75.2 km   E of Maupin, OR
    93.3 km ESE of The Dalles, OR
   199.2 km   E of Portland, OR

Detailed Information and Graphics about the Earthquake

Our data base of earthquake hypocenters contains information from the 19th century to the present. Included are:

• A map of the Pacific Northwest showing the location of the mainshock (in red) plus prior earthquakes M > 3.5. 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. These are the most significant historical earthquakes in the vicinity of the mainshock (see closer view map above).
• 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.
• A detailed list of all earthquakes (M > 1.0) that occurred in the two years prior to the mainshock in the area shown on the next map
• A map of all earthquakes (M > 1.0) that occurred in the two years prior to the mainshock. Detailed area shown is just few kilometers around the mainshock.
• A List of the nearest 20 strong motion sites

Foreshocks and Aftershocks

The following information will be updated as new aftershocks occur. Included are:

• An Earthquake Catalog listing the location and magnitude of all earthquakes we have located in the epicentral region (including the mainshock and any aftershocks) for the current year.
• 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.

Earthquake Mechanism

If sufficient P-wave first motion data are available, a fault plane determination for the earthquake will be available in the form of

• A diagram of the fault plane solution(s). In some cases more than one solution may fit the data.
• A table describing the fault plane solution(s) summarizing the characteristics of possible fault planes ("A" and "B") that are consistent with the recorded first-motion data.

Moment Tensor Estimates of the Earthquake size may also be available. To see, check at Oregon State U.

• Moment-Tensor Web site at Oregon State University

Preliminary Strong Motion Information

• Strong-motion information from digital accelerographs.

Related Information: Most Up-to-Date Local, National, and Global Earthquake Summaries

• Catalog and Map of Pacific Northwest earthquakes, Mag>2 from the PNSN
• Catalog and Map of United States earthquakes, from the ANSS
• Catalog and Map of world earthquakes, from the IRIS