Quasi-Axisymmetric Finite-Difference Method for Realistic Modeling of Regional and Global Seismic Wavefield — Review and Application —
Quasi-Axisymmetric Finite-Difference Method for Realistic Modeling of Regional and Global Seismic Wavefield — Review and Application —
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DOI：
10.5772/32422
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
G. Toyokuni;H. Takenaka;M. Kanao
中科院分区：
文献类型：
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作者：
G. Toyokuni;H. Takenaka;M. Kanao
在这一章中，我们描述了最近的发展，正演模拟技术的准确和有效的计算的现实地震波场。我们对地球内部的了解由于观测和数值方法的共同进步而得到了加强。自从1875年意大利建造了第一台记录时间的地震仪（Shearer，1999）以来，记录的地震数据集几乎以指数速度增长。如此大量的地震波形数据，解释时应考虑震源机制和地球内部结构，解释观测波形道中的每个波峰或波谷。这种解释可以通过地震波形的正演模拟来实现。此外，最近在计算能力方面取得的进展使人们能够通过波形反演来调查地球的内部结构，这是一个将观测地震图和合成地震图之间的差异降到最低的逆问题。这种方法需要迭代计算的合成地震记录的每一个结构模型更新在theminimization过程中，所以我们需要一个正演模拟技术，产生准确的波形与小的计算时间和内存。
In this chapter, we describe recent developments of forward-modeling techniques for accurate and efficient computation of the realistic seismic wavefield. Our knowledge on the Earth’s interior has been enhanced by mutual progress in observation and numerical methods. Since the first time-recording seismograph was built in Italy in 1875 (Shearer, 1999), the recorded seismic dataset has been growing at an almost exponential rate. Such a massive amount of seismic waveform data should be interpreted with consideration of the seismic source mechanism and Earth’s inner structure, which explain each crest or trough in observed waveform traces. This interpretation can be achieved by forward modeling of seismic waveforms. In addition, recent progress in computation capacity has enabled investigation of the Earth’s inner structure via waveform inversion, an inverse problem minimizing the difference between observed and synthetic seismograms. This method requires iterative computations of synthetic seismograms for each structural model renewal in theminimization process, so we need a forward modeling technique that produces accurate waveforms with small computation time and memory.