Basic Information

     2.6 km WSW of Darrington, WA
    30.6 km  NE of Granite Falls, WA
    88.7 km  NE of Seattle, WA

Vist the WEBICORDERS to see near-real-time earthquake trace data

• Community Internet Intensity Map: Human Reports of Experienced Shaking Intensity - By Zip Code
  • DID YOU FEEL IT? Fill out a Earthquake Form
• Shake Map: Instrumental Measurements of Shaking Intensity

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 earthquake (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 3.5. These are the most significant historical earthquakes in the vicinity of the mainshock (see the closer view map above).
• A map showing the location of the earthquake relative to cities.
• A map showing the location of the earthquake relative to the nearest seismograph stations that recorded it.
• A detailed list of all earthquakes (M > 1.0) that occurred in the vicinity of the special earthquake in the previous two years. For the locations of these events see the next map.
• A map of all earthquakes (M > 1.0) that occurred in the two years prior to the special earthquake. Detailed area shown is just few kilometers around the mainshock.
• A List of the nearest 20 strong motion sites

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