Post on 17-Jun-2020
Brian DiBartolo M.S. Geography & Geosciences
• Board of Directors, Gastonia Sister Cities.
• Lived in the following overseas locations (all non-military): – Schroebenhousen, West Germany:
1987 – Da Nang, Vietnam: 1998 – Sicily, Italy: 1999 – La Antigua, Guatemala: 2006 – Baja California Sur, Mexico: 2013
• Have my passport stamped from eleven countries
• Followed the USMNT in Brazil for the 2014 World Cup
• Have visited or seen about 25 volcanoes, including 4 active.
Brian DiBartolo M.S. Geography & Geosciences
• I am a father of 3 school-aged children. – Alessandro, 3rd Grade – Nick, 2nd Grade – Emma Rosalie, Kindergarten
• My wife is an instructor in Anthropology, Archaeology, and also Sociology online at various colleges in North and South Carolina. Both my parents were also teachers.
Mrs. Di and two Peruvian girls with Mt. Misti in the background, south of Arequipa, Peru, 2003
Brian DiBartolo M.S. Geography & Geosciences
• James Madison University Duke (Geography and History)
• University of Tennessee Volunteer (Geography)
• Mississippi State University - Teachers in Geosciences (Geology)
• I took two cross-country trips in my life. – The 1st was a 10,000 mile, 8-week
excursion when I was in high school with my family in which we visited numerous National Parks/Monuments - many pertaining to geology.
– The 2nd was a trip from San Diego to Knoxville solo on my GS850 motorcycle in which I visited many other National Parks/Monuments pertaining to geology.
Acquiring Data “Lava Fishing”
Figure 1.8b
Figure 1.2
Plate Tectonics
Expected Outcomes
• How plates move
• What causes them to move
• What are the results of the movement
• What are the different types of movements
• How do the movement of plates relate to unbalanced forces
• Very large crustal slabs ride along the outside of the silly-putty type substance called the Asthenosphere
• Lithosphere (outer rigid shell) – Consists of several plates
• Plates are moving slowly • Largest plate is the Pacific plate • Plates are mostly beneath the ocean
• Asthenosphere – Exists beneath the lithosphere – Hotter and weaker than lithosphere – Allows for motion of lithosphere
How plates move?
Earth’s Internal Structure
Earth’s Internal Structure
• Four main layers of Earth are based on physical properties and hence mechanical strength – Lithosphere – Asthenosphere – Outer Core – Inner Core
Earth = Peach
https://dreamtigers.files.wordpress.com/2011/05/earth_layers_final_21.jpg
• Driving mechanism of plate tectonics
– No one model explains all facets of plate tectonics
– Earth’s heat is the driving force
• Radioactive decay drives the heat in the core
• Cooling off from the formation of the Earth still provides the heat
– Several models have been proposed
• Slab-pull and slab-push model – Descending oceanic crust pulls the plate
– Elevated ridge system pushes the plate
What causes tectonic plates to move?
Mechanisms Contributing to Plate Motion
What Drives Plate Motion
• Several models have been proposed
– Plate-mantle convection
• Mantle plumes extend from mantle-core boundary and cause convection within the mantle
• Models – Whole-mantle convection
– “Layer Cake” Model
https://dreamtigers.files.wordpress.com/2011/05/convection_currents_2final.jpg
Whole-Mantle Convection
Theory of Plate Tectonics
What are the different types of movements
• Plate boundaries
– All major interactions among plates occur along their boundaries
– Types of plate boundaries
• Divergent plate boundaries (constructive margins)
• Convergent plate boundaries (destructive margins)
• Transform fault boundaries (conservative margins)
The Lithospheric Plate Boundaries: Tectonic Plates Compared to a Cracked Egg Shell
https://dreamtigers.files.wordpress.com/2011/05/tectonic_plates_1_final.jpg
What are the different types of movements
Divergent Boundaries
The Divergent Plate Boundary
https://dreamtigers.files.wordpress.com/2011/05/divergent_boundary_draft.jpg
The East African rift A divergent boundary on land
Figure 16.19
Divergent Boundaries
The East African rift – a
divergent boundary on land. Afar Depression, Ethiopia
An Oceanic-Continental Convergent Plate Boundary
The Collision of Continetal and Oceanic Plates
https://dreamtigers.files.wordpress.com/2011/05/subduction_final3.jpg
The Collision of two Continetal Plates
https://dreamtigers.files.wordpress.com/2011/05/mountain_final.jpg;
A Continental-Continental Convergent Plate Boundary
• Geologic Evidence for Plate Motion – By knowing the age of the seafloor and the distance
from the spreading center, an average rate of plate motion can be calculated
Directions and Rates of Plate Motions
Plate Tectonics
What are the results of the movement
• All major tectonics interactions among plates occur along their boundaries – Seismic Events (Earthquakes & Tsunamis)
– Volcanism
– Mountain Building
– Submarine Trenches
– Mid-Ocean Ridges & Rift Valleys
– Atmospheric and Oceanic changes in global currents
03.02.a1
Observe the pattern of earthquakes (yellow dots)
Mid-ocean ridges EQ in belts
Trenches Sparse in some regions
Southern Eurasia
Mountain belts
03.02.b1
Observe the pattern of volcanoes (orange triangles)
Mid-ocean ridges (not all shown) Belts
Mountain belts next to trenches
Sparse in some regions
Island arcs next to trenches
Oceanic islands
Red Sea and East Africa
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
03.02.b2
Observe the pattern of elevations (brown = high)
Southern Eurasia high
Mountains in belts
Some belts next to trenches
Oceans vs. continents
East Africa high
Most of continents gentle and low
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
03.03.a1
Compare the distribution of earthquakes (yellow), volcanoes (orange), and high elevations (brown)
EQ, volcanism, or mtn. building = tectonic activity
Belts of tectonic activity divide lithosphere into tectonic plates
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Plate tectonics: A modern version of an old idea
• Plate boundaries – All major interactions among individual plates
occur along their boundaries
– Types of plate boundaries
1. Divergent plate boundaries (constructive margins)
2. Convergent plate boundaries (destructive margins)
3. Transform fault boundaries (conservative margins)
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
03.03.c1
Observe the locations of different types of plate boundaries
Compare these locations with mid-ocean ridges, oceanic trenches, mountains belts, line of islands, etc.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.