Shielding of a Seismic Sensor from Nearby Area Interferences

Seismic monitoring is often required in the construction and operation of large industrial sites and their associated infrastructure. For this purpose, seismic sensors are most often used for the detection of horizontal seismic oscillations caused by relatively distant sources. At the same time, sources located in close proximity to the sensor can create parasitic vertical seismic waves which considerably exceed the sensitivity of the sensor. Thus, they cause an increase in false alarms and reduce the probability of correctly detecting horizontal seismic oscillations by the sensors.The purpose of this article is to create and explore the effectiveness of a device which shields the sensor from vertical seismic mechanical disturbances occurring in the nearby area. The device is based on the attenuation and dispersion of mechanical waves passing through a sequence of media with different mechanical impedances.