RING OF FIRE SUBDUCTION ZONE & HARMONIC TREMORS

http://en.wikipedia.org/wiki/Harmonic_tremor

http://www.keprtv.com/news/local/Earthquake-swarm-strikes-off-Wash-state-coas...

http://www.geology.sdsu.edu/how_volcanoes_work/subducvolc_page.html

http://www.eurekalert.org/pub_releases/2012-02/uoc--lfi021412.php

http://www.godlikeproductions.com/forum1/message1962594/pg2

http://www.wftv.com/news/news/local/sinkhole-threatens-home-forces-family-eva...

MASSIVE SINKHOLE THREATENS SCHOOL
http://www.johnsoncitypress.com/News/article.php?id=101910

VOLCANIC PLUMBING EXPOSED
http://www.sciencecodex.com/volcanic_plumbing_exposed-88923