how do all these boundaries work together? pacific northwest and southwest british columbia
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HOW DO ALL THESE BOUNDARIES WORK TOGETHER? PACIFIC NORTHWEST AND SOUTHWEST BRITISH COLUMBIA. HOW DO ALL THESE BOUNDARIES WORK TOGETHER? PACIFIC NORTHWEST AND SOUTHWEST BRITISH COLUMBIA. North American Plate Movement. HOW DO ALL THESE BOUNDARIES WORK TOGETHER? - PowerPoint PPT PresentationTRANSCRIPT
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
North American Plate Movement
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
Pacific Plate MovementAnd Mendicino Fault (SanAndreas extension)
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
SMALL “MID-OCEAN”RIDGES DIVERGENT
GORDA RIDGE
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
SMALL “MID-OCEAN”RIDGES DIVERGENT
JUAN DE FUCA RIDGE
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
SMALL “MID-OCEAN”RIDGES DIVERGENT
EXPLORER RIDGE
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
SEAFLOOR SPREADING ANDTRANSFORM FAULT
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
SEAFLOOR SPREADING ANDTRANSFORM FAULT
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
SEAFLOOR SPREADING ANDTRANSFORM FAULT
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HOW DO ALL THESEBOUNDARIES WORK TOGETHER?PACIFIC NORTHWEST ANDSOUTHWEST BRITISH COLUMBIA
North American Plate (black and white) CONVERGING (white dashes) with Juan de Fuca Plate (blue and yellow).
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Can You See it on Google Earth?
1. Divergent boundaries
2. Convergent boundary
3. Transform faults4. Juan de Fuca
Plate and direction
5. Pacific Plate and direction
6. North American Plate and direction
7. Zones of Active Volcanicity
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And a Hotspot!
Coas
tal U
plift
Puge
t-Will
amett
e Lo
wla
nds
Activ
e Vo
laca
nos
Currently Active
Oldest Lavas
NorthAmericaPlate
J.D.FPacificPlate
PacificPlate
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PACIFIC NORTHWESTCASCADEMOUNTAI
N
CASCADE MOUNTAINS
PUGET- WILLAMETTE
LOWLANDS
OLYMPIC MOUNTAINS
COAST RANGE
NORTH AMERICAN PLATE
JUAN DE FUCA PLATE
PACIFICOCEAN
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NORTH AMERICAN PLATE
JUAN DE FUCA PLATE
PLATES LOCKIN PLACE
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BETWEEN EARTHQUAKES
NORTH AMERICAN PLATE
JUAN DE FUCA PLATE
CONVERGENCE CAUSESUPWARD BUCKLING OF
COASTAL AREAS
Energy stored as in a bent cane.
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DURING ERTHQUAKES
NORTH AMERICAN PLATE
JUAN DE FUCA PLATE
PLATES UNLOCK
Energy in earthquakeand tsunami
Coastlinesubsides
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BETWEEN EARTHQUAKES
NORTH AMERICAN PLATE
JUAN DE FUCA PLATE
Plates lock back togetherAfter release of energy by
earthquake
Coastline slowlyRe-emerges.
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Source: Rhodes, Tuttle, Horton, Doner, Kelsey, Nelson and Cisternas, EOS, 87, May 2006.
Tsunami Deposits, SouthernChile. Dark bands are organicsoils, lighter greys are marinesands deposited by tsunamis.
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TSUNAMI MARCH 2011
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Displacement duringEarthquake March 2011.
Source: Simons et al., 2011 Science Express
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PUEGET SOUND
3,500BPTidal Marsh
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PUEGET SOUND
3,300BPEarthquake
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PUEGET SOUND
3,200 BPEmergence
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PUEGET SOUND
3,000 BPForestedUpland
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PUEGET SOUND
3,000 BPEarthquakeSubmersion
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PUEGET SOUND
2,700 BPEarthquakeSubmergence
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PUEGET SOUND
400EmergenceForest
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PUEGET SOUND
400EarthquakeSubmersion
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PUEGET SOUND
700Emergence
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PUEGET SOUND
700EarthquakeSubmersion
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PUEGET SOUND
900Emergence
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PUEGET SOUND
900Earthquake
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PUEGET SOUND
1700EmergenceForestedUplands
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PUEGET SOUND
1700EarthquakeSubmersion
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Simulation of 1700 Earthquake and Tsunami
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PUEGET SOUND
2000Emergence
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PUEGET SOUND
AVERAGE LENGTH OF TIME BETWEEN EARTHQUAKES 300 yrs
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PUEGET SOUND
AVERAGE LENGTH OF TIME BETWEEN EARTHQUAKES 300 yrs
1700 ?
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SUBSTUTUTE DEPTH FOR TIMETIME
TIM
E
DEPT
H
1700
1700
900700 900700
3300BP 3000BP
3300BP
3000BP
Present
Geologists’ Principle of Superposition