According to Earth quake prediction website, Based on their published Research technique , they applied it as a systematic predicting tool for determining the dates of earthquakes. Their methods are experimental and they test them in real time. In the following diagram you can see Vanuatu Earthquake predictions for the period of February 2017.
For this period they observe that there is a Small-Medium* probability to have an earthquake >4R in the region of Vanuatu on 5th 13th, 17th and 25th February 2017, according to their methods. Other dates are shown in the chart Above.