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Earthquakes caused by plate tectonics are unexpected events. Earthquakes give some precursor signals that occur above ground or underground due to stress such as movement, bending, stress, electromagnetic wave emission. They are detected by various methods. But these signs can not be always associated with earthquakes. Therefore, scientists are trying to improve the earthquake Üçgen Alan Değişimi Yönteminin Deprem Ön Kestiriminde Kullanılabilirliği: 23.10.2011-13:41 Mw=7.2 Van Depremi Örneği Usability of Triangular Area Change Method in Earthquake Prediction: 23.10.2011-13: 41 Mw = 7.2 Van Earthquake Example Ahmet Yücel Ürüşan1* DEÜ FMD 22(66), 813-824, 2020 814 prediction by searching for more quantity. Significant results have been obtained especially in recent years. Although not discussed much, one of the best methods is to investigate if there is a changing in the area of triangles to be created between these stations if there are fixed GPS reference stations around the earthquake epicenter. In this research, this method has been used to investigate the ground movements before and during the Van earthquake which occured 7.2 M magnitude at 13:41 on 23rd October 2011. For this purpose, the data of Continuously Operating Reference Station (CORSTR) was used. The data of 14 stations in the near plan located on both sides of the fault plane where the Van earthquake occurred has been taken into consideration and daily motion vectors have been examined. The variation of the distances between the stations and the daily change rates in the triangular areas formed by them have been calculated. The results show that pre-earthquake displacement anomalies heve been detected and these may be the precursor signs of the earthquake, but it has also seen that the biggest displacement was during the earthquake. Then, these solutions have been compared with the seismic data that belong before the earthquake. According to the seismic data, many minor earthquakes with magnitudes between 2≤M≤4 occurred before the earthquake, and this case is absolutely coherent with the daily area change rates of the triangles which have been obtained from CORS data.