利用中国大陆1970年以来记录相对完备的294次5.0级以上的地震序列，研究地震序列类型的空间分布特征。

Based on 294 earthquake sequences with magnitude greater than or equal to 5.0 occurred in Chinese mainland since 1970, the spatial distribution features of sequence types have been studied.

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引入序列可膨胀空间的概念，给出了它的一些性质，并且证明完备映射保持序列可膨胀性。

We introduce the concept of sequentially expandable Spaces, explain some their characteristics and show that perfect mappings preserve sequentially expandable Spaces.

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