Seismology

By Allstart808

  • 1857

    1857
    R. Mallet, an Irish mechanic goes to Italy to study the damage caused by an earthquake near Naples.

  • 1875

    1875
    F. Cecchi builds the first time - recording seismograph in Italy
    Then higher quality instruments were then developed by British scientists in Japan

  • 1897

    1897
    First seismograph was installed in North America at Lick Observatory near San Jose, California
    It then recorded the 1906 San Francisco earthquake
    E. Wiechert developed the first seismometer

  • Early 1900s

    Early 1900s
    B. B. Galitzen develops electromagnetic seismograph
    All modern seismographs are electromagnetic

  • 1900 - 1910

    1900 - 1910
    R. Oldham identifies P-, S- and surface waves in earthquake records
    Detects liquid in earth’s core from absence direct of body waves at certain distances.

  • 1960s

    1960s
    In 1928 K. Wadati first presented evidence of deep earthquakes located along dipping zones of seismicity where crustal plates plates subduct into the mantle.

  • 1960s Computer in Seismology

    Computers with larger dataset begins too have problems in the 1960s:
    Routine earthquake locations
    inverse problems
    Theoretical seismographs
    Crustal imaging using artificial sources
    Normal modes
    Slip distribution on fault

  • 1970s

    1970s
    First digital and global seismographs installed
    Digital portable seismographs used for special studies ( source scaling and site response)
    Digital seismic data established

  • Early 1800s

    Early 1800s
    Elastic wave propagation in solid materials is developed by Cauchy, Poisson, Stokes, Rayleigh and others.The describe Primary and Secondary body waves (P and S waves) and surface waves.