论文标题
改善了印度Tripura的概率地震危险评估
An improved Probabilistic Seismic Hazard Assessment of Tripura, India
论文作者
论文摘要
Tripura的状态位于印度东北部，这被认为是世界上最活跃的地区之一。 In the present study, a realistic Probabilistic Seismic Hazard Assessment (PSHA) of Tripura State based on improved seismogenic sources considering layered polygonal sources corresponding to hypo-central depth range of 0 to 25 km, 25 to 70 km and 70 to 180 km, respectively and data driven selection of suitable Ground Motion Prediction Equations (GMPEs) in a logic tree framework is presented.分析是通过制定分层的地震源分区以及平滑网格地震性来进行的。使用有限的加速度记录，在进行彻底的定量评估后选择了大多数合适的GMPE，因此通过将它们与适当的重量因子相结合，可以解决PSHA中选择适当的GMPE的不确定性。地震危害的计算以0.05 $ \度$ x 0.05 $ \度的较高的网格间隔分辨率进行。在工程板岩水平上，概率的地震危害分布在不同时间段的峰值地面加速度（PGA）和5％的伪频谱加速度（PSA）降低了10％和50年内超过2％的概率。最终结果表明，与以前的研究相比，这是危险图的局部变化中的重新结束。可以根据危险分布计算研究区域的任何位置的工程基岩水平的设计响应谱。结果对于该地区的结构的抗震设计和建造将很有用。
The State of Tripura lies in northeast India which is considered to be one of the most seismically active regions of the world. In the present study, a realistic Probabilistic Seismic Hazard Assessment (PSHA) of Tripura State based on improved seismogenic sources considering layered polygonal sources corresponding to hypo-central depth range of 0 to 25 km, 25 to 70 km and 70 to 180 km, respectively and data driven selection of suitable Ground Motion Prediction Equations (GMPEs) in a logic tree framework is presented. Analyses have been carried out by formulating a layered seismogenic source zonation together with smooth-gridded seismicity. Using the limited accelerogram records available, most suitable GMPEs have been selected after performing a thorough quantitative assessment and thus the uncertainty in selecting appropriate GMPEs in PSHA has been addressed by combining them with proper weight factor. The computations of seismic hazard are carried out in a higher resolution of grid interval of 0.05 $\degree$ X 0.05 $\degree$. The probabilistic seismic hazard distribution in terms of Peak Ground Acceleration (PGA) and 5% damped Pseudo Spectral Acceleration (PSA) at different time periods for 10% and 2% probability of exceedance in 50 years at engineering bedrock level have been presented. The final results show significant improvements over the previous studies, which is reflecetd in the local variation of the hazard maps. The design response spectra at engineering bedrock level can be computed for any location in the study region from the hazard distributions. The results will be useful for earthquake resistant design and construction of structures in this region.
