Science Lesson 2: Collide, Move Apart, and Slide and Triangulation Method Flashcards
(23 cards)
He proposed the continental drift theory.
Alfred Wegener
It is also known as plate margins
Plate Boundaries
Used to determine the epicenter by where it intersects
Triangulation Method
Two continental crustal plates move toward one another
Continental-Continental
Move apart from each other, outwards, tensional force
Divergent Plate Boundaries
Uses seismic data collected from at least 3 different locations
Triangulation Method
Causes one plate to subduct from the other
Oceanic-Oceanic
Slide past horizontally, lateral, shearing force
Transform Plate Boundaries
The point on the Earth’s surface vertically above the focus of an earthquake
Epicenter
Produces new seafloor
Divergent Plate Boundaries
Print out/display screen
Seismogram
Relating to an earthquake vibration
Seismic
Process at which oceanic crust sinks down the continental crust and goes back to the mantle
Subduction
It is a line where large moving plates meet
Plate Boundaries
Deep, narrow depression on the ocean seafloor caused by the collision and/or subduction of plates
Trench
A depression or lowland region along the separation of plates
Rift valley
Move towards each other, inwards, compressing force
Convergent Plate Boundaries
Father of the plate tectonics theory
Alfred Wegener
The denser oceanic crust move beneath the lighter continental crust
Oceanic-Continental
Device that detects/measures seismic activity
Seismograph
3 types of Plate Boundaries:
Divergent, Convergent and Transform Boundaries
Time interval between the arrival of P-wave and S-wave
Lag Time
Steps in Locating the Epicenter Using Triangulation Method
- Obtain data from 3 seismic stations
- Subtract arrival time of P and S wave.
- Compute for the distance of the epicenter from each seismic station.
(Time difference x 100/8) - Draw a circle around each seismic station using the distance as its radius.
- The intersection part of the 3 circles is the earthquake’s epicenter.
