00:00Scientists have found evidence of a possible link between two major West Coast faults.
00:04The Cascadia subduction zone and northern San Andreas may sometimes rupture close together.
00:10Researchers studied ocean sediments preserving about 3,100 years of earthquake history.
00:16They identified unusual sediment layers known as doublets.
00:20These layers suggest some earthquakes happened within minutes to hours of each other.
00:24Three possible paired events occurred during the past 1,500 years.
00:28One appears to have happened around the massive Cascadia earthquake of 1,700.
00:33The findings do not mean every major quake will trigger another fault.
00:37But closely spaced ruptures could create a much larger emergency.
00:40San Francisco, Portland, Seattle, and Vancouver could face impacts simultaneously.
00:46Researchers say earthquake planning should consider this potential compressed time frame.
00:50Disclosure. This video contains stock footage and content created or enhanced using AI-assisted tools.
