A seismometer is a device for measuring the movement of the earth. It consists of a ground motion detection sensor coupled with a recording system.

The ZM 500 is a short period vertical seismometer

"Short period" Seismometers (less than 2 seconds) are mainly used to study the volume waves (compression waves or P waves, shear waves or S waves) and the nearby and regional seismicity.

ZM 500 seismometers use a measuring system based on magnet and coil: a coil attached to the moving mass oscillates in a magnet fixed to the frame. This system allows the measurement of the speed of ground motion for frequencies above the resonant frequency of the device.

 

Introduction

Over 25 years of experience it equips the national metropolitan network for monitoring alert seismic (over 40 stations)

Reliable and robust sensors, seismometers CPHM500 are dedicated to recording seismic waves and vibrations in the band 0.1 Hz to 100 Hz. It is a very high resolution sensor (resolution of the minimum seismic noise on the surface of the earth)...

It is mainly used to study seismic waves (compression waves and shear waves) generated by nearby and regional seismicity such as earthquakes, volcanic eruption and other seismic sources.

 

Product sold under licence of  CEA

CP HM 500
 

Physical characteristics

Æ 300 mm / H 300 mm / Weight 10.5 kg
-20° to +60°
Natural frequency f0 = 1 Hz, adjustable from 0.6 to 1.4 Hz
Mechanical damping < 0.01 for f0 = 1 Hz
10 Hz noise level at input: 30 pm.s-1 / √Hz

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