Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
What is a wave length ?
|
Distance between two successive wave crests
|
|
|
At the crust/mantle boundary, how many km do both P & S waves increase in their speed? What wave moves faster, P or S ?
|
1-2 km/second. P waves move fastest
|
|
|
In the continental crust, do P waves speed up?
|
Yes, the speed up from 6km/second to 8km/second at Moho
|
|
|
In Oceanic Crust do P waves speed up?
|
Yes, speed up from 7 km/second to 8km/second at Moho
|
|
|
What are seismic discontinuities?
|
Any boundary in Earth where seismic body waves change their velocity more than .2 km/second
|
|
|
What are the two important seismic discontinuities?
|
-P & S waves speed up
- Changing mineral structures |
|
|
In the Core/Mantle boundary, what do P & S waves do?
|
- P waves slows down from 13km/second to 8 km/second
- S waves eliminated- can't go through next layer |
|
|
What is the average speed of continental crust?
|
6km/second
|
|
|
What is the average speed in oceanic crust?
|
7km/second
|
|
|
What is the average speed in the upper mantle?
|
8 km/second
|
|
|
What do absolute velocities tell us about?
|
Tell us what kind of rocks and minerals are inside
|
|
|
What is the outer/inner core boundary?
|
inner core- frozen iron
outer core- liquid iron |
