History of Seismology

Main

First seismoscope developed in China

132 BC

David Milne coined the name "seismometer".

1841

Robert Mallet studied and developed theories about earthquakes

March 27, 1857

He thought earthquakes moved outward from a central focal point.

Grove Gilbert discovered that earthquakes usually occur around a fault line

May 4, 1872

First seismometer invested by Fillippo Cecchi in Italy

1875

Distant earthquake recorded for the first time

1889

The earthquake was in Japan and the recording was made in Germany,

John Milne develops a seismometer

1892

This seismometer is installed in approximately 40 observatories beginning the global earthquake monitoring.

First seismograph installed in the U.S.

1897

Richard Oldham discovers Earth's core by studying seismic waves

1906

Andrija Mohorovicic discovers the moho discontinuity.

1909

Moho discontinuity is the boundary between the Earth's crust and mantle.

Charles Richter develops the magnitude scale

1935

Inge Lehmann discovers the Earth's inner core

1936

A nuclear explosion is recored by a seismograph

1946

Largest recored earthquake in Chile

1960

M=9.5

The World Wide Standardized Seismic Network is established.

1961

Keitti Aki defines seismic moment.

1966

Apollo astronauts place a seismometer on the moon

1969

first moon quakes are registered

Hiroo Kanamori establishes the moment magnitude scale.

1977

The Comprehensive Nuclear Test Ban Treaty is established

1996

signed by 174 countries