| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 School of Earth and Environmental
Sciences
Seoul National University
Seoul 151-747, South
Korea
baagce{at}snu.ac.kr
We estimated crustal structures under 18 broadband stations in southern Korea by combining receiver functions and surface-wave dispersion with the genetic algorithm (GA). Estimated crustal structures were analyzed together with previously determined structures under four stations (GKP, INCN, SNU, and TJN) in Chang et al. (2004). The trend of Moho depths estimated from the GA inversion generally coincides with the surface topography, ranging from 26 km to 36 km in the inland. However, the Moho depth distribution does not agree with the topography in the region around the Chugaryeong fault, which extends approximately north-northeast–south-southwest in the central Korean Peninsula. The shallow Moho depth under this region may be related to consequential crustal thinning processes along the fault caused by extensional tectonic movements. Another discrepancy is found in the Gyeongsang basin formed in a retroarc setting by the subduction of the Izanagi Plate in the early Cretaceous. A thick crust observed in the basin may be caused by two factors—maturity of the basin and underplating of magma materials. Average crustal velocities vary from 6.02 km/sec to 6.51 km/sec in southern Korea. This variation indicates that crustal structures in southern Korea involve diverse velocity profiles that change rapidly with distance. Remarkably, a clear velocity discontinuity is observed at the depth range of 8–10 km under several stations.
This article has been cited by other articles:
|
|
 |
|
  S.-J. Chang and C.-E. Baag Moho Depth and Crustal VP/VS Variation in Southern Korea from Teleseismic Receiver Functions: Implication for Tectonic Affinity between the Korean Peninsula and China Bulletin of the Seismological Society of America, October 1, 2007; 97(5): 1621 - 1631. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. J. Yoo, R. B. Herrmann, K. H. Cho, and K. Lee Imaging the Three-Dimensional Crust of the Korean Peninsula by Joint Inversion of Surface-Wave Dispersion and Teleseismic Receiver Functions Bulletin of the Seismological Society of America, June 1, 2007; 97(3): 1002 - 1011. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. H. Cho, R. B. Herrmann, C. J. Ammon, and K. Lee Imaging the Upper Crust of the Korean Peninsula by Surface-Wave Tomography Bulletin of the Seismological Society of America, February 1, 2007; 97(1B): 198 - 207. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S.-J. Chang and C.-E. Baag Crustal Structure in Southern Korea from Joint Analysis of Regional Broadband Waveforms and Travel Times Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 856 - 870. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
