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    Here is an ultra sensitive earthquake detector circuit that can sense seismic vibrations.
    It can be used to detect vibrations in the Earth. So it is an ideal device to monitor entry passages. The circuit exploits the direct piezo electric property of the piezo element used in buzzers.

    The Lead Zirconate crystals present in the piezoelement can readily store current and can release the current when the orientations of the crystals are disturbed through mechanical vibrations. IC1 amplifies the signals from the piezo element and the high output from IC1 switches on T1. When T1 conducts, trigger pin 2 of the monostable (IC2) will grounded to give 3 minutes high output.

    This high output is used to sound alarm and to light LED. VR adjusts the sensitivity of piezo element. Glue the fine side of the piezo element on the floor (if used as an entry alarm) or inside a metal box (if used to bury in soil to detect earth borne vibrations).

    Earthquake Detector Schematic

    earthquake detector schematic

    earthquake detector circuit schematic

    attentionThe author D Mohankumar is not an active member anymore. Please take into consideration that the presented information might not be correct.
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    32 Responses to "Earthquake Detector Circuit"

    1. please send pcb layout of this seismic sensor

    2. sir,
      please give me circuit diagram for smart vibration sensor and also alternate solution for that…i’ll be very thankful to you sir. waiting for your reply

    3. amit rana says: on December 17, 2010 at 2:49 pm

      sir ,
      please give me circuit diagram for earth quake detetor and please sir explane the circuit diagrame.

    4. sir,
      i am going to do a mini project in siesmic sensor,plz give me a circuit diagram for this and also give me a brief explanation with working of the ckt diagram.

      • vinas patel says: on March 23, 2012 at 5:45 pm

        hey shashi if u have any document related to seismic sensor and pls explain me about this ..i am doing this as a my mini project.pls mail me about this.i am very thankful 2 u.

    5. sir,
      i am going to do a mini project in siesmic sensor,plz give me a circuit diagram for this and also give me a brief explanation with working of the ckt diagram.

    6. i am thinking of doing this sensor as my project. Can you give me more details and explanation .

    7. Very interesting accelerometer. It could work as a simple mission timer.

    8. Varun Vishvakarma says: on February 28, 2011 at 3:07 pm

      Sir
      i am going to do a mini project in siesmic sensor,plz give me a circuit diagram for this and also give me a brief explanation with working of the ckt

    9. Anand Rathod says: on May 24, 2011 at 11:54 am

      Sir,
      Please sir give me the schmetic diagram of pressure sensor circuit.

      Because write now i stopped in this portion.

      Thank you.

    10. jason loke says: on May 25, 2011 at 8:43 am

      sir, i am doing a mini project, can you send me a seismic diagram with a layout for me .. thank you

    11. jason loke says: on May 25, 2011 at 8:50 am

      please send me a seismic layout and explain how its work .. important because i am going to do this project for me professor

    12. plz give me the pcb layout of seismic sensor and also its construction and working

    13. will u please send me the breaf details about the sesmic sensors.if you can , it helps for my project.

    14. I am actually doing this sensor for my final year project. Unfortunately, my lecturer wants me to interface this circuit with another dc motor circuit. Is it possible sir? And can u send me the pcb layout for this circuit sir? tq.

    15. snehalatha says: on December 15, 2011 at 7:09 pm

      sir,
      please explain the working of seismic sensor and pcb layout.i’m going to take this is as my mini project.so it will be helpful to. me

    16. respected sir,
      please explain the working and operation of this seismic sensor and pcb layout.I’m going to take this is as my mini project.plz reply as soon as possible

    17. respected sir,
      we have planned to do a mini project regarding seismic sensor .i request u give the circuit diagram and working of it .

    18. sir,

      please give me circuit diagram for earth quake detetor and please sir explane the circuit diagrame.

    19. sir can u send me the layout of this mini project ….plz

    20. sir,
      i am going to do a mini project in seismic sensor,plz give me a circuit diagram for this and also give me a brief explanation with working of the ckt diagram & explanation the working & ckt diagram of every component .

    21. sir, when i simulate the circuit, i have getting the output in buzzer as 0V. when see graph the trigger became DC (direct current). actually there must be AC (alternatif current). so how to set the trigger to became AC from DC. plz help me sir. and please send the details of the circuit diagram

    22. can u please give some more details

    23. hi sir,
      is this circuit working fine??
      i tried it in multisim,but its not working.
      what could be the problem sir???

      • The author of this project is not active here anymore so we cannot guarantee it works. But looking over it I think it should work. The critical component is the piezoelectric element and its location. Basically there are some small vibrations happening before the explosive movements of the actual earthquake and those are sensed by the detector.

    24. sir please let me know what kind of piezo element should i use and instead of piezoelement can i use some other sensor which is easily available in the market coz i am not gettin the piezo element in the market….sir please let me know for the alternative which can ne used to run the project

    25. William Hoff says: on January 8, 2014 at 2:46 pm

      the reader might do well to consider how the piezo unit is arranged in an automotive alarm vibration sensor. it’s no more than the usual piezo buzzer disk with one end fixed and a weight attached to the other. you can probably obtain these as throwaways at the local automotive alarm installation store.

    26. praneeth says: on April 10, 2014 at 4:55 pm

      thanks to the publisher but i wish there could have been some more detailed explanation about the circuit.Trust me this project really works…….

    27. M.SHAMOON says: on May 13, 2014 at 12:48 pm

      PLz,Can any tell me the complete working of this earthquake circuit…..how it is working?i am waiting your answers…..

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