Seismic switch for strong motion measurement

Title: Seismic switch for strong motion measurement

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Abstract

A seismic switching device that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period.

Inventors:

Harben, Philip E. ^[1]; Rodgers, Peter W. ^[2]; Ewert, Daniel W. ^[3]

(Oakley, CA)
(Santa Barbara, CA)
(Patterson, CA)

Issue Date:: 1995-01-01

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:: 869911

Patent Number(s):: 5420380

Assignee:: United States of America as represented by United States (Washington, DC) LLNL

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: seismic; switch; strong; motion; measurement; switching; device; input; signal; existing; microseismic; station; seismometer; measuring; instrument; monitors; level; passes; data; telemetry; recording; systems; exceeds; user; set; threshold; switched; passed; amount; time; controlled; 15; exceeded; period; length; extended; instant; signal level; strong motion; threshold level; measuring instrument; time period; input signal; switching device; seismic switch; data telemetry; set threshold; /181/340/367/

Citation Formats


                    Harben, Philip E., Rodgers, Peter W., and Ewert, Daniel W. Seismic switch for strong motion measurement.  United States: N. p., 1995. 
        Web.

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                    Harben, Philip E., Rodgers, Peter W., & Ewert, Daniel W. Seismic switch for strong motion measurement.  United States.

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                    Harben, Philip E., Rodgers, Peter W., and Ewert, Daniel W. Sun .  
        "Seismic switch for strong motion measurement".  United States.  https://www.osti.gov/servlets/purl/869911.

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@article{osti_869911,

  title        = {Seismic switch for strong motion measurement},

  author       = {Harben, Philip E. and Rodgers, Peter W. and Ewert, Daniel W.},

  abstractNote = {A seismic switching device that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1995},

  month        = {1}

}

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