# What do seismologists use to detect earthquakes

This was also the largest recorded Japanese earthquake of all time.

The depth was about 6 km and the origin time was about 10 seconds. Seismographs at the U. A predecessor event in 1934 ruptured an even greater area, yielding a higher magnitude quake.

These low-magnitude events can be triggered by small changes in stress on the fault. Richter studied records from many earthquakes in southern California, and realized that some earthquakes made very small waves whereas others produced large waves. There are two ways in which scientists quantify the size of earthquakes: Annual Edith Mary Gayton Lecture: This decrease in intensity with distance is known as attenuation.

## Earthquakes: seismology & measurement

Note that the earthquake arrives first on station C, so C is a good first guess for the location. What Does a Physiologist Do? The links here are to various sources with information on how to build a seismometer.

How to locate an epicenter

What is a Geoid? The following terms apply to hazards in general, including fire, flood, cyclones, and earthquakes.

The primary goal of U. From diet to disease: So I hope Jaxon can edit his question to "What are good learning resources to find the epicenter and focus of an earthquake? Magnitude scales, like the moment magnitude , measure the size of the earthquake at its source. The seismograms they record show the ground moving up and down and side-to-side systematically as the waves travel past the sensor. Why do we use it and where does its shape come from?

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## Why Monitor Earthquakes?

The system of linear equations is solved by the method of least squares which minimizes the sum of the squares of the differences between the observed and calculated arrival times.

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When actual damage information is obtained, this will control the emergency response.