From the intensity VI region to the intensity IX region, the area gradually decreases, and at the same time, mobile phone signal data in this region show a decreasing trend.
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Research on the application of mobile phone location signal data in earthquake emergency work: A case study of Jiuzhaigou earthquake.
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The sentences
Phase a is mainly distributed in the range from 0 to 2; that is, the change in the number of signals in the same area shows an increasing trend.