20 May 2005 ^ West, Michael; Sanches, John J.; McNutt, Stephen R. " Periodically Triggered Seismicity at Mount Wrangell, Alaska, After the Sumatra Earthquake ." Science . Vol. 308, No. 5725, 1144–1146. 20 May 2005. ^ a b Nalbant, S., Steacy, S., Sieh, K., Natawidjaja, D., and McCloskey, J. " Seismology: