For decades, Northern California has been bracing for the "Big One"—an earthquake of magnitude 7.0 or larger expected on one of the many fault zones that snake through the region.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/several-earthquakes-are-bigger-threat-san-francisco-bay-area
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-wall-street-journal-hong-kong
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/earthquakes
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-disasters
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/california