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Seismometer san francisco california

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Noel Isac
Seismometer san francisco california

Generic requirements for producing a functional seismic instrument are indicated. The performance limit of any such instrument is primarily determined by friction. Although a commonly treated form of friction, viscosity of air, can be important; it is the author's belief, from years of studying mesoanelastic complexity-that internal friction of test mass support structures is the primary culprit when it comes to looking for low-level long-periodic motions of the earth.These mesodynamic properties of seismic instruments are presently unknown to the geoscience community. Thus a proposal is offered to the geoscience community-a simple test of their instruments to prove or disprove some of the claims of this paper.The Seismometer san francisco california is fundamentally a very simple instrument to understand. One need ``only'' to suspend a test mass and look for relative motion between it and the earth. It is the inertial property of the test mass that is used to advantage; i.e., Newton's 1st law, which states that an object at rest wants to remain at rest in the absence of net external force acting on it. Thus motion of the earth's surface gives rise to relative motion between the earth and the test mass. Most modern seismometers use a transducer and a feedback network to provide force-balance on the test mass. The error signal provided to the feedback network is a measure of mass motion were it permitted to occur. The system is effectively the same in many respects, although more will be said about this technique later. vibration


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Noel Isac
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