Apparatus for correcting the timing function in a nodal seismic data acquisition unit

An autonomous seismic data acquisition unit comprising:

• a. a fully enclosed, self-contained case having a wall defining at least one internal compartment;
• b. at least one geophone rigidly fixed within said case, said geophone having at least one electrical connection, wherein all electrical connections for said rigidly fixed geophone are contained within said case;
• c. a sample clock disposed within said case and capable of initiating analog to digital conversion of data from the seismic sensor;
• d. a power source disposed within said case;
• e. a seismic data recorder disposed within said case;
• f. a control processor disposed within said case and on which the control process for a local time base are implemented;
• g. a wireless receiver disposed within said case and interfaced with said control processor, said receiver capable of receiving a timing signal from an external time reference and being placed in a low power state when said receiver is not in operation;
• h. an environmental sensor in communication with the control processor and capable of providing data concerning a local measured condition;
• and
• i. an adjustable timing signal device capable of producing an adjustable timing signal to the clock, wherein said adjustable timing signal device is configured to be disciplined by the control processor utilizing data from the environmental sensor;
• j. wherein the case comprises a first plate and a second plate joined together by said wall defining the internal compartment.

An autonomous seismic data acquisition unit comprising:

• a. a fully enclosed, self-contained case having a wall defining at least one internal compartment;
• b. at least one geophone rigidly fixed within said case, said geophone having at least one electrical connection, wherein all electrical connections for said rigidly fixed geophone are contained within said case;
• c. a sample clock disposed within said case and capable of initiating analog to digital conversion of data from the seismic sensor;
• d. a power source disposed within said case;
• e. a seismic data recorder disposed within said case;
• f. a control processor disposed within said case and on which the control process for a local time base are implemented;
• g. an environmental sensor in communication with the control processor and capable of providing data concerning a local measured condition;
• and
• h. an adjustable timing signal device capable of producing an adjustable timing signal to the clock, wherein said adjustable timing signal device is configured to be disciplined by the control processor utilizing data from the environmental sensor;
• i. wherein the case comprises a first plate and a second plate joined together by said wall defining the internal compartment.