Sensor assembly having a seismic sensor, pressure sensor, and processor to apply first and second digital filters

A system comprising:

• a communications medium;
• a plurality of sensor assemblies communicatively coupled to the communications medium, wherein at least one of the plurality of sensor assemblies comprises:
• a housing structure;
• a seismic sensor in the housing structure to measure seismic waves propagated through a subterranean structure;
• a pressure sensor in the housing structure;
• and
• a processor in the housing structure configured to:
• receive signals based on corresponding outputs of the seismic sensor and pressure sensor;
• apply digital filters to respective ones of the signals;
• wherein application of the digital filters is to cause production of a substantially zero output by the processor in response to input that includes just noise data detected at the seismic sensor and the pressure sensor.

A method comprising:

• deploying a plurality of sensor assemblies communicatively coupled to a communications medium, wherein at least one of the plurality of sensor assemblies comprises:
• a housing structure;
• a seismic sensor in the housing structure to measure seismic waves propagated through a subterranean structure;
• a pressure sensor in the housing structure;
• and
• a processor in the housing structure configured to:
• receive signals based on corresponding outputs of the seismic sensor and pressure sensor;
• apply digital filters to respective ones of the signals;
• wherein application of the digital filters is to cause production of a substantially zero output by the processor in response to input that includes just noise data detected at the seismic sensor and the pressure sensor;
• and
• receiving, at a controller over the communications medium, an output signal that is based on the application of the digital filters to the signals.