Figure 2: Collected EM measurements for 30 days duration prior to: (a) the Crete earthquake of 01/07/2009, (b) Crete earthquake of 12/10/2013 and (c) Limnos earthquake of 24/05/2014. Each monitoring starts on day 1 and ends on day 30. On day 31 the main earthquake event occurred (not shown). Figure (a) is from [17]. Earthquake details are analyzed in the text.