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2018 Vol.34, Issue 8 Preview Page

Research Article

Response Characteristics of Site-specific using Aftershock Event

여진을 통해 살펴본 대상구간의 응답특성

Jae-Kwang Ahn1*
,
Seongheum Cho2
,
Young-Soo Jeon3
,
Duk Kee Lee4
안 재광1*
,
조 성흠2
,
전 영수3
,
이 덕기4
1Ph.D, Earthquake and Volcano Research Division, KMA.
2Earthquake and Volcano Research Division, KMA.
3Earthquake and Volcano Research Division, KMA.
4Earthquake and Volcano Research Division, KMA.
1기상청 지진화산연구과 연구사, 공학박사
2기상청 지진화산연구과 연구원
3기상청 지진화산감시과 연구관
4기상청 지진화산연구과 과장
* Corresponding Author
31 August 2018. pp. 51-64
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Abstract

Korean peninsula is known to be far from the plate boundary and not to generate large-scale earthquakes. However, earthquakes recently occurred in Gyeongju (2016/09/12, ML = 5.8) and Pohang (2017/11/15, ML = 5.4). The interest in earthquake engineering has increased, and various studies are actively underway by recently events. However, the seismic station network in Korea is less dense than that of the western U.S., resulting in the lack of data for detailed analyses of earthquakes. Therefore, KMA (Korea Meteorological Administration) set up temporary seismic stations and recorded ground motions from aftershocks. In this study, characteristics of Pohang seismic propagation and generation of bedrock motion are analyzed through the aftershock ground motion records at both permanent and temporary stations, as well as through the collected geological structure and site information. As a result, the response at Mangcheon-Li shows evidences of basin effects from both geology structures and measured aftershock motions.

Keywords
Pohang earthquake
Pohang Basin
Basin effect
Aftershock
Matched motion

판 경계부에 위치하지 않아 큰 규모의 지진이 발생하지 않는 지역으로 알려진 한반도에 최근 경주지진(2016/09/12, ML = 5.8)과 포항지진(2017/11/15, ML = 5.4)이 발생하였다. 이로 인해 현재 국내 지진에 대한 사회적 관심도가 증가하였고 지진 감쇠식, 액상화 및 지진시 구조물 피해에 대한 연구가 활발히 진행중이다. 하지만 현재 국내 관측소의 경우 설치간격이 조밀하지 않기에 정밀한 지진분석에는 한계가 있다. 이에 기상청에서는 포항지진 이후 신속하게 진원지 주변에 임시관측소를 설치하고 추가로 발생한 여진을 관측하였다. 본 연구에서는 임시관측소와 상시관측소에서 관측된 여진 기록과 수집된 대상구간의 지질구조와 지반정보를 통해 포항지역의 지진 전파특성을 분석하고 기반암 운동을 추정하였다. 분석결과 포항 망천리 지역에서는 지질구조상 분지효과로 의심되는 응답특성과 여진기록이 발견되었다.

