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Spatial Distribution of First-level Topics

Figure 7. Kernel density analysis of topics (search radius = 200 km).

Kernel density analysis (radius of 200 km) was carried out on Weibo with geographical locations in each topic, as shown in Figure 7. The spatial distribution of ‘events notification’, ‘popularization of prevention and treatment’, ‘government response’, ‘personal response’ and ‘opinion and sentiments’ is similar to the general characteristics of Figure 4b, forming hot spots in Beijing-Tianjin-Hebei, Shandong, Henan, Hubei, Yangtze River Delta, Sichuan, and Guangdong, but there are differences within the topics. ‘Events notification’ takes Beijing, Wuhan, Shanghai, and Sichuan as prominent high-value areas, and the areas of the Beijing-Tianjin-Hebei cross border area, east Hubei, and the Jiangsu- Zhejiang-Shanghai cross border areas are the main nodes in a continuous pattern. ‘Popularization of prevention and treatment’ is presented with Beijing, Guangzhou, and Shanghai as the prominent high values, supplemented by Wuhan, Chengdu, Hefei, Zhengzhou, and other high-value areas. ‘Government response’ has Beijing, Sichuan, and Xi'an as high values, though Zhengzhou, Wuhan, Changsha, Shanghai, Guangzhou, Haikou, and other cities have responded significantly. ‘Personal response’ is prominently reflected by Beijing, Shanghai, Guangzhou, and Wuhan, with Beijing, Wuhan, and Shanghai as the centre and Guangzhou and Chengdu as relatively independent high-value areas. ‘Opinion and sentiments’ was more prominent in high-value areas around Wuhan, followed by the Yangtze River Delta, Beijing-Tianjin-Hebei, and the Pearl River Delta urban agglomeration. ‘Seeking help’ and ‘making donations’ show totally different characteristics. ‘Seeking help’ appears significantly around Wuhan and shows a trend of diffusion to the surrounding areas, especially to the north. ‘Making donations’ has Beijing and Hainan as high values and spreads across the country, but is relatively concentrated in urban areas around Wuhan, the Yangtze River Delta region, Chengdu-Chongqing region, Guangzhou, Zhengzhou, and even Haikou in the south.