As a consequence of logistical and technical issues with the monitoring network, we have different numbers of observations for each earthquake: 164 wells for the 2007 Sumatra earthquake, 245 wells for the 2008 Wenchuan earthquake, 228 wells for the 2011 Tohoku earthquake and 223 wells for the 2012 Sumatra earth-quake. The details of coseismic responses following each earth-quake are listed in Table1.