What is the frequency range of seismometers for microearthquake monitoring in an around a nuclear power plant like structure? Which is better: short period seismometer/broadband seismometer/ 1 or 2 Hz Geophone?
According to pubs.geoscienceworld.org, the frequency range of seismometers for microearthquake monitoring can vary depending on the specific type of seismometer used. For example, the GS-13 seismometer has a calculated range of frequencies from 0.078 to 56.1 Hz, the L-4C from 0.113 to 7.2 Hz, and the L-22D from 0.175 to 0.6 Hz for which their signal-to-noise ratio (SNR) exceeds 3 dB. These ranges are determined based on each seismometer's specific design and sensitivity. It’s important to note that the choice of seismometer and its frequency range should be suitable for the specific monitoring requirements of the nuclear power plant.
Jorge Morales Pedraza Thanks Jorge for your reply. I have to monitor the seismicity in and around 50 Km of the nuclear power plant. I it better to elect broadband or short period seismometer or 2 Hz Geophone? Kindly advise.
According to nanometrics.ca and vtechworks.lib.edu, the choice between a broadband seismometer, a short-period seismometer, and a 2 Hz geophone depends on the specific requirements of your monitoring project.
Broadband Seismometers are very versatile instruments that can detect a wide range of frequencies. They are excellent for recording seismic activity but can be less effective above ~0.1 Hz due to cost and deployment effort. Broadband seismometers can record down to 240 seconds (4.2 mHz), making them suitable for detecting long-period seismic waves.
Short-period Seismometers are designed to record higher-frequency seismic waves. They are often used in networks designed to monitor local or regional seismic activity4.
2 Hz Geophones are inexpensive and can be rapidly deployed in large numbers. They record effectively above ~2 Hz, but the signal quality is limited below 2 Hz. Geophones are often used in exploration seismology where higher frequencies are of interest.
In conclusion, the choice of instrument depends on the specific needs of your project, including the types of seismic waves you wish to monitor, your budget, and the scale of your monitoring network.
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