Fault Plane Solutions for the Recent Earthquakes in the Central Region of South Korea

Hoe, Seo-Yun; Kyung, Jai-Bok

doi:10.5467/jkess.2008.29.5.437

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…앞서 언급한 바와 같이, 연구지 역 제4기 단층들의 대부분은 지표에서는 저각이나 지 하로 갈수록 경사각이 커지며 단층가우지대의 두께도 증가하고 있어, 제4기 동안의 응력장하에서 적절히 배 향된 기존 단층들이 재활된 것으로 해석되고 있다 . 이와 같이 다중변형을 받은 암석 에서 측정된 자기미세구조의 해석은 오랫동안 많은 연구자들 사이에서 논란이 되어왔으며, 여전히 숙제 로 남아있다 (Hrouda, 1979;Henry and Daly, 1983;Henry, 1985;Tarling and Hrouda, 1993;Soto et al, 2003;Tomezzoli et al, 2003 등) (Kim, 1980;Kim et al, 2006;Park et al, 2007;Hoe and Kyung, 2008;Jun and Jeon, 2010;Back et al, 2011 (Bae et al, 2008). 결론적으로 자기미세구조 분 석을 통해 해석된 단층운동감각으로부터 도출된 제4 기 응력장은 지진원 메커니즘, 수압파쇄시험 그리고 단층지구조 분석결과 조화되며, 한반도 일원은 제4기 동안 동-서 내지 동북동-서남서 방향의 압축성 응력 장의 지배하에 있었음을 지지한다.…”

Section: 순간변형(Instantaneousunclassified

Anisotropy of Magnetic Susceptibility (AMS) of the Quaternary Faults, SE Korea: Application to the Determination of Fault Slip Sense and Paleo-stress Field

Cho¹,

Kim²,

Kim³

et al. 2014

The Journal of the Petrological Society of Korea

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The Quaternary faults are extensively observed along major inherited fault zones (i.e. Yangsan Fault System, Ulsan Fault, Yeonil Tectonic Line, Ocheon Fault System) in SE Korea. Their geometry and kinematics provide a very useful piece of information about the Quaternary crustal deformation and stress field in and around Korean Peninsula. Using magnetic fabrics (AMS), we attempted to determine the slip senses of Jinti, Mohwa, Suseongji2, and Wangsan faults and then interpreted the fabric development process of fault gouge and the characteristics of stress field during the Quaternary. All the magnetic fabrics of the faults, except the Wangsan Fault, consistently indicate a dominant reverse-slip sense with weak strike-slip component. Most of the oblate fabrics are nearly parallel to the fault surface and the anisotropy degrees generally increase in proportion to the oblatenesses. These results suggest that the fabrics of the fault gouges resulted from a progressive deformation due to continuous simple shear during the last reactivation stage as reverse faulting. It is also interpreted that the pre-existing fabrics were overwhelmed and obliterated by the re-activated faulting. Paleostress field calculated from the fault slip data indicates an

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Section: 순간변형(Instantaneousunclassified

Anisotropy of Magnetic Susceptibility (AMS) of the Quaternary Faults, SE Korea: Application to the Determination of Fault Slip Sense and Paleo-stress Field

Cho¹,

Kim²,

Kim³

et al. 2014

The Journal of the Petrological Society of Korea

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“…The stress state of the peninsula is dependent on the interaction between the subducting Pacific and Philippine Sea plate, as well as collision of the northward-moving Indian plate with the Eurasian plate (Yin, 2010). Various investigations of the present tectonic stress, including those involving hydrofracturing/overcoring (e.g., Haimson et al, 2003;Bae et al, 2008;Chang et al, 2010), focal mechanisms (e.g., Park et al, 2007;Hoe & Kyung, 2008;Back et al, 2011;Choi, H. et al, 2012), and fault slip (e.g., Kim et al, 2016) analyses, indicate an ENE-WSW-trending maximum horizontal stress axis.…”

