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An Introduction to Paleoseismology with an emphasis on liquefaction features

Charlotte Bate Anika Bergen. An Introduction to Paleoseismology with an emphasis on liquefaction features. Study of Prehistoric Earthquakes Prehistoric: Before recorded history. Paleoseismology. SEISMOLOGY. United States & Co. Europe China/Middle East. Historical Seismic records. 150.

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An Introduction to Paleoseismology with an emphasis on liquefaction features

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  1. Charlotte Bate Anika Bergen An Introduction to Paleoseismology with an emphasis on liquefaction features

  2. Study of Prehistoric Earthquakes • Prehistoric: Before recorded history Paleoseismology SEISMOLOGY

  3. United States & Co. Europe China/Middle East Historical Seismic records 150 Wasatch Fault (Utah) 450 400 - 500 1000+ Teton Range Fault Zone (Wyoming) 100 000+

  4. EVIDENCE Classification of Paleoseismic Evidence PRIMARY SECONDARY 1 Tectonic deformation from coseismic slip Result of:-Earthquake shaking-Erosional and depositional consequences of shaking

  5. PRIMARY 2 OFF-FAULT ON-FAULT POSTSEISMIC 3 COSEISMIC COSEISMIC POSTSEISMIC

  6. EVIDENCE GEOMORPHIC -Landforms STRATIGRAPHIC -Deposits -Structures

  7. Dating Paleoearthquakes OLDER BRACKETING FEATURE YOUNGER Dating Paleoearthquakes

  8. Hazard Assessment Recurrence Patterns COMPLEX

  9. PRIMARY SECONDARY Paleoearthquake magnitude / HISTORICAL EARTHQUAKES

  10. New madrid seismic zone Pink dots represent epicenters of earthquakes since 1974. Black crosses represent large earthquakes in the area.

  11. Sand blows appear as white deposits in a variety of shapes and sizes. Sand blows in the NMSZ could be as large as 10 000 square kilometers.

  12. Layering within the dike and the sill indicate that liquefied sand travelled to the surface on multiple occasions.

  13. Archeological artifacts found in the NMSZ. Archeological artifacts and radiocarbon dating help put time constraints on the sand blows.

  14. B: Average recurrence of earthquakes in the area is 500 years.

  15. http://www.youtube.com/watch?v=ksaHZy2JHK0

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