P-wave


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Related to P-wave: S-wave, seismic

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 ?
The team also added that the fibers can distinguish between the two types of earthquake waves, the P-wave and the S-wave.
A 12-lead electrocardiography revealed sinus rhythm with the left axis deviation of the P-wave and normal PR interval without PR segment.
We especially bring the P-wave detection (atrial activity) to a whole new level, which explains our radically better PPV, said Fleureau.
This information needs to be completed with back azimuth usually derived from P-wave polarization or S-wave polarization (Eisner et al.
Using dense array data from several hundred stations, P-wave records are typically backpropagated to the source region with a reference 1-D Earth structure.
However, due to the small scale of the fault and the appear wave impedance difference between coal seam and surrounding rock (the average density and P-wave velocity of coal seam and surrounding rock are respectively as: [rho]1=1400Kg/m3, V1=2000m/s; [rho]2=2800Kg/m3, V2=3500m/s), the obvious diffraction could be formed in the process of seismic advanced detection in coal roadway, as shown in Figure 2.
Intravascular P-wave changes are saved as the catheter approaches the SVC, helping to identify the lower 1/3 of the SVC, near the CAJ, eliminating the need for confirmatory chest X-ray or fluoroscopy in adult patients.
A 2-D coordinate system (x,y) is constructed in which the wave normal of the p-wave (in-plane longitudinal wave) and s-wave (shear wave) lie.
The P-wave velocity is determined based on a complex set of material properties, such as the mineral compositions, porosity, pore fluid characteristics, and pore structure [41-43].