tectonic mechanisms earthquakesbrownk/es104/es104.2007.1030... · 2007. 10. 29. · portland 2006...
TRANSCRIPT
Tectonic MechanismsEarthquakes
ReadingChapter 8: 241-245Chapter 7: 187-196
Lithospheric Plates
Earthquake Locations
• http://earth.geol.ksu.edu/sgao/g100/plots/0916_global_seismicity.jpg
Transverse Wave
http://astro.uchicago.edu/cara/outreach/se/ysi/1999/intro2.html
http://astro.uchicago.edu/cara/outreach/se/ysi/1999/intro2.html
Earthquake: seismic waves
World Series Earthquake apartment building
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)
Portland 2006 November 6 seismograph
http://www.pnsn.org/WEBICORDER/PNSN/MCW_SHZ_UW.2006110600.html
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/
1906 San Francisco fire
Focus, epicenter, fault
Orange grove offset, So Cal
Before deformation
Strain
Release of strain
After strain released
Summary of elastic rebound
San Andreas Fault System
Seismograph
Seismogram showing seismic waves
P-waves
P-waves
S-waves
S-waves
S-type surface waves
Ocean-type surface waves
Summary of seismic waves
Seismic wave travel time curves
Difference of P and S wave travel time
Mercalli scale
Richter magnitude determined by seismic wave recording on a
seismogram
Earthquake magnitudes and expected worldwide occurrence