P-wave

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Related to P-waves: Seismic waves, S-waves

P-wave

 (pē′wāv′)
n.
A seismic wave that travels very quickly through the earth, causing the rocks it passes through to change in volume and their particles to vibrate parallel to the direction of wave propagation. P-waves can travel through solids, liquids, and gases.

[P(rimary) wave, since it is the first type of wave to be detected by a seismograph after a seismic event.]
References in periodicals archive ?
This is crucial for earthquake warning system because P-waves travel faster but S-waves cause more damage.
It was characterized by narrow complex tachycardia with regular RR interval and absence of p-waves.
However, relatively strong P-wave arrivals allowed to determine back azimuths directly from the P-waves in this dataset.
D 2# Reflected channel wave, is formed by reflection of 1# reflection channel wave when encountering the tunnel face; E 3# reflected channel wave, is formed by the reflection of 2# reflection channel wave when encountering fault; F the roadway acoustic wave, is formed by the direct P-wave when propagating into the cavity of the roadway; G the diffracted P-waves at the endpoint of the tunnel face are the multiple diffractions when direct P-wave encounters the endpoint (Kamsani et al.
The P-waves of surface ECG were negative/positive in the inferior limb leads [Figure 1]a, and positive in V1.
His ECG showed discordance between p-waves and QRS-complex; atrial heart rate was 100bpm (p-waves) & ventricular rate was 26bpm (QRS-complex) [Figure 2].
It is characterized by unchanged PR intervals for conducted beats (those followed by a QRS), with intermittent sinus P-waves without conduction through to the ventricles (evidenced by the absence of a QRS complex) (Surawicz & Knilans, 2008).
The arrival-time data of p-waves from local earthquakes that occurred within the Kalabagh seismic network operated from March 1981 to September 1990 are used for inversion.
In third-degree IAB, there are longer P-waves with biphasic morphology in the inferior leads.
The current patented sensing technology; NETQUAKEGUARD detects P-waves (the non-destructive primary earthquake waves) in advance of damaging S and R waves.
In the photo-detachment process, these detached-electron p-waves originate from each coherent source and interact with one another at large distance and on the observation plane we observe interferences [8].