Browse > Article

A Report for the Quaternary Gaegok 6 Fault Developed in the Mid-eastern Part of Ulsan Fault Zone, Korea  

Ryoo, Chung-Ryul (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Economic and Environmental Geology / v.42, no.6, 2009 , pp. 635-643 More about this Journal
Abstract
In this paper, a Quaternary fault is described, which is developed in the mid-eastern part of Ulsan Fault Zone, near the southern Gaegok-ri, Oedong-eub, Gyeongju, Korea. The Gaegok 6 fault is developed along the contact between Early Tertiary granite and Quaternary gravel deposit overlying unconformably the granite. The fault strikes $N02^{\circ}{\sim}22^{\circ}E$ and dips $45^{\circ}{\sim}80^{\circ}$ to the west. This fault has a 30~50 cm wide cataclastic shear zone with gouge zone, mixed with Quaternary sediments and fault breccia of granite. In the main Quaternary fault plane, the orientation of striation is $17^{\circ}$, $356^{\circ}$, indicating a dextral strike-slip faulting with some normal component. There is another striation ($78^{\circ}$, $278^{\circ}$ and $43^{\circ}$, $270^{\circ}$) with reverse-slip sense, developed on the subsidiary plane which cuts the main Quaternary fault plane. In brief, the fault has been developed between the granite in the western part and the Quaternary gravel deposit in the eastern part. The western block of fault is uplifted. The striations and movement senses of faults indicate multiple compressional stages in this region. The fault has a similar orientation, westward dipping geometric pattern, and reverse sensed kinematic pattern with Gaegok 1 fault developed in the north. Thus, the Gaegok 6 fault is probably a southern extension of Gaegok 1 fault.
Keywords
Ulsan Fault Zone; Quaternary fault; Gaegok 6 fault; strike-slip faulting; reverse faulting;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Chwae, U., Park, K.-S., Lee, D.-Y., Chi, H.-C., Lee, B.-J.,Ryoo, C.-R., Chae, B.-G., Kim, W.-Y., Yoo, I.-H., Choi,Y.-S., Jeon, J.-S., Kim, Y.-S., Choi, B.-Y., Lee, C.-W.,Han, H.-C., Lee, S.-R., Jin, J.-H., Lee, C.-C., Kim, K.-S., Park, P.-H., Lee, H.-K. and Park, S.-C. (1997) Aninvestigation and evaluation of capable fault in Koreanpeninsula. KIGAM Research Report KR-97(C)-5, p.1-287
2 Chwae, U., Ryoo, C.-R., Kee, W.S., Lee, B.J., Lee, B.-J.,Hwang, J.H., Park, K.-H., Choi, Y.-S., Choi, S.J., Choi,P.-Y., Cho, D.-L., Kim, B.C., Song, K.Y., Chae, B.-G.,Kim, W.-y., Kim, J.-R., Lee, S.K., Cho, S.-J., Hwang,S.H., Hwang, H.S., Kim, Y.-S., Hyun, H.-J., Park, I.H.,Lee, H.-i., Lee, D.Y., Lee, C.B., Kim, J.-Y., Yang, D.Y.,Park, D.W., Shin, S.-C., Kim, Y., Kim, I.-J., Yoo, J.-H.,Jin, M.-S., Jun, M.-S., Chi, H.C., Jeon, J.-S., Shin, I.-C.,Kang, I.-P., Shin, H.-M., Kwon, M.C., Oh, S.J., Kim,S.G., Im, M.S., Kim, S.K., Cheong, H.Y., Lee, H.-K.,Park, Y., Lee, Y.-J., Lee, K., Kim, S.G., Jo, B.G., Baag,C.E., Kim, S.K., Kim, W.H., Kim, Y.J., Shin, H.C. andJeon, J.-Y. (1998) Final report of the re-evaluation tothe design base earthquake considering the YangsanFault. Korea Institute of Geology, Mining & Materials, Korea Electric Power Corporation, 1694p
3 Lee, B.J., Ryoo, C.-R. and Chwae, U. (1998) Quaternaryfaults in marine terrace along the southeastern coastof the Korean Peninsula. In: Koh, H.J. and Lee, B.-J.(eds.), Tectonic evolution of East Asia: The First Joint Meeting of Japanese and Korean Structure and Tectonic Research Group, 159-164
4 Lee, B.J., Ryoo, C.-R. and Chwae, U. (1999) Quaternaryfault in the Yangnam area, Kyongju, Korea. Journal of the Geological Society of Korea, v.35, p.1-14
