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Wells, Nevada Earthquake February 21, 2008 A 6.0 magnitude earthquake strikes the northeastern edge of the Basin and Range.

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Presentation on theme: "Wells, Nevada Earthquake February 21, 2008 A 6.0 magnitude earthquake strikes the northeastern edge of the Basin and Range."— Presentation transcript:

1 Wells, Nevada Earthquake February 21, 2008 A 6.0 magnitude earthquake strikes the northeastern edge of the Basin and Range

2 Wells, Nevada Earthquake Basin and Range Parks and Plates ©2005 Robert J. Lillie The earthquake occurred near the edge of the Basin and Range province. Over the Basin and Range province the continent is actively rifting. Why Nevada?

3 Continental Rift Features Parks and Plates ©2005 Robert J. Lillie Hot Asthenosphere Wells, Nevada Earthquake Basin and Range Tectonics

4 Parks and Plates ©2005 Robert J. Lillie Wells, Nevada Earthquake Basin and Range Tectonics Continental Rift Features

5 Wells, Nevada Earthquake Historical Seismicity near Wells, Nevada

6 Wells, Nevada Earthquake The earthquake occurred near the center of more than 400 recording seismometers. http://eqseis.geosc.psu.edu/~ cammon/QA/wellsNV- 21Feb2008.html

7 Wells, Nevada Earthquake Seismic Data

8 Wells, Nevada Earthquake Strainmeters

9 Wells, Nevada Earthquake Strainmeters

10 (Hammond and Kreemer, University of Nevada Reno) Wells, Nevada Earthquake Horizontal Displacement The actual source mechanism (USGS) The modeled source mechanism

11 Source: C. Kreemer, Nevada Geodetic Laboratory, UNR.  Map of contours of the rate of strain accumulation. The redder the colors the more rapidly the crust is accumulating strain. This strain is generally released in future earthquakes. The map is produced by interpolation of horizontal motions measured at hundreds of points using GPS. The Wells earthquake (star) happened in an area where the GPS measurements indicate the same amount of strain accumulation as within the stable continent. Geodetic Strain Rates in Great Basin Wells, Nevada Earthquake Geodetic Strain

12 They are a part of EarthScope - a national earth science experiment. EarthScope is: Exploring the structure and evolution of the North American continent. Understanding the processes that cause earthquakes and volcanic eruptions. Wells, Nevada Earthquake EarthScope Why are there so many geophysical instruments in the West, anyway?

13 What instruments does EarthScope have? Wells, Nevada Earthquake EarthScope Drilling into the San Andreas Fault Portable Seismometers Permanent Seismometers GPS Stations Borehole Strainmeters Long-baseline Laser Strainmeters

14 Wells, Nevada Earthquake EarthScope Partners

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