In 1905, bolore, a French geologist, published Seismogeography, this book is based on historical and macroeconomic data, first detailed the geographical distribution of earthquakes in various regions of the world. During the same period, the British seismologist Milne for the first time recorded with the instrument recorded the global earthquake map, given 1899 to 1903 by the instrument measured the world's 323 major earthquakes in the geographical distribution.
By the early 1950s, Gutenberg and Richter used the nearly 50-year seismic data to quantify the global seismic distribution (including earthquake magnitude, frequency, focal depth, and regional distribution) based on the magnitude scale they created, made a detailed statistical analysis. However, due to the distribution and observation level of the network, moderate intensity earthquakes in some areas still have great omission. Until WWSSN was established in the 1960s, more accurate earthquakes above the medium intensity of the earth could be measured, and more comprehensive data were accumulated for the global seismic activity study.
Source: Atlas of China's Natural Disaster System
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