Method for conducting multiple natural frequency seismic surveys
First Claim
1. A method for conducting a multiple natural frequency seismic survey, the method comprising the steps of:
- providing a plurality of natural frequency seismic motion sensors, each having a different natural sensing frequency, each natural sensing frequency being selected to lie within a range of frequencies present in a reflected seismic wave, each of said natural frequency seismic motion sensors being coupled to the earth;
actuating a source of seismic energy; and
recording indications of reflected seismic waves sensed by said plurality of natural frequency seismic motion sensors in response to actuation of said source of seismic energy.
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Abstract
A seismic sensor platform comprises an open frame and a plurality of seismic motion sensors vertically positioned in a common horizontal plane in spaced relationship around the periphery of the open frame. A spike associated with each of the sensors extends beneath the open frame for anchoring each of the sensors in the earth. The frame includes a shield for protecting the sensors from physical damage and for shielding them from seismic noise. Second and third pluralities of horizontally positioned sensors may be provided on the frame, orthogonally positioned with respect to each other to sense orthogonal components of reflected seismic waves. The sensors may each be of a different natural frequency to optimize the multi frequency output of the sensor array.
26 Citations
7 Claims
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1. A method for conducting a multiple natural frequency seismic survey, the method comprising the steps of:
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providing a plurality of natural frequency seismic motion sensors, each having a different natural sensing frequency, each natural sensing frequency being selected to lie within a range of frequencies present in a reflected seismic wave, each of said natural frequency seismic motion sensors being coupled to the earth; actuating a source of seismic energy; and recording indications of reflected seismic waves sensed by said plurality of natural frequency seismic motion sensors in response to actuation of said source of seismic energy. - View Dependent Claims (2, 3, 7)
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4. A method for conducting a multiple natural frequency seismic survey, the method comprising the steps of:
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providing a plurality of groups of natural frequency seismic motion sensors, each group having a different natural sensing frequency, each natural sensing frequency being selected to lie within a range of frequencies present in a reflected seismic wave, each group of natural frequency seismic motion sensors being coupled to the earth; actuating a source of seismic energy; and recording indications of reflected seismic waves sensed by said plurality of groups of natural frequency seismic motion sensors in response to actuation of said source of seismic energy. - View Dependent Claims (5, 6)
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Specification