References
1
Al Atik, L. and Abrahamson, N. (2010), “An Improved Method for Nonstationary Spectral Matching”, Earthquake Spectra, Vol.26, No.3, pp.601-617.
10.1193/1.3459159
2
Brinkman, B.A., LeBlanc, M., Ben-Zion, Y., Uhl, J.T., and Dahmen, K.A. (2015), “Probing Failure Susceptibilities of Earthquake Faults using Small-quake Tidal Correlations”, Nature communications, Vol.6, pp.6157.
10.1038/ncomms715725625338
3
Cheon, Y., Son, M., Song, C.W., Kim, J.S., and Sohn, Y.K. (2012), “Geometry and Kinematics of the Ocheon Fault System along the Boundary between the Miocene Pohang and Janggi Basins, SE Korea, and its Tectonic Implications”, Geosciences Journal, Vol. 16, No.3, pp.253-273.
10.1007/s12303-012-0029-0
4
Choi, Y., Stewart, J.P., and Graves, R.W. (2005), “Empirical Model for Basin Effects Accounts for Basin Depth and Source Location”, Bulletin of the seismological Society of America, Vol.95, No.4, pp.1412-1427.
10.1785/0120040208
5
Darendeli, M.B. (2001), Development of a new family of normalized modulus reduction and material damping curves, Ph.D. thesis, University of Texas at Austin,, pp.131-153 (chapter 6).
6
Delorey, A.A., van der Elst, N.J., and Johnson, P.A. (2017), “Tidal Triggering of Earthquakes Suggests Poroelastic behavior on the San Andreas Fault”, Earth and Planetary Science Letters, Vol. 460, pp.164-170.
10.1016/j.epsl.2016.12.014
7
Eem, S.H., Yang, B., and Jeon, H. (2018), “Earthquake Damage Assessment of Building using Opendata in the Pohang and Gyeongju Earthquakes”, EESK J Earthquake Eng., Vol.22, No.3, pp.121-128.
8
Furumura, M., Sasatani, T., and Furumura, T. (1997), “Generation of Basin-Induced Surface Waves Observed in the Tokachi Basin, Hokkaido, Japan”, Journal of Physics of the Earth, Vol.45, No. 4, pp.287-305.
10.4294/jpe1952.45.287
9
Hashash, Y., Musgrove, M., Harmon, J., Groholski, D., Phillips, C., and Park, D. (2015), “Deepsoil 6.0”, User Manual.
10
Hashash, Y., Phillips, C., and Groholski, D.R. (2010), “Recent Advances in Non-linear Site Response Analysis”, Proc., 5th Int. Conf. on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, Univ. of Missouri-Rolla, Rolla, MO.
11
Hashash, Y.M. and Park, D. (2001), “Non-linear One-dimensional Seismic Ground Motion Propagation in the Mississippi Embayment”, Engineering Geology, Vol.62, No.1-3, pp.185-206.
10.1016/S0013-7952(01)00061-8
12
Hwang, K.R. and Lee, H.S. (2018), “Seismic Damage to RC Low- rise Building Structures Having Irregularities at the Ground Stroy during the 15 November 2017 Pohang, Korea, Earthquake”, EESK J Earthquake Eng., Vol.22, No.3, pp.103-111.
13
Kim, T., Chu, Y., Kim, S.R., and Bhandari, D. (2018), “Seismic behavior of Domestic Piloti-type Building Damaged by 2017 Pohang Earthquake”, EESK J Earthquake Eng., Vol.22, No.3, pp.161-168.
14
Kwak, D.Y., Stewart, J.P., Mandokhail, S.u.J., and Park, D. (2017), “Supplementing VS 30 with H/V Spectral Ratios for Predicting Site Effects”, Bulletin of the seismological Society of America, Vol.107, No.5, pp.2028-2042.
10.1785/0120160353
15
Mendoza, C. and Hartzell, S.H. (1988), “Aftershock Patterns and Main Shock Faulting”, Bulletin of the seismological Society of America, Vol.78, No.4, pp.1438-1449.
16
Park, J.Y., Kim, J.M., and Yoon, S.H. (2015), “Three-dimensional Geologic Modeling of the Pohang Basin in Korea for Geologic Storage of Carbon Dioxide”, Journal of the Geological Society of Korea, Vol.51, No.3, pp.289-302.
10.14770/jgsk.2015.51.3.289
17
Ministry of the Interior and Safety (2018), “Pohang Earthquake Response Overall Assesment Conference”, Feb 7.
18
Sohn, Y.K. and Son, M. (2004), “Synrift Stratigraphic Geometry in a Transfer Zone Coarse-grained Delta Complex, Miocene Pohang Basin, SE Korea”, Sedimentology, Vol.51, No.6, pp.1387-1408.
10.1111/j.1365-3091.2004.00679.x
19
Wells, D.L. and Coppersmith, K.J. (1994), “New Empirical Relationships among Magnitude, Rupture Length, Rupture Width, Rupture Area, and Surface Displacement”, Bulletin of the seismological Society of America, Vol.84, No.4, pp.974-1002.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 34
  • No :8
  • Pages :51-64
  • Received Date : 2018-05-14
  • Revised Date : 2018-07-09
  • Accepted Date : 2018-07-23
  • DOI :https://doi.org/10.7843/kgs.2018.34.8.51
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