Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
6th grade Earthquake
| Term | Definition |
|---|---|
| earthquakes | a vibration of the Earth’s crust produced by a rapid release of energy at a focus. |
| focus | place within the crust where an earthquake originates. |
| epicenter | the place on the Earth’s surface directly above the focus. |
| fault | a large fracture in the Earth’s crust |
| strike-slip faults (also called transform faults when associated with plate boundaries) | faults where blocks move past each other horizontally |
| dip-slip faults | faults where the movement is primarily vertical |
| magnitude | intensity of an earthquake |
| Richter scale | Measures the intensity of an earthquake. Each increase of one number (example: 5.0 to 6.0) corresponds to a tenfold increase in severity and a 30-fold increase in the amount of energy released. |
| seismograph | An instrument that measures and records details of earthquakes, such as force and duration. |
| P wave, or compressional wave | a wave that shakes the ground back and forth in the same direction and the opposite direction as the direction the wave is moving. The fastest wave. |
| S wave, or shear wave | a wave that shakes the ground back and forth perpendicular to the direction the wave is moving. The second fastest wave. |
| active fault | A fault that is likely to have another earthquake sometime in the future. Faults are commonly considered to be active if they have moved one or more times in the last 10,000 years. |
| aftershocks | earthquakes that follow the largest shock of an earthquake sequence. They are smaller and can continue over a period of weeks, months, or years |
| amplitude | the size of the wiggles on an earthquake recording |
| attenuation | waves are largest where they are formed and gradually get smaller as they move away |
| core | The innermost part of the earth. It is separated into an outer, liquid metal part and an inner, solid metal part |
| creep | Slow, more or less continuous movement occurring on faults due to ongoing tectonic deformation. Faults where this is happening do not tend to have large earthquakes. |
| crust | the outermost major layer of the earth |
| foreshocks | relatively smaller earthquakes that precede the largest earthquake in a series |
| mainshock | the largest earthquake in a sequence |
| mantle | the part of the earth's interior between the metallic outer core and the crust |
| Ring of Fire | the zone of earthquakes surrounding the Pacific Ocean- about 90% of the world's earthquakes occur there |
| tsunami | a sea wave from large-scale seafloor displacements associated with large earthquakes, major submarine slides, or exploding volcanic islands |
| Surface waves | waves that travel just under the Earth’s surface. They are typically generated when the source of the earthquake is close to the Earth’s surface. The slowest waves. |
| Seismic waves | vibrations from earthquakes that travel through the Earth |
| Tectonic plate | a piece of the Earth’s lithosphere that moves on top of the fluid part of the mantle. There are seven main plates and a number of smaller ones |
| Body Waves | seismic waves that travel through the body of the earth |
Created by:
feralresiliency
Popular Earth Science sets