A recent study suggests that a strong tidal force can exaggerate an already loaded earthquake as a result pushing a small one to evolve into an acute tremor.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/strong-tides-could-trigger-severe-earthquakes-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/big-news-network
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-disasters
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/earthquakes
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indonesia