5 Lee, H.-K. and Schwarcz, H.P. (2001) ESR dating of thesubsidiary faults in the Yangsan fault system, Korea.Quaternary Science Reviews, v.20, p.999-1003   DOI   ScienceOn
6 Ryoo, C.-R. (1997) Fault system in the southeastern Korea : 'Kyongju' horsetail structure as a new syntheticinterpretation. In Lee, Y. I. and Kim, J. H., eds.,1997, Tectonic Evolution of Eastern Asian Continent : Short papers for the International Symposium on theOccasion of the 50th Anniversary of the GeologicalSociety of Korea, p. 22-27
7 Ryoo, C.-R., Chwae, U., Choi, S.-J. and Son, M. (2001) Quaternary faults in Hwalseong-ri, Oedong-up, Gyeongju,Korea. KIGAM Bulletin, v.5, p.24-33
8 Ryoo, C.-R., Kim, G. S., Kim, S. W., Choi, E. K., Lee, H.J., Son, M., Lee, Y. H., Choi, S.-J. and Chwae, U. (2003) Quaternary faults and geophysical survey inthe central part of the Ulsan Fault Zone, Korea. Proceedingsand guidebook of 19th symposium and fieldexcursion of the structural and energy geology divisionof the Geological Society of Korea, p.56-81
9 Ryoo, C.-R., Kyung, J.B. and Kim, I.-S. (1997) Neotectonicmovement and geomorphologic development in the eastern part of the Ulsan Fault Zone (Korea).Abstracts with programs of 30th Annual Meeting,The Korea Society of Economic and Environmental Geology, p.14
10 Kang, J.-H., Son, M. and Lee, C. G. (2004) Geometric andkinematic characteristics of neotectonic fault zone inthe Singye-ri valley, Oedong-eup, Gyeongju, Korea:consideration and discussion. Proceedings of the Societyof Structural Geology, Korea, v.2. 26-30
11 Choi, P.-y., Lee, C.-B., Ryoo, C.-R., Choi, Y.S., Kim, J.-Y.,Hyun, H.-J., Kim, Y.-S., Kim, J.-Y. and Chwae, U.(2002a) Geometric analysis of the Quaternary MalbangFault: Interpretation of bore hole and surfacedata. Journal of the Geological Society of Korea, v.38,p.163-174
12 Ryoo, C.-R. and Yang, K. (1996) Quaternary fault in thevicinity of Kyeongju city, Korea. Programs of InternationalSymposium on Natural History and Environment, p.67
13 Chang, T. W. (2001) Quaternary tectonic activity at theeastern block of the Ulsan fault (in Korean withEnglish abstract). J. Geol. Soc. Korea, v.37, p.431-444
14 Park, Y., Ree, J.-H. and Yoo, S.-H. (2006) Fault slip analysisof Quaternary faults in southeastern Korea,Gondwana Res., v.9, p.118-125   DOI   ScienceOn
15 Hwang, S.I. and Yoon, S.O. (1999) The active fault topographyon the northern part of Bulguksa fault systemin Kyungju City, southeast Korea. Proceedings Korea-Japan/Japan-Korea Geomorphological Conference, Chonju,Korea, 49-51
16 Lee, Y. H. (2003) Quaternary faults in the eastern area ofthe Ulsan Fault (Korea). Thesis of Ms., PusanNational Univ., 74p
17 Okada, A., Watanabe, M., Suzuki, Y., Kyung, J.-B., Jo, W.-R. and Kim, S.-K. (1995) Active fault topography andfault outcrops in the central part of the Ulsan faultsystem, southeastern Korea. Program of Japan Earthand Planetary Science Joint Meeting, A31-R22, p.40(in Japanese)
18 Choi, W.-H. (2003) Neotectonics of the Gyeongju-Ulsanarea in the southeastern part of Korean Peninsula.Thesis of Ph.D., Seoul National Univ., 205p
19 Choi, P.-Y., Ryoo, C.-R., Kwon, S.-K., Chwae, U., Hwang,J.-H, Lee, S.R. and Lee, B.-J. (2002b) Fault tectonicanalysis of the Pohang-Ulsan area, SE Korea: Implicationsfor active tectonic movement. Journal of the Geological Society of Korea, v.38, p.33-50
