The main features are the clustering in time, the migrating in space and the orderliness in migratory route.
地震活动的主要特点表现为时间上的成丛性、空间上的迁移性及丛内迁移的有序性；
2
The input space of fuzzy system is partitioned by means of real time recursive fuzzy clustering, and the parameters of fuzzy model are confirmed by Kalman filtering.
利用递推模糊聚类算法实时对系统的输入空间进行模糊划分，利用卡尔曼滤波算法确定参数。
3
The clustering concept is applied to the measurements of the laser warner, and space-time fusion for the measurements in the same cluster is made.