The Summary Japan’s meteorological agency on Thursday issued its first-ever “megaquake advisory.”The warning followed a 7.1-magnitude earthquake off the country’s southern coast.
Subduction zone faults build stress, and a so-called megathrust earthquake takes place when a locked fault slips and releases that stress.
In the U.S., the Cascadia subduction zone off the West Coast runs from Vancouver Island, Canada, to Cape Mendocino, California.
A beach is closed in Nichinan in southwestern Japan on Friday, after the country's issued its first warning about a possible megaquake.
Large Nankai Trough earthquakes tend to come in pairs, with the second often rupturing in the subsequent two years.
Persons:
AP Harold Tobin, “, ” Tobin
Organizations:
Philippine, West Coast, Kyodo, Reuters, Japan’s Earthquake Research, United States Geological Survey, AP, University of Washington
Locations:
Nankai, Japan, U.S, Cascadia, Vancouver Island, Canada, Cape Mendocino , California, Nichinan, Miyazaki