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P wave and S wave from seismograph Velocity of seismic waves in Earth versus depth. [1] The negligible S-wave velocity in the outer core occurs because it is liquid, while in the solid inner core the S-wave velocity is non-zero. A seismic wave is a mechanical wave of acoustic energy that travels through the Earth or another planetary body.
[[Category:Earthquake templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Earthquake templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
[18] [19] P-waves, which can move through all states of matter and provide data on a range of depths, change speed based on the material's properties, such as type, density, and temperature. [ 3 ] [ 1 ] S-waves, in contrast, are constrained to solids and reveal information about the Earth's rigidity and internal composition, including the ...
A P wave (primary wave or pressure wave) is one of the two main types of elastic body waves, called seismic waves in seismology. P waves travel faster than other seismic waves and hence are the first signal from an earthquake to arrive at any affected location or at a seismograph. P waves may be transmitted through gases, liquids, or solids.
The P wave is the first wave that is bigger than the other waves (the microseisms). Because P waves are the fastest seismic waves, they will usually be the first ones that the seismograph records. The next set of seismic waves on the seismogram will be the S waves. These are usually bigger than the P waves, and have higher frequency.
An earthquake's seismic moment can be estimated in various ways, which are the bases of the M wb, M wr, M wc, M ww, M wp, M i, and M wpd scales, all subtypes of the generic M w scale. See Moment magnitude scale § Subtypes for details. Seismic moment is considered the most objective measure of an earthquake's "size" in regard of total energy. [50]
(cm/s 2,gal) Ground Speed (cm/s) What People Feel Effects Indoors Effects Outdoors; 0 Undetectable (無感) below 0.8 gal Imperceptible to humans 1 Slight (微震) 0.8-2.5 gal People may feel slight shaking when motionless 2 Weak (輕震) 2.5-8.0 gal Most people will feel shaking, and some sleepers may wake up
to the end of the template code, making sure it starts on the same line as the code's last character. Pages in category "Earthquakes in year templates" The following 75 pages are in this category, out of 75 total.