Federal Emergency Management Administration (FEMA):  http://www.fema.gov/

 Ready American - http://www.ready.gov/

 National Weather Service:  http://www.nws.noaa.gov/

 https://www.usgs.gov/natural-hazards/earthquake-hazards 

 American Red Cross - Los Angeles Chapter:  http://www.redcross.org/ca/los-angeles

 https://www.scec.org