View Seismograms of station WIW for current time - View web-based seismograms by station and date.

Tectonic summary - Brief interpretation for this swarm.

Maps and History of Earthquakes in this Region

• A map of the Pacific Northwest showing the location of the swarm area (very small, in red) plus prior earthquakes M > 3.0. 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 3.0 or greater. Shallow events are black. Events deeper than 35 km are green.
  
• A list of 10 big earthquakes preceding the swarm that are closest to it and have a magnitude greater than 3.0. These are the most significant historical earthquakes in the vicinity of the swarm (see closer view map above).
  
• A map showing the location of the swarm relative to cities.
  
• A map showing the location of the swarm 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 swarm 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 swarm. Detailed area shown is just few kilometers around the swarm.
  
• A list of the nearest 20 strong motion sites
  

Swarm Activity - The following information will be updated as new events occur. Included are:

• Comparison map of locations from the current swarm (orange), the 1970 swarm (green), the 1975 swarm (blue) and the 1988 swarm (red). Short-period seismic station WIW is red triangle.
  
• Map of the best locations from the current swarm color coded by the month they occurred.
• An Earthquake Catalog listing the location and magnitude of all earthquakes we have located in the epicentral region during the current year.
  
• Detailed Map of all earthquakes in this catalog for the epicentral region.
  
• Seismic Activity (magnitude, rate, depth) as a function of time since the start of the swarm.

Focal Mechanism - A diagram and table of the P-wave fault plane solution. If sufficient P-wave first motion data are available, a fault plane determination for the earthquake will be available.

Strong-Motion Information - for some earthquakes a ShakeMap based on recorded data from digital accelerographs is available.

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

• Latest Quakes from the Pacific Northwest, the nation and the world