1 / 9

Alaska 1964 Earthquake Tectonic Deformation

Alaska 1964 Earthquake Tectonic Deformation. Veronica Schnitzer EPSC 330. Background Info. Occurred March 27, 1964 Prince William Sound, Alaska Magnitude 9.2 128 deaths $311 million in property loss Extreme uplift Landslides. u sgs.gov. Coseismic deformation. George Plafker , 1965

mariel
Download Presentation

Alaska 1964 Earthquake Tectonic Deformation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Alaska 1964 EarthquakeTectonic Deformation Veronica SchnitzerEPSC 330

  2. Background Info • Occurred March 27, 1964 • Prince William Sound, Alaska • Magnitude 9.2 • 128 deaths • $311 million in property loss • Extreme uplift • Landslides usgs.gov

  3. Coseismic deformation • George Plafker, 1965 • Saw uplift and subsidence visible on land • Measured change in barnacle line • Drew contour map Plafker, 1965

  4. Plafker, 1965

  5. Postseismic deformation • Savage & Plafker, 1991 • Measured postseismic uplift and subsidence pattern • Looked at change in annual mean sea levels • 5 year postseismic slip • 100 year flow in aesthenosphere Savage & Plafker, 1991

  6. Postseismic deformation • Zweck et al, 2002 • GPS, triangulation, leveling data • Created models to measure distribution of slip • Found more than one time-decaying component • Creep on fault • Viscous/viscoelastic relaxation

  7. Conclusion • The Alaska 1964 earthquake was the second most powerful ever recorded • It resulted in extreme uplift and subsidence on land • Coseismic measurements showed strong evidence for a subduction zone • Postseismic measurements showed two time components of postseismic deformation: short term postseismic slip, and long term viscous/viscoelastic flow.

  8. References • Plafker, G., 1965. Tectonic Deformation Associated with the 1964 Alaska Earthquake. American Association for the Advancement of Science 148, no. 3678, pp. 1675-1687. • Savage, J.C. & Plafker, G., 1991. Tide Gage Measurements of Uplift Alone the South Coast of Alaska. Journal of Geophysical Research 96, no. B3, pp. 4325-4335. • Stover, C.W. & Coffman, J.L., 1993. Seismicity of the United States 1568-1989(Revised). U.S. Geological Survey Professional Paper 1527. Retrieved from http://earthquake.usgs.gov/earthquakes/states/events/1964_03_28.php • Zweck, C., Freymueller, J.T. & Cohen, S.C., 2002. The 1964 great Alaska earthquake: present day and cumulative postseismic deformation in the western Kenia Peninsula. Physics of the Earth and Planetary Interiors 132, pp. 5-20.

More Related