b值空间扫描图象场源关系初探

The relation between field and source about spatial scanning Pattern of ｂ value

讨论了云南地区６．７级以上强震第Ⅲ、Ⅳ活跃期和平静期间地震前一年的ｂ值空间扫描图象，发现在强震频繁发生的云南地区，当某一个异常区发生强震时，与此同时出现的其他异常区在若干年后仍可能发生强震，这些相对于已发生的强震为中短期场兆的异常可能为未来强震的中长期源兆。对低ｂ值异常而言，ｂ值较低的异常区发生强震较早；对高ｂ值异常则动态变化的异常区发生强震较早，异常幅度和异常区大小相对稳定的异常区发生强震较晚。这些现象在增加前兆复杂性的同时，也提供了强震危险区的中长期信息。结合计算机模型和实验研究的结果对震例中的场源关系作了解释。

The spatial scanning pattern of b value one year previous to strong earthquakes with M≥ 6.7 the occurred in the third and fourth active period and quiet period after activity in Yunnan area was discussed in this paper. It is discovered that in Yunnan area where the strong earthquakes occurs frequently, when earthquake occurs in one anomalous area, after some years the coming earthquakes will occur in other anomalous areas that appeared at the same time. This field precursors of occurred earthquakes can be used as the source precursors of coming earthquakes. For low b value, strong earthquakes will occur earlier in this area where b value is lower; for high b value, strong earthquakes will occur earlier in this area where anomaly was dynamic varication clearly, while strong earthquakes will occur later in the areas where anomalous amplitude and area are stable relatively. This phenomenon would increase complexity of precursors and provide middle - long term information of coming seismic locality. Finally, the relations between field and source in seismic examples is explained by the result about computer model and experimental studies.