Figure 4 | Scientific Reports

Figure 4

From: Rapid Learning of Earthquake Felt Area and Intensity Distribution with Real-time Search Engine Queries

Figure 4

A schematic diagram of drawing isoseismal lines in Q-Felt Map. Generally, a Q-Felt Map can be represented by several concentric ellipses, the boundaries of which are segmented by isoseismal lines that indicate different extent of earthquake reports. With the direction of semi-major axis and flattening of ellipse learned by PCA from screened search queries, we can draw isoseismal lines by checking the change points in the distribution of accumulative weight sum of queries (shown in the right side). All the maps were created by Baidu Map Open Platform JavaScript API v3.0 (http://lbsyun.baidu.com/index.php?title=jspopular3.0).

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