冯锐1, T. V. McEvilly2. 1984: 由地震反射波剖面研究圣安德烈斯断层带的结构. 地震学报, 6(3): 249-263.
引用本文: 冯锐1, T. V. McEvilly2. 1984: 由地震反射波剖面研究圣安德烈斯断层带的结构. 地震学报, 6(3): 249-263.
FENG RUIup, T. V. MCEVILLYup2com s. 1984: INTERPRETATION OF SEISMIC REFLECTION PROFILING DATA FOR THE STRUCTURE OF THE SAN ANDREAS FAULT ZONE. Acta Seismologica Sinica, 6(3): 249-263.
Citation: FENG RUIup, T. V. MCEVILLYup2com s. 1984: INTERPRETATION OF SEISMIC REFLECTION PROFILING DATA FOR THE STRUCTURE OF THE SAN ANDREAS FAULT ZONE. Acta Seismologica Sinica, 6(3): 249-263.

由地震反射波剖面研究圣安德烈斯断层带的结构

INTERPRETATION OF SEISMIC REFLECTION PROFILING DATA FOR THE STRUCTURE OF THE SAN ANDREAS FAULT ZONE

  • 摘要: 1978年,在美国中加利福尼亚完成了一条横跨圣安德烈斯断层带的地震反射波剖面.由于断层带存在着强烈的侧向非均匀性和低速结构,观测结果极为复杂.这种断层带上的侧向速度急剧变化还有其它表征,诸如震中定位的偏移、地震节平面的变形等等.在这种情况下,处理反射波资料的常规计算与解释方法,已经难以实施.本文采用 May 和 Covey(1981)11的射线反演方法,根据其它地球物理资料建立初始模型,再利用真实振幅的迭加剖面,推断出其阻抗对比的分布,通过反复迭代反演,获得了速度模型.反演计算的非唯一性固然存在,但该结果与断层带地区的各种地球物理证据是一致的,并揭示了圣安德烈斯断层带的细致结构.

     

    Abstract: A seismic reflection profile crossing the San Andreas fault zone in central California was conducted in 1978. Results are complicated by the extreme lateral heterogeneity and low velocities in the fault zone. Other evidence for severe lateral velocity change across the fault zone lies in hypocenter bias and nodal plane distortion for earthquakes on the fault. Conventional interpretation and processing methods for reflection data are hard-pressed in this situation. Using the inverse ray method of May and Covey (1981), with an initial model derived from a variety of data and the impedance contrasts inferred from the true-amplitude stacked section, an iterative inversion process yields a velocity model which, while clearly non-unique, is consistent with the various lines of evidence on the fault zone structure.

     

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