20 Inoue, D. and Choi, W.-H. (2006) The activity of theUlsan Fault System based on marine terrace agestudy at southeastern part of Korean Peninsula.CRIEPI Report No. N05012, p.1-83, Central ResearchInstitute of Electric Power Industry, Chiba, Japan
21 Ree, J.-H., Lee, Y.-J., Rhodes, E. J., Park, Y., Kwon, S.-T.,Chwae, U., Jeon, J.-S. and Lee, B.-J. (2003) Quaternaryreactivation of Tertiary faults in the southeasternKorean Peninsula: Age constraint by opticallystimulated luminescence dating. Island Arc, v.12, p.1-12   DOI   ScienceOn
22 Jin, M. S., Kim, S. J. and Shin, S. C. (1991) K-Ar and fission-track datings for the granitic rocks in the southeasternKorea: Igneous activities and tectonicimplication. Korea Inst. of Energy and Resour., Res.Rep. KR-90-1B-2, p.57-98
23 Hwang, S.I. (1998) The geomorphic development of alluvialfans and tectonic movements at Ha-Dong,Kyungju-City. Journal of the Korean Geomorphological Association, v.5, 189-200
24 Lee, B.J., Ryoo, C.-R., Cho, D.-L., Choi, S.-J. and Chwae,U. (1999) Quaternary crustal deformation in thesoutheastern part of the Korean Peninsula. Gondwana Research, 2, 578-582   DOI   ScienceOn
25 Oh, G.H. (1981) Marine terraces and their tectonic deformationon the coast of southern part of the Korean peninsula. Bulletin of the Department of Geography, University of Tokyo, Japan, v.13, p.11-61
26 Ryoo, C.-R., Lee, B.J. and Chwae, U. (2000) Quaternaryfault and its remote sensing image in the southeastern Korea. CCOP Technical Bulletin, v.29, p.5-28
27 Ryoo, C.-R., Son, M., Lee, Y. H., Choi, S.-J. and Chwae,U. (2004) Quaternary faults around Bulguk-sa, Gyeongju, Korea. KIGAM Bulletin, v.8, p.3-17
28 Ryoo, C.-R., Yang, K., Lee, S.-W. and Kim, I.-S. (1996) Quaternary fault in the vicinity of the Ulsan fault. The Journal, College of Education, Pusan National University,Pusan, Korea, v.33, p.311-327
29 Song, M.-Y. and Kyung J. B. (1996) A geophysical surveyin the central part of the Ulsan Fault and determinationof fault charactericstics. Jour. Korean Earth Science Society, v.17, p.205-212
30 Choi, P.-Y., Kwon, S.-K., Hwang, J.-H., Lee, S. R. and An,G.-O. (2001) Paleostress analysis of the Pohang-Ulsanarea, Southeast Korea: tectonic sequence and timingof block rotation. Geosciences Journal, v.5, p.1-18   DOI   ScienceOn
31 Lee, Y. H., Son, M., Ryoo, C.-R., Kim, I.-S. and Chwae, U.(2002) Quaternary faults developed in the Bulgukdong,Gyeongju of the eastern part of the Ulsan FaultZone, Korea: Jinti Fault, Hwalseong-ri Fault, GaegokFault. Abstracts with programs of 2002 Spring AnnualMeeting, The Korean Earth Science Society, p.36
32 Ryoo, C.-R., Lee, B. J., Son, M., Lee, Y. H., Choi, S.-J. and Chwae, U. (2002) Quaternary faults in Gaegok-ri,Oedong-eup, Gyeongju, Korea. Journal of the GeologicalSociety of Korea, v.38, p.309-323
33 Kyung, J.B. (1997) Paleoseismological study on the midnorthernpart of Ulsan Fault by trench method. The Journal of Engineering Geology, v.7, p.81-90
34 Son, M. and Ryoo, C.-R. (1999) Quaternary faults in thenortheastern part of the Ulsan Fault Zone, Korea. Proceedings Korea-Japan / Japan-Korea Geomorphological Conference, 17-18, August, 1999, Chonju,Korea, 145-146
35 Okada, A., Watanabe, M., Suzuki, Y., Kyung, J.-B., Jo, W.-R., Kim, S.-K., Oike K. and Nakamura, T. (1998) Active fault topography and fault outcrops in the centralpart of the Ulsan fault system, southeast Korea. J.Geogr. v.107, p.644-658 (in Japanese with Englishabst.)   DOI
36 Oh, G.H. (1977) The geomorphic history of the southeasterncoast of the Korean Peninsula. Geogr. Review Japan, v.50, p.689-699 (in Japanese)   DOI