plate tectonics volcanoes and earthquakes
Download
Skip this Video
Download Presentation
Plate tectonics, volcanoes, and earthquakes

Loading in 2 Seconds...

play fullscreen
1 / 25

Plate tectonics, volcanoes, and earthquakes - PowerPoint PPT Presentation


  • 158 Views
  • Uploaded on

Mr. Hajek’s 4th-grade classroom Paradise Canyon Elementary School La Canada, California 3 October 2003. Plate tectonics, volcanoes, and earthquakes. Ken Hudnut U. S. Geological Survey. Plate tectonics, volcanoes and earthquakes. Part 1 - plate tectonics Part 2 - volcanoes

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Plate tectonics, volcanoes, and earthquakes' - vidal


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
plate tectonics volcanoes and earthquakes

Mr. Hajek’s 4th-grade classroom

Paradise Canyon Elementary School

La Canada, California 3 October 2003

Plate tectonics, volcanoes,and earthquakes

Ken Hudnut

U. S. Geological Survey

plate tectonics volcanoes and earthquakes1
Plate tectonics, volcanoesand earthquakes
  • Part 1 - plate tectonics
  • Part 2 - volcanoes
  • Part 3 - earthquakes
part 1 plate tectonics
Part 1. Plate Tectonics

Movie by T. Atwater, UCSB

slide4

Motion between

the plates causes

earthquakes and

volcanoes

earthquakes and volcanoes are driven by plate tectonic motion
Earthquakes and volcanoes are driven by plate tectonic motion
  • As a plate subducted, the Cascades volcanoes and San Andreas fault were born
  • The subducting plate melts and the magma rises up to form volcanoes
  • The plates sliding past each other make the active transform faults

Movie by T. Atwater, UCSB

worksheet on plate edges
Worksheet on Plate Edges
  • Plate edges are of three types
    • Plates pull away from each other
    • Plates push towards each other
    • Plates slide past each other

color the plates!

part 2 volcanoes
Part 2. Volcanoes

Eruption of Stromboli, Italy

slide9

Motion between

the plates causes

earthquakes and

volcanoes

This is really bad news for people (like us!) living around the Pacific Rim, also known as the Ring of Fire

why do volcanoes erupt
Why do volcanoes erupt?
  • Pressure builds up because of heat and trapped gas bubbles
  • Cracks open and lava, steam and ash blast out
  • Sticky magma makes tall cone-shaped volcanoes (like Merapi)
  • Runny magma makes low, broad volcanoes (like Kilauea, Hawai’I)
merapi volcano java
Merapivolcano,Java

Strato-volcanoes

erupt igneous rocks!

westdahl volcano alaska
Westdahlvolcano,Alaska

Volcanoes inflate

with magma, and

deflate with lava

worksheet on ring of fire
Worksheet on Ring of Fire
  • Plates crash into each other, causing high mountains and low ocean floor called trenches
    • Deepest trench is the Marianas (esp. at the ‘Challenger Deep’ location shown on map)
    • Highest mountain is Mt. Everest

color the ring of fire!

slide14

What about Hawai\'i?

It\'s a \'hot spot\'

Worksheet: hot spot track - islands cool, erode, & sink

part 3 earthquakes
Part 3. Earthquakes

Earthquakes

are a global

problem

Istanbul

Tokyo

Mexico City

Jakarta

Santiago

earthquakes are driven by plate tectonic motion
Earthquakes are driven by plate tectonic motion
  • In the past 5 million years, this motion has been steady at about 2 inches per year (that’s 15 feet per century or 30 miles per million years!)
  • Yes, LA will be in San Francisco
  • No, LA will not fall into the sea

Movie by T. Atwater, UCSB

southern california is the nation s most dangerous place for earthquakes why
Southern California is the nation’s most dangerous place for earthquakes - why?

Silver linings:

State-of-the-art earthquake monitoring arrays

Many of the world’s best researchers work within this natural laboratory

san andreas fault
San Andreas fault
  • Most of the plate boundary motion
    • 1685, 1812, 1857 eq’s
  • Big Bend compression
    • 1971 Sylmar (M 6.7)
    • 1994 Northridge (M 6.7)
  • SoCal is now heavily ‘wired’ (much like Japan & Taiwan)
    • Seismic
    • GPS
slide23

‘A rip in the desert canvas’

- Los Angeles Times

Katherine Kendrick, USGS

Chris Walls, Earth Consultants International

conclusions
Conclusions:
  • Earth is a very active planet - that’s both a good and bad thing
  • Humans can survive despite natural hazards - tragic losses from volcanoes & earthquake are not inevitable
  • Natural beauty results from plate tectonics - we can study & understand the world around us
ad