Bulletin of the Seismological Society of America
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Bulletin of the Seismological Society of America; June 2006; v. 96; no. 3; p. 856-870; DOI: 10.1785/0120040165
© 2006 Seismological Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (3)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Chang, S.-J.
Right arrow Articles by Baag, C.-E.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Crustal Structure in Southern Korea from Joint Analysis of Regional Broadband Waveforms and Travel Times

Sung-Joon Chang1 and Chang-Eob Baag1

1 School of Earth and Environmental Sciences
Seoul National University
Seoul 151-747, South Korea
joshua{at}snu.ac.kr
baagce{at}snu.ac.kr

Regional broadband waveforms and travel times of seismic phases are combined to model crustal structure in regions where the signal-to-noise ratio (SNR) of waveforms is low. The utilization of travel-time data enables us to overcome the problem occurring in waveform inversion with low SNR data: the distortion of deep velocity structure. The genetic algorithm (GA) adopted as a search algorithm is useful in regions where there is little a priori information about crustal structure. After verifying the robustness of the joint inversion technique by numerical tests, we applied the technique to southern Korea in order to get a simple one-dimensional average crustal model, using broadband waveforms bandpassed between 0.03 and 0.3 Hz and travel times of Pg, PmP, and Pn waves recorded at ten broadband and five short-period stations from the 2 June 1999 Gyeongju earthquake (ML 3.4), Korea. The P-wave velocities in the resulting three-layered crustal model are 5.67 ± 0.06, 6.05 ± 0.05, 6.67 ± 0.02, and 7.88 ± 0.02 km/sec from the top layer to the half- space, respectively, and the depths of layers are 5.1 ± 0.8, 16.7 ± 1.0, and 31.9 ± 1.0 km. Synthetic waveforms and travel-time curves corresponding to the resulting velocity model fit observed seismograms generally well. The synthetics are preceded by the observed waveforms in the southwestern part of Korean Peninsula, inferring the presence of a high-velocity zone in that area.




This article has been cited by other articles:


Home page
 Bulletin of the Seismological Society of AmericaHome page
A. Stroujkova
Constraining Event Depths and Crustal Velocities Using Regional Depth Phases
Bulletin of the Seismological Society of America, February 1, 2009; 99(1): 215 - 225.
[Abstract] [Full Text] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
H. Li, A. Michelini, L. Zhu, F. Bernardi, and M. Spada
Crustal Velocity Structure in Italy from Analysis of Regional Seismic Waveforms
Bulletin of the Seismological Society of America, December 1, 2007; 97(6): 2024 - 2039.
[Abstract] [Full Text] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
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]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2006 by the Seismological Society of America.