How Often Do Cascadia’s Megaquakes Occur?

16 May 2018–Devastating magnitude 8.0 to 9.0 megathrust earthquakes and accompanying tsunamis appear to have hit the U.S. Pacific Northwest and Southwest Canada about every 500 years on average. But some scientists think the recurrence interval between some of these large earthquakes may be shorter—along the lines of every 300 … Continue Reading »

How Big Can a Tsunami Be in the Caribbean?

16 May 2018–The 2004 Indian Ocean tsunami has researchers reevaluating whether a magnitude 9.0 megathrust earthquake and resulting tsunami might also be a likely risk for the Caribbean region, seismologists reported at the SSA 2018 Annual Meeting. “Before 2004, we thought an earthquake of about 8.0 was about right for … Continue Reading »