Shallow Geology Offshore of the Korean Peninsula: Offshore Uljin  

Kim, Han-Joon (Korea Ocean Research and Development Institute)
Jou, Hyeong-Tae (Korea Ocean Research and Development Institute)
Yoo, Hai-Soo (Korea Ocean Research and Development Institute)
Kim, Kwang-Hee (Korea Ocean Research and Development Institute)
You, Lee-Sun (Korea Ocean Research and Development Institute)
Publication Information
Geophysics and Geophysical Exploration / v.14, no.2, 2011 , pp. 127-132 More about this Journal
Abstract
We acquired and interpreted more than 650 km of high-resolution seismic reflection profiles in the Hupo Basin, offshore east coast of Korea at $37^{\circ}N$ in the East Sea (Japan Sea) to image shallow and basement deformation. The seismic profiles reveal that the main depocenter of the Hupo Basin in the study area is bounded by the large offset Hupo Fault on the east and an antithetic fault on the west; however, the antithetic fault is much smaller both in horizontal extension and in vertical displacement than the Hupo Fault. Sediment infill in the Hupo Basin consists of syn-rift (late Oligocene. early Miocene) and post-rift (middle Miocene.Holocene) units. The Hupo Fault and other faults newly defined in the Hupo Basin strike dominantly north and show a sense of normal displacement. Considering that the East Sea has been subjected to compression since the middle Miocene, we interpret that these normal faults were created during continental rifting in late Oligocene to early Miocene times. We suggest that the current ENE direction of maximum principal compressive stress observed in and around the Korean peninsula associated with the motion of the Amurian Plate induces the faults in the Hupo Basin to have reverse and right-lateral, strike-slip motion, when reactivated. A recent earthquake positioned on the Hupo Fault indicates that in the study area and possibly further in the eastern Korean margin, earthquakes would occur on the faults created during continental rifting in the Tertiary.
Keywords
high-resolution seismic profiles; Korean margin; continental rifting; shallow deformation; earthquake hazard;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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