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Stability and correlation properties of microtremor response
강태섭,Jin Soo Shin 한국지질과학협의회 2011 Geosciences Journal Vol.15 No.1
This study analyzed microtremor records from four stations located at the center and vertices of an equilateral triangle with 52-m sides. The stability of the horizontal-to-vertical spectral ratio (HVSR) was estimated for 12 days of continuous records. The results showed no variation in the frequency and amplitude of the peak spectral ratio over time. Although the amplitude patterns varied slightly at each station, the peak frequencies were consistent within the small four-station array. The results suggest that slight variations in subsurface structure beneath the array may have influenced the HVSR amplitudes. The HVSR estimate had little or no dependency of meteorological variations in atmospheric pressure, temperature, wind speed, rainfall, and humidity measured at a meteorological observatory approximately 1.3 km from the array. Spatial autocorrelation (SPAC) analyses indicated that time averaging of continuous micrometer records from a single pair of stations could serve as an alternative to spatial averaging for the entire array. This result implies that, with the SPAC approach, microtremor records from a single pair of stations rather than a larger array can be applied.
강태섭,신진수 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.2
An unusual earthquake sequence comprising 11events with magnitude range of ML 2.0 to 3.2 ocurred of the east-ern coast of the southern Korean Peninsula in April 2006. Sincethere is no obvious mainshock in this sequence unlike a typicalmainshock-aftershock sequence, the seismicity patern shows thecharacteristics of swarm behavior. Focal mechanism of the largestevent (ML 3.2) on Hypocenter relocations of nine events improve the epicenter loca-tions that fal within an area with a radius of about 0.7 km whiledepths are les well constrained with ranges of 1.6 km to 13.0 km.We propose that a swarm behavior of the sequence is closelyrelated to the marginal geometry of the Ulleung Basin and theregional stress regime. The fact that epicenters of the April 2006sequence are at the same transitional zone of continental to riftedcontinental crust as that of the 29 May 2004, Mw 5.1, earthquakeindicates that the Uleung Fault is seismically active.
The 29 May 2004, Mw=5.1, offshore Uljin earthquake, Korea
강태섭,Chang-Eob Baag 한국지질과학협의회 2004 Geosciences Journal Vol.8 No.2
We present results of a preliminary analysis for sourceparameters of the 29 May 2004 offshore Uljin earthquake. Theanalysis is based on a set of broadband and short period velocityseismograms, and accelerograms recorded by seismic networks insouthern Korea. The estimated parameters of the mainshock are asfolows: origin time 19:14:25.82 in Korean local time (10:14:25.82UT), latitude 36.626N, longitude 130.054 E, depth 18 km, mag-nitude Mw 5.1, stress drop 28 bars, one focal plane 337 , 56 and78 , and the other plane 178 , 36 and 107 in strike, dip and rake,respectively. Three aftershocks of Mw 2.3, 2.0 and 2.4 occurredwithin source region of the mainshock, and two other events of Mw2.5 and 3.5 at epicenters beyond the rupture area are presumed tobe triggered dynamically by the 29 May 2004 earthquake. Thelargest ground acceleration, 2.62 %g, was instrumentally recordedat Pohang, 90.4 km south-west of the mainshock epicenter. Themaximum instrumental intensity is estimated as V and VI in Mod-ified Mercalli Intensity scale excluding and including local effects,respectively. There is a possibility that the mainshock-aftershocksequence and one of the dynamically triggered events are directlyrelated to the Ulleung Fault.
지하 LPG 저장공동에서의 Clogging 추정을 위한 역해석 수치모형
강태섭,한일영 한국지하수토양환경학회 1997 지하수환경 Vol.4 No.3
지하 LPG 저장공동의 모니터링 자료를 이용하여 투수계수를 추정하기 위한 Galerkin 유한요소역해석 수치모형(SK-EST)이 개발되었다. 이 역해석 수치모형은 해석영역 전체구간에 대해 수두(압)분포를 근사하여 구성된 행렬방정식을 계산함으로서 투수계수를 산출한다. 실제 적용성을 검증하기 위해 현재 운영중인 지하 LPG 저장공동 간극수압계의 모니터링 자료를 이용한 역해석을 실시하였다. 또한 간극수압계의 작동상태를 확인하기 위해 측정된 심도별 수압측정 자료를 이용하여 심도별 투수계수 변화를 개발된 수치모형(SK-EST)을 이용하여 추정하고 수압시험 결과와 비교하였다. A numerical model (SK-EST) for estimating hydraulic conductivity using monitoring data of underground LPG storage cavern was developed. The model calculates hydraulic conductivity from matrix equation which is established from the distribution of hydraulic potential. To verify the applicability of this model, an inverse analysis was performed using the monitoring data of pressure cell of an operating underground LPG storage cavern. And also using the water pressure parker test data which were obtained to look over the operation capability of pressure cell, conductivity variation with depth was estimated using the developed numerical model (SK-EST) and was compared with in situ results.