-
-discussed waves moving outward from a source in a spherical manner
-sugested creating an instrument to measure the intensity and direction of the waves
-distinction was made between volcanic induced quakes and plutonic quakes -
-
-Irish engineer and scientist named Mallet went to Naples, Italy to study the after effects of a large earthquake
-his work created some of the earliest theories about seismology based on fact and study. His therios concluded:
-that earthquakes move outward from a central focal point -Mallet proposed the first earthquake monitoring system -
-discoverd that earthquakes usually center around a fault line
-
-builds the first time-recording seismograph on Italy
-
-first seismograph was installed in the U.S. near San Francisco at the Lick Observatory
-
-develops the first electromagnetic seismogragh in which a moving pendulum generates electric current ina coil, aand establishes a network of scismic stations aacross Rusia
-
-Giuseppe Mercalli was a seismologist who created a device to measure the intensity or likelihood of damage that may be caused by an earthquake
-
-an American engineer, studies survey lines across Sam Andreas fault line measured before and after San Francisco earthquake
-proposes an " Elastic Rebound" theory for the origin of earthquakes where accumulated elastic energy is released suddenly by slip on the fault -
-boundary between the earth's crust and mantle discovered by Andrija Mohorovii
-
-proposes a magnitude scale for specifying the size of earthquakes
-logarithmic Richter scale allows a huge range of earthquakes sizes to be conveniently measured -
-discovers the eaarth's solid inner core
-
-first digital global seismographs are installed
