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The first waves to arrive at a seismograph station are primary waves, or P waves.
8 minutes
The distance between a seismic station and the earthquake epicenter is determined from the S-P interval, which is the time difference between the time of arrival of the first P wave and the first S wave.
P-waves are the first to arrive at a seismic station. There are two major types of waves: Body waves and surface waves. P-waves and S-waves come under Body waves while Love and Rayleigh waves come under surface waves. Body waves are much faster than the Surface waves. Waves are detected in the following order: P, S, Love and Rayleigh
P-waves which are a compression or pressure wave are the fastest seismic waves. As they are the fastest they will reach the seismic station before any of the other seismic waves and be recorded first. Seismologists can use the difference between the arrival times of different seismic waves to calculate the distance and ultimately the location of the earthquakes epicentre. For information on this, please see the related question.
The first waves to arrive at a seismograph station are primary waves, or P waves.
P-waves are the first seismic waves to arrive at a seismograph station.
First
8 minutes
P waves arrive first at a seismograph station after an earthquake. The P waves are followed by S waves, and then surface waves.
P
true
The distance between a seismic station and the earthquake epicenter is determined from the S-P interval, which is the time difference between the time of arrival of the first P wave and the first S wave.
The distance between a seismic station and the earthquake epicenter is determined from the S-P interval, which is the time difference between the time of arrival of the first P wave and the first S wave.
P-waves are the first to arrive at a seismic station. There are two major types of waves: Body waves and surface waves. P-waves and S-waves come under Body waves while Love and Rayleigh waves come under surface waves. Body waves are much faster than the Surface waves. Waves are detected in the following order: P, S, Love and Rayleigh
The first "modern" seismograph was invented by John Milne in 1880. However, Zhang Heng, a Chinese astronomer is also believed to have invented the seismograph; probably the primitive ones.
P Wave