Section: Seismotectonic Settingmentioning

confidence: 99%

Stratigraphic Constraints of Rupture Kinematics and Scenarios of Paleoearthquakes on the Southern Yangsan Fault, SE Korea

Kim

Choi

Cheon

et al. 2021

Preprint

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After the 2016 Gyeongju Earthquake (M W 5.5) in SE Korea, the NNE-SSW-striking Yangsan Fault (YF) seismicity has emerged as a significant scientific issue and hazard. Despite previous studies of the seismicity of the YF, the paleoseismic information of the fault remain uncertain. We carried out paleoseismic investigations to characterize surface rupturing and the paleoseismic history of the northern section of the southern YF. Deflected streams and displaced river terraces indicate a dextral sense of slip, and fault splays cutting unconsolidated sedimentary strata in trench walls show an east-side-up geometry. The dextral strike-slip faulting with a minor reverse component is characterized by several noticeable stratigraphic features, including fissure-filling deposits, sag ponds, and cut-and-fill streams along the fault splay. Based on fault-sediment cross-cutting relationships and optically stimulated luminescence ages of unconsolidated sediments, we propose two possible rupture scenarios for the most recent earthquake event along the studied fault section during the Late Pleistocene: (1) a single rupture along the entire section (WS-MH-IBN-IB) at ca. 30 ka and (2) individual partial ruptures along two segments of the section (WS-MH and IBN-IB) during 33-30 and 29-17 ka, respectively. It is also noted that the timings of earlier ruptures (penultimate earthquake events) of the two segments are 37-35 and 70-52 ka, respectively. Furthermore, the timing(s) of the most recent earthquake for our studied section is much older than that of the southern section of the northern YF.

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“…Fault plane solution for the Korean peninsula was done by numerous researchers (e.g., Jun, 1990Jun, , 1991Kim, 1991;Baag et al, 1998;Lee and Chung, 1999;Chung and Kim , 2000;Kyung et al, 2001;Kang and Baag, 2004;Kang and Shin, 2006;Park et al, 2007;Hoe and Kyung, 2008;Back et al, 2011). This study used the FOCMEC (FoCal MEChanism determination) program (Snoke, 2000(Snoke, , 2003, excuting the grid search not only for the trend and plunge of B axis (vertical to main compressional P axis and main dilatational T axis) in the range of 0 .…”

Section: Fault Plane Solutionmentioning

confidence: 99%

Fault Plane Solutions of the Recent Earthquakes in the Northern Part of the Korean Peninsula

Lee¹,

Kyung²,

Cheol³

2014

Journal of the Korean earth science society

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was studied for the earthquakes that occurred from November, 2008 to May, 2013. The analysis was based on the data collected from seismic networks in Korea and China. Fault plane solutions were obtained from P and SH wave polarities and SH/P amplitude ratioes. Most earthquakes exhibited predominantly strike-slip fault characteristics with NNE-SSW or WNW-ESE nodal planes. The P-axes trends are mainly NE-SW or ENE-WSW direction in the northern part of the Yellow Sea and inland area of North Korea except some areas in the Hwanghae province. Fault plane solutions and main axis of stress field in the study region were similar to those observed in the southern part of the Korean Peninsula.

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Fault Plane Solutions for the Recent Earthquakes in the Central Region of South Korea

Cited by 8 publications

References 7 publications

Anisotropy of Magnetic Susceptibility (AMS) of the Quaternary Faults, SE Korea: Application to the Determination of Fault Slip Sense and Paleo-stress Field

Anisotropy of Magnetic Susceptibility (AMS) of the Quaternary Faults, SE Korea: Application to the Determination of Fault Slip Sense and Paleo-stress Field

Stratigraphic Constraints of Rupture Kinematics and Scenarios of Paleoearthquakes on the Southern Yangsan Fault, SE Korea

Fault Plane Solutions of the Recent Earthquakes in the Northern Part of the Korean Peninsula

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