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논문 기본 정보

자료유형
학술저널
저자정보
최항 ((주) 아이맥스트럭처) 윤병익 ((주)아이맥스트럭처)
저널정보
한국지진공학회 한국지진공학회 논문집 한국지진공학회논문집 제24권 제6호
발행연도
2020.11
수록면
253 - 266 (14page)
DOI
https://doi.org/10.5000/EESK.2020.24.6.253

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The extended slip-weakening model was investigated by using a compiled set of source-spectrum-related parameters, i.e. seismic moment Mo, S-wave velocity Vs, corner-frequency fc, and source-controlled high-cut frequency fmax, for 113 shallow crustal earthquakes (focal depth less than 25 km, MW 3.0~7.5) that occurred in Japan from 1987 to 2016. The investigation was focused on the characteristics of stress drop, radiation energy-to-seismic moment ratio, radiation efficiency, and fracture energy release rate, Gc. The scaling relationships of those source parameters were also investigated and compared with those in previous studies, which were based on generally used singular models with the dimensionless numbers corresponding to fc given by Brune and Madariaga. The results showed that the stress drop from the singular model with Madariaga’s dimensionless number was equivalent to the breakdown stress drop, as well as Brune’s effective stress, rather than to static stress drop as has been usually assumed. The scale dependence of stress drop showed a different tendency in accordance with the size category of the earthquakes, which may be divided into small-moderate earthquakes and moderate-large earthquakes by comparing to Mo = 1017~1018 Nm. The scale dependence was quite similar to that shown by Kanamori and Rivera. The scale dependence was not because of a poor dynamic range of recorded signals or missing data as asserted by Ide and Beroza, but rather it was because of the scale dependent Vr-induced local similarity of spectrum as shown in a previous study by the authors. The energy release rate Gc with respect to breakdown distance Dc from the extended slip-weakening model coincided with that given by Ellsworth and Beroza in a study on the rupture nucleation phase; and the empirical relationship given by Abercrombie and Rice can represent the results from the extended slip-weakening model, the results from laboratory stick-slip experiments by Ohnaka, and the results given by Ellsworth and Beroza simultaneously. Also the energy flux into the breakdown zone was well correlated with the breakdown stress drop, and peak slip velocity of the fault faces. Consequently, the investigation results indicate the appropriateness of the extended slip-weakening model.
#Extended slip-weakening model #Stress drop #Energy budget #Energy flux #Scaling relationships

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참고문헌 (52)

참고문헌 신청
Ohnaka M / 1989 / A cohesive zone model for dynamic shear faulting based on experimentally inferred constitutive relation and strong motion source parameters / J. Geophys. Res 94(B4):4089~4104 google schola Papageorgiou A / 1983 / A specific barrier model for the quantitative description of inhomogeneous faulting and the prediction of strong ground motion. I. Description of the model / Bull. Seism. Soc. Am 73(3):693~722 google schola 최항 / 2020 / Slip-Weakening 모델의 확장과 단층 파열속도의 추정 / 한국지진공학회논문집 24(5):219~232 dbpia Eshelby JD / 1957 / The determination of the elastic field of an ellipsoidal inclusion, and related problems / Proc. Roy. Soc. A 241:376~396 google schola Keylis-Borok BV / 1959 / On the estimation of the displacement in an earthquake source and of source dimensions / Ann. Geofisca 12:205~214 google schola

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