Li Zan, Liu Ruifeng, Kong Handong, Wang Zibo, Yuan Nairong. 2019: Energy magnitude determination of moderate-strong earthquakes. Acta Seismologica Sinica, 41(3): 289-301. DOI: 10.11939/jass.20180139
Citation: Li Zan, Liu Ruifeng, Kong Handong, Wang Zibo, Yuan Nairong. 2019: Energy magnitude determination of moderate-strong earthquakes. Acta Seismologica Sinica, 41(3): 289-301. DOI: 10.11939/jass.20180139

Energy magnitude determination of moderate-strong earthquakes

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  • Received Date: December 17, 2018
  • Revised Date: February 14, 2019
  • Available Online: May 22, 2019
  • Published Date: April 30, 2019
  • This paper, based on the seismic wave attenuation characteristics, explores a method for utilizing broadband seismic waveform data to measure seismic energy ES and energy magnitude Me. The energy magnitudes Me of four overseas and four domestic moderate-strong earthquakes are measured by using broadband teleseismic P waveform data with epicentral distance in the range of 20°−98°. The comparison of surface wave magnitude MS, moment magnitude MW and energy magnitude Me of several earthquakes shows that: surface wave magnitude MS represents the magnitude of the energy of seismic wave radiating at a fixed frequency; the moment magnitude MW is closely related to the static structural effects such as the length of fault, the width of fault and the average dislocation amount of the source rupture produced by the earthquake; the energy magnitude Me reflects source dynamic characteristics and is closely related to the dynamic characteristics of the seismic source. The energy radiated by the earthquake in the form of seismic waves is mainly concentrated near the corner frequency of the source spectrum, so the energy magnitude Me is more suitable to describe the destructiveness of the earthquake. Therefore, joint determination of surface wave magnitude MS, moment magnitude MW and energy magnitude Me are of great significance for quantifying and evaluating the disasters caused by earthquakes or tsunamis.
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