Spatiotemporal characteristics of disaster-inducing earthquakes and their losses in China from 1949 to 2021
In order to understand the disaster-causing laws of earthquakes,formulae the disaster prevention and mitigation planning effectively,and mitigate earthquake disaster losses,earthquakes data with the magnitude not less than 5.0 and their losses in China and surrounding areas were sorted out from 1949 to 2021.Their distribution characteristics in terms of time and space were studied in detail,and the following conclusions were obtained,453 disaster earthquakes caused about 350,000 deaths,760,000 injuries,and 1 124.9 billion RMB of direct economic losses(converted value),of which caused by major seismic hazards accounted for a huge proportion.From the time perspective,there are obvious earthquake-prone and less earthquake-prone years,and the number of catastrophic earthquakes has increased in chronological terms.The economic losses caused by earthquakes accelerated quickly,and the casualties decreased by varying degrees.Geographically,the frequency of earthquakes on the west side of the HU Huanyong Line was higher,but the average loss was lower.In the economic subregions,the western region had the highest frequency of earthquakes and the lowest average loss.The eastern region had the second highest frequency of earthquakes and the highest average loss.The central and northeastern regions had the lowest frequency of earthquakes and medium average losses.Yunnan and Sichuan provinces had the highest frequency of earthquakes and the most severe earthquake losses.For earthquakes with similar intensity in the same period,the casualties and economic losses were more serious in economically developed and densely populated areas.In the 21st century,the frequency of earthquakes with low magnitudes but large-scale disasters increased,and most of them occurred on the east side of the HU Huanyong Line and in the eastern and central parts in the economic subregion.In the events of major disasters caused by minor earqhquakes,the focus has shifted from a high number of casualties to significant economic losses.
disaster-inducing earthquakescasualtieseconomic lossesspatiotemporal distributionearthquakes with low magnitudes but large-scale disasters
NETL
NSTL
万方数据
