Press ' accomplishments in this period include the design of a long-period seismograph , and the first detection of the Earth 's normal modes of oscillation ( " bell ringing " ) , excited by the Great Chilean earthquake , a pioneering application of digital processing to seismic recordings . Press was also closely involved in the construction of a lunar seismograph , first deployed by the Apollo 11 astronauts ( see Lunar seismology )
Great Chilean earthquake
1960 Valdivia earthquake
Frank Press