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. A Intermediate scale map showing the location of the mainshock and prior historical earthquakes with magnitude 3.5 or greater. A list of 10 big earthquakes preceding the mainshock that are closest to it and have a magnitude greater than 4.0. A general map of significant historical earthquake locations in the Pacific Northwest.
Detailed area shown is just few kilometers around the mainshock.
Aftershocks The following information will be updated as new aftershocks occur. Detailed Map of the earthquakes in this catalog for the epicentral region. Seismic Activity as a function of time in the epicentral region since the time of the mainshock. In some cases more than one solution may fit the data. Information Strong-motion information from the new digital accelerographs.