# What are the main functions of seismometers?

## What are the main functions of seismometers?

A seismometer is the internal part of the seismograph, which may be a pendulum or a mass mounted on a spring; however, it is often used synonymously with “seismograph”. Seismographs are instruments used to record the motion of the ground during an earthquake.

What do seismometers measure?

A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage.

### How do you make a seismometer more sensitive?

To increase sensitivity, this type of device was then mounted upside down, which is why it is known as an inverted pendulum. In this case, the pendulum’s centre of mass is above the pivot point.

What is a seismic signal?

Seismic Signals. Seismic Signals. Seismic instruments are designed to measure vibrations in the Earth. Earthquakes are just one of many things that cause these vibrations: Cars on the road. Wind blowing through trees.

#### How do seismometers detect earthquakes?

Seismometers allow us to detect and measure earthquakes by converting vibrations due to seismic waves into electrical signals, which we can then display as seismograms on a computer screen. Seismologists study earthquakes and can use this data to determine where and how big a particular earthquake is.

How do seismometers affect people’s lives?

Seismographs can detect quakes that are too small for humans to feel. During an earthquake, ground-shaking seismic waves radiate outward from the quake source, called the epicenter. Different types of seismic waves travel at different speeds and through different parts of the Earth during a quake.

## How are seismograms created?

When there is an earthquake, everything in the seismograph moves with the Earth except the weight with the pen on it. As the drum and paper shake next to the pen, the pen makes squiggly lines on the paper, creating a record of the earthquake. This record made by the seismograph is called a seismogram.

What are the three seismographs?

Remember that seismographs record three types of earthquake waves which have been described to you in class: 1) P-waves (also called push-pull or compressional waves), 2) S-waves (also called shear or shake waves), and 3) L-waves (also called long or love waves).

### What are the 3 main types of seismic waves?

There are three major kinds of seismic waves: P, S, and surface waves. P and S waves together are sometimes called body waves because they can travel through the body of the earth, and are not trapped near the surface. A P wave is a sound wave traveling through rock.