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 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.
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. Moment Tensor Estimates of the Earthquake size may also be available.