A seismic sensor assembly can include a housing that defines a longitudinal axis; a sensor; sensor circuitry operatively coupled to the sensor; and overvoltage protection circuitry electrically coupled to the housing.

A method and device determine seismic wave information, and a computer readable storage medium implements a method for determining seismic wave information. According to the solution, the method includes determining shallow and deep geophones from top to bottom in a vertical depth direction; determining, according to horizontal component signals acquired by each of the shallow geophones and a preset function, a polarization direction of the horizontal component signal acquired to obtain an azimuth of the shallow geophone; determining, according to an event inclination angle of a scalar signal in horizontal component signals acquired by each of the deep geophones, and a correlation between the deep geophone and a forward adjacent geophone in horizontal component signal based on the event inclination angle, an azimuth of the deep geophone; and determining, according to the horizontal component signals and the azimuth of each of geophones, a radial and a tangential component of the target seismic wave.

Aspects of the present disclosure describe distributed fiber optic sensing systems, methods, and structures that advantageously are employed to determine the location and depth of underground fiber-optic facilities that may be carrying telecommunications traffic.

A mechanical transducer for the detection of acoustic and/or seismic signals is indicated, comprising a continuous or discrete coupled mass-spring network with varying masses and/or spring constants. The mass-spring network is adapted to transform a comparatively small-dimensioned motion parameter of a first mass element into a comparatively large-dimensioned motion parameter of a further mass element. Between the first mass element and the further mass element, the mass-spring network comprises one or more intermediate mass elements, which are coupled to the first mass element and the further mass element by means of spring elements.

In some embodiments, an apparatus and a system, as well as a method and article, may operate to determine a change in fracture volume in a geological formation over a selected time period. Further activities may include determining injected fluid loss as an amount of lost fluid over the selected time period, based on the change in fracture volume, selecting a fluid loss model as a selected model based on the amount of lost fluid, and operating a controlled device based on the selected model. Additional apparatus, systems, and methods are disclosed.

A method and geophysical acceleration sensor (100) for measuring seismic data and also for protecting the sensor from shock. The sensor includes a housing (102); a flexible beam (104) having a first end fixedly attached to the housing; a piezoelectric layer (108) attached to the flexible beam; a seismic mass (112) attached to the flexible beam; and a first movement limiter (130) connected to the housing and configured to limit a movement of the flexible beam. A distance between a tip of the first movement limiter and the flexible beam is adjustable.

Methods and systems, including computer programs encoded on a computer storage medium can be used to preserve edges while performing Gaussian grid smoothing of noise components in subsurface grids to generate geological maps. A subsurface grid is generated from data indicating properties of subsurface formations. A weighting grid is generated by: i) receiving seismic data representing the subsurface formations; ii) generating seismic attributes associated with discontinuities in the subsurface formations; and iii) assigning a particular weight value to weighting grid points that the seismic attributes associated with discontinuities in the subsurface formations indicate the presence of a discontinuity. The subsurface grid is processed by iteratively computing local averages of grid points in the subsurface grid using a compact Gaussian filter weighted by values in the weighting grid. A geological map of subsurface formations is generated based on the filtered subsurface grid.

A logging while drilling tool for measuring a geological formation surrounding a wellbore includes a tool body having one or more sensor pads. Each sensor pad is coupled to the tool body by an extendable coupling that is operable to adjust the radial position of the sensor pad by extending away from or retracting toward the tool body. One or more sensors are mounted to each sensor pads and the sensors are operable to obtain a measurement a property of the formation. The tool also includes a downhole control unit having a transmitter and receiver. The downhole control unit is operable to receive the measurement and transmit the measurement to a surface controller, wherein the transmitted measurement indicates a measurement resolution.

Disclosed is an ocean bottom seismic node for recording seismic signals on the seabed. The ocean bottom seismic node may comprise an arched cathedral buoyant body coupled to a substantially flat bottom metal plate. The buoyant body may be formed of hard plastic (such as plastic injection in a mold) and have one or more cathedral type inner structures with columns that form a plurality of interconnected inner chambers, which may be dry or filled with foam and/or act as ballasts. One or more electronic components may be directly attached to the bottom metal plate (and within one or more of the internal cathedral chambers) and covered/protected by the buoyant body that is water and pressure resistant at seabed depths. The edge(s) of the buoyant body may seal around the metal plate on one or more peripheral edges of the plate and buoyant body.

A housing for a seismic sensor station has a base and a removable lid, which when assembled together form a shell whereby the base and the removable lid both have a shell side and an exterior side. A sensor spike, protruding outward from the shell, may be attached to the base on the exterior side of the base. The housing is further provided with two cable docking ports, each allowing passage of a fiber optical cable from outside to inside the shell. The two cable docking ports are exclusively provided in the removable lid.