Forecast of the intermediate-to-strong earthquakes based on the Pattern Informatics (PI) algorithm was tested against the April 20，2013，Lushan，Sichuan，China，MS7.0 earthquake.It is shown that the PI hotspots distribute around the epicenter of the Lushan earthquake. Comparison between the PI forecast of the 2008 Wenchuan earthquake and the 2013 Lushan earthquake suggests the importance of background deformation/strain rate in the PI forecast.
蒋卉，吴忠良，马腾飞，蒋长胜. 对图像信息学(PI)算法的一个回溯性预测检验：四川芦山7.0级地震[J]. 物理, 2013, 42(05): 334-340.
JIANG Hui，WU Zhong-Liang，MA Teng-Fei，JIANG Chang-Sheng. Retrospective test of the PI forecast：case study of the April 20，2013，Lushan，Sichuan，China，MS7.0 earthquake. Physics, 2013, 42(05): 334-340.
2013, Vol. 42 
