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Matlab Visualization of Seismic Positioning

Abstract: Earthquake positioning is one of the most basic research contents in seismology, and it is of great significance for the study of the characteristics of seismic activity, the internal structure of the earth, the geometric structure of the source and other basic issues in seismology. However, direct calculation to obtain the source location information and earthquake occurrence time requires a large amount of calculation and is not easy to implement. In this study, we implemented the INGALADA method positioning through MABLAT to achieve the purpose of determining the location of the earthquake source and the time of occurrence. This earthquake positioning method can be realized by non-professionals. It does not require the operator to have a deep computer and mathematics knowledge. It can directly obtain the actual arrival time of the station P wave, S wave and the position data of the station and import it into the designed GUI display interface. Due to the convenience and intuitiveness of the GUI interface, non-professionals can directly obtain the source location and time of earthquake calculated by the INGALADA algorithm. Seismic positioning can provide some important geographic location information to facilitate the study of geological structure, and is of great significance to the study of earthquake occurrence.

1. 引言

2. 地震定位的原理

${R}_{i}=V\ast \left({P}_{gi}-{S}_{gi}\right)$ (2.2)

${t}_{0}={P}_{gi}-\frac{{R}_{i}}{{v}_{p}}$ (2.3)

3. 地震定位Mablat可视化

1) 震源位置 $\left({x}_{0},{y}_{0},{z}_{0}\right)$ (限制输出数据长度保留两位小数)；

2) 发震时刻(t0) (限制输出数据长度保留两位)。

4. 实例测试

Figure 4. P and S wave travel time curve

Table 1. P, S wave travel time data table

Figure 5. Measured data results display diagram

5. 结论

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