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本文搜集了1952—1971年发生在我国境内及边境地区266次地震的观测资料,得到国内外五百多个地震台的 P 和 S 震相到时约二万条;根据我国地区大爆炸观测及其他地壳结构的研究成果,结合上述地震观测资料,提出了中国地区双层平均地壳速度模型,以便由深度走时校正把各种震源深度上的走时折算为表面震源走时,并进行“剥壳”处理.用迭代法校正震中和发震时刻.采用1970年寇蒂斯(curtis)所述的立方样条函数平滑数据的方法,得到表面震源 P 波和 S 波的走时表.运用海格劳兹-维谢尔特-贝特曼(Herglotz-Wiechert-Bateman)速度反演的方法求得中国地区地幔中,P 波和 S 波速度随深度的分布.算出震中距离Δ=0°—104°,各种震源深度的一整套 P 波和 S 波走时表.经过试用的实践表明,用它来测定震中参数比用国外的走时表具有较高的精确度.
This paper collects the observed data of 266 earthquakes that occurred in our country and in the border areas from 1952 to 1971. The P and S seismic phases of more than 500 seismic stations at home and abroad are about 20,000 at the same time. Based on the observation of the large-scale explosions in our country and According to the research results of other crustal structures and combined with the above-mentioned seismic observation data, a double-layer average crustal velocity model is proposed in China so that the traveltime of various focal depths can be converted into the surface seismic traveltime by “deep traveltime correction” and “peeled” Correcting the epicenter and onset time using iterative method.The traveltimes of P and S waves from surface sources were obtained by smoothing the data using the Cubic spline method described by Curtis in 1970. Using the Haglioz- Wiechert-Bateman velocity inversion was used to determine the distribution of P-wave and S-wave velocities with depth in the mantle of China. The epicenter distance Δ = 0 ° -104 ° A set of P-wave and S-wave travel time scales with different source depths are shown in this paper. After trial practice, it is found that using it to measure epicenter parameters is more accurate than using travel time tables abroad.