Some of the information here will be updated as aftershocks occur. Our data base of earthquake hypocenters contains information from the 19th century to the present. Shallow events are black. Events deeper than 35 km are green. A map showing a closer view of the earthquake and prior historical earthquakes with magnitude 3.5 or greater.
Shallow events are black.
Events deeper than 35 km are green. A list of 10 big earthquakes preceding the mainshock that are closest to it and have a magnitude greater than 4.0. A map showing the location of the mainshock relative to cities. A map showing the location of the mainshock relative to the nearest seismograph stations that recorded it. A general map of significant historical earthquake locations in the Pacific Northwest.