## What is the point underground where rock layers first move during an earthquake?

**The focus** is the point underground where rock layers first move during an earthquake.

## Where does the first movement occur in an earthquake?

The point on a fault at which the first movement or break occurs during an earthquake is called the **earthquakes hypocenter (focus)** (figure 1).

## What is the underground point where an earthquake begins quizlet?

The underground point where an earthquake begins is **the epicenter**. The most active zone for earthquakes is the Alpide belt.

## What is the epicenter of an earthquake?

The epicenter is **the point on the earth's surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins**.

## What does P and S waves stand for?

Compressional waves are also called P-Waves, (P stands for "primary") because they are always the first to arrive. They gave us the first jolt last Friday. Shear waves propagate more slowly through the Earth than compressional waves and arrive second, hence their name S- or secondary waves.

## What is the point of origin of an earthquake below the surface of the earth?

The location below the earth's surface where the earthquake starts is called **the hypocenter**, and the location directly above it on the surface of the earth is called the epicenter.

## What point along the fault where movement first occurs?

**The epicenter** is the point on Earth's surface above an earthquake's starting point, or focus. The location within Earth along a fault at which the first motion of an earthquake occurs.

## What is the area on Earth’s surface directly above the point where the rock layer breaks?

The point at the Earth's surface directly above the focus is called **the epicenter of the earthquake**. At the epicenter, the strongest shaking occurs during an earthquake. Sometimes the ground surface breaks along the fault.

## Which of the following arrive first at a location distant from the earthquake?

The first waves to arrive are the **P-waves** (also called "primary" or "push-pull"). They are followed by the S-waves (also called "secondary," "shear," or "shake"). Finally, the L-waves ("long" or "Love") arrive. This investigation contains the seismograms from three different stations for an earthquake.

## What is the location on the Earth’s surface directly above the point where an earthquake begins quizlet?

The focus is the point within Earth where an earthquake starts. **The epicenter** is the location on the surface directly above the focus.

## What is focus and epicenter?

**The focus is the place inside Earth's crust where an earthquake originates.** **The point on the Earth's surface directly above the focus is the epicenter**. When energy is released at the focus, seismic waves travel outward from that point in all directions.

## Where are earthquake epicenters located?

The epicenter is located **on the surface directly above the focus (hypocenter), which is located on the fault at depth**. The latitude and longitude will be the same for the epicenter and hypocenter of the same event.

## What are P and S waves in earthquakes?

In P or compressional waves, the vibration of the rock is in the direction of propagation. P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation.

## What is P wave in earthquake?

A P wave, or compressional wave, is **a seismic body wave that shakes the ground back and forth in the same direction and the opposite direction as the direction the wave is moving**.

## What is the exact point above the point of origin where an earthquake is felt the strongest?

The focus is point inside the earth where the earthquake started, sometimes called the hypocenter, and the point on the surface of the earth directly above the focus is called **the epicenter**.

## What is the exact point above the point of origin?

**The epicenter, epicentre or epicentrum** is the point on the Earth's surface that is directly above the hypocenter or focus, the point where an earthquake or underground explosion originates.

## Which of the following is the correct location of earthquake epicenter and focus?

This is an earthquake. The focus is the place inside Earth's crust where an earthquake originates. **The point on the Earth's surface directly above the focus is the epicenter.**

## What is the point or place that is the first to record the seismic waves?

hypocenter The point within the earth along the rupturing geological fault where an earthquake originates is called the **focus, or hypocenter**.

## What is the point on the earth’s surface where an earthquake is felt the most?

The location where an earthquake begins is called **the epicenter**. An earthquake's most intense shaking is often felt near the epicenter.

## In what order do earthquake waves arrive at seismic stations?

**P waves travel the fastest, so they arrive first.** **S waves, which travel at about half the speed of P waves, arrive later**. A seismic station close to the earthquake records P waves and S waves in quick succession.

## What is the point on the surface directly above the focus?

The point on the Earth's surface directly above the focus is called **the epicenter of the earthquake**.

## What is another word for epicenter?

What is another word for epicenter?

core |
heart |
---|---|

focal point |
middle |

kernel |
headquarters |

nub |
foundation |

pivot |
place |

## What is the point on the surface nearest the earthquake?

The hypocenter is the point within the earth where an earthquake rupture starts. **The epicenter** is the point directly above it at the surface of the Earth. Also commonly termed the focus.

## Do P waves or S waves come first?

**P waves travel fastest and are the first to arrive from the earthquake**. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.

## Why do P waves come first?

P and S waves can be used to locate the epicenter of an earthquake. **Since P waves are faster than S waves**, the larger the arrival time difference between the two waves is, the farther that location is from the epicenter.

## What do P waves and S waves stand for?

Primary (P) and secondary (S) waves are two types of waves caused by earthquakes. They are defined based on when they arrive and are felt on the surface. **P waves, or primary waves, arrive first while S waves, or secondary waves, arrive second**. Both waves cause the ground to shake when an earthquake occurs.

## What are P waves S waves and surface waves?

S waves are called secondary waves because they always arrive after P waves at seismic recording stations. Unlike P waves, S waves can travel only through solid materials. **After both P and S waves have moved through the body of Earth, they are followed by surface waves, which travel along Earth's surface**.

## What is the exact point above the point of origin where an earthquake is felt the strongest a focus b crater C fissure D epicenter?

The point on the Earth's surface directly above the focus is **the epicenter**. When energy is released at the focus, seismic waves travel outward from that point in all directions. There are different types of seismic waves, each one traveling at varying speeds and motions.

## What do you call the point along the fault where movement first occur?

The rupture begins at a point on the fault plane called **the hypocenter**, a point usually deep down on the fault. The epicenter is the point on the surface directly above the hypocenter.

## Which type of seismic wave arrives first at a seismograph?

**P-waves** are pressure waves that travel faster than other waves through the earth to arrive at seismograph stations first, hence the name "Primary". These waves can travel through any type of material, including fluids, and can travel nearly 1.7 times faster than the S-waves.