Non-volcanic tremor ramp up precedes slow slip in Cascadia by about a day, indicating that brittle-creeping process ...

Monday’s early morning earthquake rattled a few nerves and had many Islanders thinking about the 'great' rattlers that have come and gone, as well as the 'big ones' looming ...

The shakes have left the 'Big One' on many Greater Victorian minds – a megaquake on the boundary between the Juan de Fuca and ...

The Cascadia subduction zone is locked by friction at depths lower than 18 miles. Strain slowly builds up until the fault’s ...

The Cascadia Subduction Zone ... s frictional strength is exceeded and the rocks slip past each other in a “megathrust” earthquake. Washington Geologic Survey Another common misconception ...

A 4.5 magnitude earthquake struck Monday morning near the Orcas Island in northern Washington state. The temblor occurred at about 5 a.m. and was centered near the Washington-Canada border, about 18 ...

The boundary where this occurs is called the Cascadia Subduction Zone (CSZ ... It is considered a megathrust fault, which comprises the stuck portions of the boundary between two converging ...

The last big, “megathrust” earthquake in the region, along the 600-mile-long Cascadia Subduction Zone, was in 1700. Experts say the likelihood in the next 50 years of a “megathrust” on the ...