# What instrument is used to predict earthquakes?

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## What four activities can trigger a tsunami?

Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.

## Can we predict an earthquake?

No. Neither the USGS nor any other scientists have ever predicted a major earthquake. We do not know how, and we do not expect to know how any time in the foreseeable future. USGS scientists can only calculate the probability that a significant earthquake will occur in a specific area within a certain number of years.

## How do you know when an earthquake is coming?

Though there is no way to pinpoint the exact arrival of an earthquake, scientists can examine sediment samples to get an idea of when major earthquakes occurred in the past. By measuring the amount of time between events, they can come up with a rough idea of when a major quake might hit.

## What was the longest earthquake?

The 1960 Valdivia earthquake (Spanish: Terremoto de Valdivia) or the Great Chilean earthquake (Gran terremoto de Chile) on 22 May 1960 was the most powerful earthquake ever recorded.

1960 Valdivia earthquake.

Iquique Santiago Punta Arenas
UTC time 1960-05-22 19:11:14
Local date 22 May 1960
Local time 15:11:14
Duration approx. 10 minutes
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## How many earthquakes happened in 2020?

This is a list of earthquakes in 2020. Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for other reasons. All dates are listed according to UTC time.

List of earthquakes in 2020.

Number by magnitude
5.0−5.9 1,315
4.0−4.9 12,216
← 2019 2021 →

## What is the atomic bomb equivalent to a 8.0 earthquake?

More examples

Approximate Richter Magnitude number Seismic energy equivalent: Amount of TNT
7.1 50 megatons
7.5 178 megatons
7.8 600 megatons
8.0 1 gigaton