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A sensor assembly having improved characteristics for use in surveying a subterranean structure includes a divergence sensor for positioning at or below a ground surface, where the divergence sensor includes a container containing a material and a pressure sensor immersed in the material. In additio

A sensor assembly having improved characteristics for use in surveying a subterranean structure includes a divergence sensor for positioning at or below a ground surface, where the divergence sensor includes a container containing a material and a pressure sensor immersed in the material. In addition, the sensor assembly includes a single-component seismic sensor that is external to the container of the divergence sensor.

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1. A sensor assembly for use in surveying a subterranean structure, comprising: a housing containing: a divergence sensor for positioning at or below a ground surface above the subterranean structure, wherein the divergence sensor includes a container containing a material and a pressure sensor imme

1. A sensor assembly for use in surveying a subterranean structure, comprising: a housing containing: a divergence sensor for positioning at or below a ground surface above the subterranean structure, wherein the divergence sensor includes a container containing a material and a pressure sensor immersed in the material; anda single-component seismic sensor external to the container of the divergence sensor, the seismic sensor positioned inside the housing above the divergence sensor when the sensor assembly is implanted into the ground surface. 2. The sensor assembly of claim 1, wherein the seismic sensor comprises one of a geophone and an accelerometer. 3. The sensor assembly of claim 1, wherein the seismic sensor is to measure a vertical component of particle velocity or acceleration or displacement of a seismic wavefield. 4. The sensor assembly of claim 1, wherein an output produced from data of the seismic sensor includes one of: a measured horizontal component of particle velocity or acceleration or displacement of a seismic wavefield; and a derived horizontal component of particle velocity or acceleration or displacement of the seismic wavefield. 5. The sensor assembly of claim 1, wherein the container contains an expansion volume filled with gas or vacuum, wherein the expansion volume is adjacent the material inside the container. 6. The sensor assembly of claim 5, further comprising a bubble structure coupled to the container to provide the expansion volume filled with gas or vacuum. 7. The sensor assembly of claim 5, wherein the container is partially filled with the material to provide the expansion volume. 8. The sensor assembly of claim 1, wherein the material includes liquid. 9. The sensor assembly of claim 8, wherein the liquid is selected from the group consisting of kerosene, mineral oil, vegetable oil, silicone oil, and water. 10. The sensor assembly of claim 1, wherein the material includes a gel. 11. The sensor assembly of claim 1, wherein the material includes a solid. 12. The sensor assembly of claim 11, wherein the solid is selected from the group consisting of sand and a plastic. 13. The sensor assembly of claim 1, wherein the container has a shape selected from the group consisting of: a cuboid shape, a parallelepiped shape, a pyramid shape, a quadrilateral frustum shape, and a dipyramid shape. 14. The sensor assembly of claim 1, wherein the container is generally ellipsoid shaped or spherically shaped. 15. The sensor assembly of claim 1, further comprising a soft pin attached to a bottom portion of the container. 16. The sensor assembly of claim 1, wherein the pressure sensor comprises a hydrophone. 17. The sensor assembly of claim 1, wherein the divergence sensor is positioned to enable measurement of ground-roll noise. 18. The sensor assembly of claim 1, wherein the container has a side portion having a larger stiffness than a stiffness of a top portion and a stiffness of a bottom portion of the container, to cause greater directional sensitivity of the divergence sensor to a wavefield propagating in a direction that is generally perpendicular to the side portion. 19. The sensor assembly of claim 18, wherein the side portion is formed of a different material than each of the top portion and the bottom portion of the container to provide the larger stiffness. 20. The sensor assembly of claim 18, wherein the side portion is formed of a different thickness than each of the top portion and the bottom portion of the container to provide the larger stiffness. 21. The sensor assembly of claim 1, further comprising electronic circuitry electrically connected to the seismic sensor and the divergence sensor, the electronic circuitry including a communication component to communicate with a controller, the electronic circuitry positioned above the seismic sensor when the sensor assembly is implanted into the ground surface. 22. A method of performing seismic surveying comprising: deploying sensor assemblies on a ground surface, wherein each of at least some of the sensor assemblies has a housing containing a seismic sensor and a divergence sensor, wherein the divergence sensor has a container containing a material and a pressure sensor immersed in the material, and wherein the seismic sensor is located above and external to the container of the divergence sensor;measuring waves by the seismic sensors and divergence sensors, where the divergence sensors are to measure ground-roll noise and wherein data from the divergence sensors is for use to attenuate the ground-roll noise in data acquired by the seismic sensors. 23. The method of claim 22, wherein the waves measured by the divergence sensors comprise waves traveling generally horizontally. 24. The method of claim 22, wherein each of the containers is partially filled with the material to provide an expansion volume for the material. 25. The method of claim 22, further comprising arranging different sides of at least a particular one of the containers to have different stiffness, wherein a side portion of the particular container has a stiffness larger than a stiffness of a top portion and a stiffness of a bottom portion of the particular container, to cause greater directional sensitivity of the corresponding divergence sensor to a wavefield propagating in a horizontal direction that is generally perpendicular to the side portion. 26. The method of claim 22, wherein each of the at least some of the sensor assemblies further comprises electronic circuitry electrically connected to the seismic sensor and the divergence sensor, the electronic circuitry positioned above the seismic sensor when the respective sensor assembly is implanted into the ground surface, the method further comprising: communicating between a communication component of the electronic circuitry of each of the at least some sensor assemblies and a controller separate from the at least some sensor assemblies. 27. A system comprising: an arrangement of sensor assemblies for provision on a ground surface, wherein at least a given sensor assembly of the sensor assemblies comprises: a housing containing: a divergence sensor for positioning at or below a ground surface above a subterranean structure, wherein the divergence sensor includes a container containing a material and a pressure sensor immersed in the material; anda single-component seismic sensor external to the container of the divergence sensor, the seismic sensor positioned inside the housing above the divergence sensor when the given sensor assembly is implanted into the ground surface. 28. The system of claim 27, wherein the divergence sensor and seismic sensor are physically separated. 29. The system of claim 27, further comprising a controller to: receive data acquired by the seismic sensor;receive data representing ground-roll noise acquired by the divergence sensor; anduse the data acquired by the divergence sensor to attenuate the ground-roll noise in the data acquired by the seismic sensor. 30. The system of claim 27, wherein the divergence sensor is positioned to enable measurement of ground-roll noise. 31. The system of claim 27, wherein the container has a side portion having a larger stiffness than a stiffness of a top portion and a stiffness of a bottom portion of the container, to cause greater directional sensitivity of the divergence sensor to a wavefield propagating in a direction that is generally perpendicular to the side portion. 32. The system of claim 27, wherein the given sensor assembly further comprises electronic circuitry electrically connected to the seismic sensor and the divergence sensor, the electronic circuitry including a communication component to communicate with a controller separate from the given sensor assembly, and the electronic circuitry positioned above the seismic sensor when the sensor assembly is implanted into the ground surface.