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Human movement is used as an indicator of human activity in modern society.The velocity of moving humans is calculated based on position informationobtained from mobile phones. The level of human activity, as recorded byvelocity, varies throughout the day. Therefore, velocity can be used toidentify the intervals of highest and lowest activity. More specifically, weobtained mobile-phone GPS data from the people around Shibuya station in Tokyo,which has the highest population density in Japan. From these data, we observethat velocity tends to consistently increase with the changes in socialactivities. For example, during the earthquake in Kumamoto Prefecture in April2016, the activity on that day was much lower than usual. In this research, wefocus on natural disasters such as earthquakes owing to their significanteffects on human activities in developed countries like Japan. In the event ofa natural disaster in another developed country, considering the change inhuman behavior at the time of the disaster (e.g., the 2016 Kumamoto GreatEarthquake) from the viewpoint of velocity allows us to improve our planningfor mitigation measures. Thus, we analyze the changes in human activity throughvelocity calculations in Shibuya, Tokyo, and compare times of disasters withnormal times.

Measurement of human activity using velocity GPS data obtained from mobile phones