What is a Seismograph / Earthquake measurement instrument?

A seismograph is a device developed to record the shaking of an earthquake. It is said that China already had its prototype more than 1800 years ago, and it is often introduced as the oldest seismograph in the world. It is said that the modern seismograph was invented in Japan in the early Meiji era, and various improvements have been made since then. A term similar to a seismograph is a seismic intensity meter, which is a type of seismograph. The seismic intensity meter has a function to calculate the seismic intensity in addition to the function of the seismograph, so the name is used to distinguish it from the seismograph.

Application of Seismograph / Earthquake measurement instrument

The data measured by seismographs are used for various earthquake countermeasures. Seismometers are installed all over the country, and the Japan Meteorological Agency alone has more than 600 seismographs nationwide. The Japan Meteorological Agency collects data from seismographs all over the country in real time, and when an earthquake occurs, it is used in various ways such as promptly disseminating danger in the form of an Earthquake Early Warning, disseminating information on seismic intensity and epicenter, and predicting tsunami. increase. This information will be disseminated to the national government and ministries and agencies so that the necessary support can be provided promptly. Seismometers are also used as observation equipment for volcanic activity. A seismograph is installed near the volcano to observe volcanic earthquakes and volcanic tremors.

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