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    제목 A school seismometer
    작성자 영일교육시스템 (ip:)
    • 작성일 2015-12-10 17:56:03
    • 추천 추천하기
    • 조회수 1201
    • 평점 0점

    IntroductionEducational data logger

    Seismic waves form part of the UK National Curriculum (see below) and the seismometer provides an opportunity for experimental work using a data logger or oscilloscope.

    Double Science Key Stage 4 Waves — Seismic waves
    Pupils should be taught that longitudinal and transverse earthquake waves are transmitted through the Earth, and how their travel times and paths provide evidence for the Earth's layered structure.

    Equipment required

    Seismic probes

    Wooden pegs with sensors available from:

    Peter Chamberlain
    8 Kingsley Court
    New Wanstead
    London E11 2SB UK
    Tel : 020 8518 8378
    Fax : 020 8925 3663
    E-mail : PeterChamberlain1@Compuserve.com

    Experiment setup

    School Seismometer experimental set up

    Figure 1: experiment set up

    The output of the piezo sensor is connected via a suitable interface such as Pico’s ADC-212 to a laptop computer.

    Possible investigations

    • Demonstration of the range of seismic waves. The time-scale on the interface is set so that the screen is filled in about 10 seconds. A sharp tap on the ground with a mallet was found to give a more intense seismic pulse than having pupils jumping up and down. The observed range depends on the sensitivity level of the sensor set in the software and the nature and water content of the soil. Certainly ranges of about 3 metres can be detected. Seismic waves generated by trains and road traffic can be detected but sensors need to be close to the wave source. Safety arguments suggest that such experiments are not advisable.
    • Estimation of the velocity of seismic waves. (See attached sample results.)
    • Detecting seismic waves from different sources such as near a busy road (more sensitive seismic detector required), near a pile driver or with children jumping together.
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