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About earthquake |
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Experience report |
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About earthquake
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What is earthquake?
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P-waves and S-waves
ＨＯＭＥ ＞ About earthquake ＞ What is earthquake?
＞ P-waves and S-waves >> Observation of earthquake
＜Relation menu＞
| P-waves and S-waves |
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Two types of wave travel through the underground from the hypocenter when the earthquake occurs. The P-waves are longitudinal waves and the S-waves are transverse waves. The quakes by the P-waves is called as the preliminary tremors and we feel them first. After them, the principal shock by the S-waves occurs. |
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The time lag of these waves becomes bigger at the place far from the hypocenter.
We use this property of the waves to the “ Earthquake Early Warning ”.
By the way, the term P-waves is derived from the Latin word: primae, meaning primary, and the S-waves from the Latin word: secundae, meaning secondary.
We use this property of the waves to the “ Earthquake Early Warning ”.
By the way, the term P-waves is derived from the Latin word: primae, meaning primary, and the S-waves from the Latin word: secundae, meaning secondary.
ＨＯＭＥ ＞ About earthquake ＞ What is earthquake?
＞ P-waves and S-waves >> Observation of earthquake
＜Relation menu＞
