CAJ | 학술논문

近断层区域地震动的分布特征对断层附近工业矿区及矿区内工业建筑的抗震设计具有重要意义。针对甘肃省华亭地区及其附近区域展开研究，分析历史地震、地震构造及小震活动等，结合中国大陆地区中-长期危险性研究给出的大震危险区判定成果，预测了设定地震发生时近断层地震动的分布情况。结果表明，当六盘山南段断层发生 M7地震时，潜在破坏性地震动的影响范围集中在震中及断层附近区域，沿断层走向展布。峰值加速度的范围约为0～1500 cm/s2，其中华亭地区峰值加速度约为100 cm/s2，华亭地区东侧的宁县南煤矿和宁县中煤矿的峰值加速度约为50 cm/s2。
근단층구역지진동적분포특정대단층부근공업광구급광구내공업건축적항진설계구유중요의의。침대감숙성화정지구급기부근구역전개연구，분석역사지진、지진구조급소진활동등，결합중국대륙지구중-장기위험성연구급출적대진위험구판정성과，예측료설정지진발생시근단층지진동적분포정황。결과표명，당륙반산남단단층발생 M7지진시，잠재파배성지진동적영향범위집중재진중급단층부근구역，연단층주향전포。봉치가속도적범위약위0～1500 cm/s2，기중화정지구봉치가속도약위100 cm/s2，화정지구동측적저현남매광화저현중매광적봉치가속도약위50 cm/s2。
The study of distribution of strong ground motion is one of the crucial tasks in earth-quake engineering.Near-fault strong ground motion is the basis for establishing building codes for the field of earthquake engineering and it has significant applicability in the field of earthquake en-gineering.It is important to estimate a suitable building code for an industrial area,and even for a mining area,which may be located in or near potential sources of earthquakes.Several studies have focused on the physics of strong ground motion during an earthquake.Results of such studies have demonstrated a strengthening phenomenon of earthquake activity and the outputs of cool mines in Huating region,Pingliang City,Gansu province,from 2001 onward.The acceptable con-clusion is that this strengthening phenomenon is caused by mining in Huating region.In this stud-y,we analyze the earthquake activity of Huating region in Gansu province on the basis of earth-quake data from 2001 onward that were downloaded from earthquake networks centers of Gansu province and the China earthquake networks center.Specifically,the mining-induced earthquake data from 2001 to 2008 are based on the catalog and study results of earthquake networks centers of Gansu province,and the mining-induced earthquake catalog from 2009 to 2013 is based on the results of the China earthquake networks center.As an example,the distribution of strong ground motion around the Liupanshan southern segment fault was predicted under simulated earthquake activity that included recent earthquake trends in the northern segment of the north-south seismic belt.A special finite fault source model was constructed for this simulated earthquake located on the Liupanshan southern segment fault.Further,the strong ground motion,including accelera-tion and velocity,near the causative fault was calculated using the finite fault source model.Next, the characteristics of these simulated accelerations and velocities were studied and their respective peak values were calculated.As another useful and essential example,the near-fault ground mo-tion distribution of Changchun City was predicted under a setting earthquake.After the occur-rence of an Ms 6.0 earthquake on the Jianshanzi-Kalun fault,the influence range of potentially destructive ground motion lied near the fault,and the distribution of this influence range was a-long the fault.The peak acceleration reached 200 cm/s2 .Based on these results,we considered an M7 earthquake to occur on the Liupanshan southern segment fault,whose influence range was a-long the fault;the variation in the peak acceleration along the fault of the Liupanshan eastern seg-ment of the west Qinling seismic gap was up to 1 500 cm/s2 .The study area included three mining regions:the Huating region,Ningxian south mining region,and Ningxian middle mining region. The Huating region is located near the eastern boundary of the Liupanshan eastern segment of the west Qinling seismic gap,almost 30 km.The peak ground acceleration in Huating region is 100 cm/s2 ,and those in the Ningxian south and Ningxian middle mining regions are 50 cm/s2 each. The numerical modeling developed in this study has high potential for applicability in the estima-tion or prediction of ground motion for earthquake engineering.Furthermore,the numerical algo-rithm could also be used to generate a near-real-time shaking map at the implementation level if the current finite fault inversion technique is applied.