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# How does a seismograph help predict earthquakes?

## How does a seismograph help predict earthquakes?

A seismograph produces a graph-like representation of the seismic waves it receives and records them onto a seismogram (Figure below). Seismograms contain information that can be used to determine how strong an earthquake was, how long it lasted, and how far away it was.

### What 2 things can we learn about an earthquake by studying the seismogram?

By studying the seismogram, the seismologist can tell how far away the earthquake was and how strong it was. This record doesn’t tell the seismologist exactly where the epicenter was, just that the earthquake happened so many miles or kilometers away from that seismograph.

#### How does a seismogram Show earthquake waves?

The pen is stationary, but when seismic waves cause a simple seismograph drum to vibrate, it causes the pen to record the drums vibrations. A seismogram shows earthquake waves by the lines on the paper. The bigger the line, the larger the earthquake and the smaller the line, the smaller the earthquake.

Why is the seismograph so important?

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. These measurements allow scientists to estimate the distance, direction, magnitude, and the type of earthquake that just occurred.

What is the purpose of a seismograph during an earthquake?

Seismographs are instruments used to record the motion of the ground during an earthquake. They are installed in the ground throughout the world and operated as part of a seismographic network.

## What’s the difference between a seismograph and a pendulum?

Seismometers, seismographs, seismograms – what’s the difference? How do they work? 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.

### Who was the first person to invent the seismograph?

The earliest “seismoscope” was invented by the Chinese philosopher Chang Heng in A.D. 132. This did not, however, record earthquakes; it only indicated that an earthquake was occurring. The first seismograph was developed in 1890.

#### What is the difference between a seismogram and a ground shaker?

In reality, these mechanisms are no longer manual, but instead work by measuring electronic changes produced by the motion of the ground with respect to the mass. A seismogram is the recording of the ground shaking at the specific location of the instrument.