RECENT ADVANCES IN FINITE DIFFERENCE METHODOLOGIES FOR THE SIMULATION OF STRONG GROUND MOTIONS
RECENT ADVANCES IN FINITE DIFFERENCE METHODOLOGIES FOR THE SIMULATION OF STRONG GROUND MOTIONS
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发表时间：
1999
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通讯作者：
R. Graves
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作者：
R. Graves
在过去的十年中，计算资源和数值模拟算法的进步使得大规模二维和三维有限差分（FD）计算地震波传播的常规应用成为可能，以解决各种问题。 FD 方法的最新主要进展包括内存优化程序的使用和可变网格方案的开发，这两者都允许在常见桌面工作站（即非超级计算机）上实现代码，从而极大地扩展了该技术的可用性。此外，这些增强还使得 FD 建模的使用从主要的学术应用发展到与地震灾害分析直接相关的更实际的应用。 FD 方法之所以有吸引力，是因为它具有巨大的灵活性，可以结合复杂的地质结构异质性以及复杂的有限断层破裂过程。目前的模拟研究表明，FD 方法能够再现周期为 1 或 2 秒的地面运动波形。这些功能通过应用 FD 技术对破坏性地震记录的地面运动进行建模来证明。这些研究表明，为了准确再现记录的地面运动，特别是接近 1 秒的时间段，必须详细了解地下结构和震源破裂过程。
Over the last decade, advances in computational resources and numerical simulation algorithms have made possible the routine application of large scale twoand three-dimensional finite difference (FD) calculations of seismic wave propagation for a wide variety of problems. Recent major advances in the FD methodology include the use of memory optimization procedures and the development of variable grid schemes, both of which have greatly expanded the availability of this technique by allowing for code implementations on common desktop workstations (i.e., nonsupercomputers). Furthermore, these enhancements have also allowed the use of FD modeling to progress from primarily academic applications to more practical applications directly related to seismic hazard analyses. The FD method is attractive because of the tremendous flexibility for incorporating both complex geologic structural heterogeneity as well as complex, finite-fault rupture processes. Current simulation studies demonstrate that the FD method is capable of reproducing ground motion waveforms down to periods of 1 or 2 seconds. These capabilities are demonstrated by application of the FD technique to model recorded ground motions from damaging earthquakes. These studies demonstrate that detailed knowledge of both the subsurface structure and the source rupture process are necessary in order to accurately reproduce the recorded ground motions, especially for periods approaching 1 second.