Tectonic Mechanisms Earthquakesbrownk/ES104/ES104.2007.1030... · 2007. 10. 29. · Portland 2006...
Transcript of Tectonic Mechanisms Earthquakesbrownk/ES104/ES104.2007.1030... · 2007. 10. 29. · Portland 2006...
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Tectonic MechanismsEarthquakes
ReadingChapter 8: 241-245Chapter 7: 187-196
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Lithospheric Plates
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Earthquake Locations
• http://earth.geol.ksu.edu/sgao/g100/plots/0916_global_seismicity.jpg
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Transverse Wave
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http://astro.uchicago.edu/cara/outreach/se/ysi/1999/intro2.html
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http://astro.uchicago.edu/cara/outreach/se/ysi/1999/intro2.html
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Earthquake: seismic waves
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World Series Earthquake apartment building
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Portland 2006 November 5Magnitude 2.6
Time Monday November 6, 2006 at 05:34:35.69 Z (UTC) Sunday November 5, 2006 at 09:34:35.69 PM (PST)
Distance from
3.1 km SW of Portland, OR 28.3 km N of Canby, OR 34.9 km NE of Newberg, OR
Coordinates 45.516 deg N122.648 deg W
Depth 16 kmQuality good (BA)
http://www.ess.washington.edu/SEIS/EQ_Special/WEBDIR_06110605343c/welcome.html
Name of Event File: 06110605343c
Earthquake ReportMagnitude 2.6, SW of Portland, OR Sunday November 5, 2006 at 09:34:35.69 PM (PST)
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Portland 2006 November 6 seismograph
http://www.pnsn.org/WEBICORDER/PNSN/MCW_SHZ_UW.2006110600.html
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Seattle, WA
• Feb 28, 2001, Nisqually quake rocked the Central Puget Sound region
• 6.2 Richter Magnitude • 6.8 Moment magnitude• Centered 57.5 km south-southwest of
Seattle and 52.4 km deep
http://128.205.131.100:591/archives/Seattle.html
http://www.scec.org/earthquakes/
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1906 San Francisco fire
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Focus, epicenter, fault
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Orange grove offset, So Cal
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Before deformation
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Strain
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Release of strain
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After strain released
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Summary of elastic rebound
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San Andreas Fault System
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Seismograph
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Seismogram showing seismic waves
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P-waves
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P-waves
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S-waves
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S-waves
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S-type surface waves
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Ocean-type surface waves
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Summary of seismic waves
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Seismic wave travel time curves
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Difference of P and S wave travel time
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Mercalli scale
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Richter magnitude determined by seismic wave recording on a
seismogram
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Earthquake magnitudes and expected worldwide occurrence