Acta Geophysica

, Volume 66, Issue 6, pp 1375–1382 | Cite as

New magnitude scaling relations for earthquake early warning in the Alborz region, Iran

  • Mohammad Sasani
  • Mohammad Reza Ghayamghamian
  • Anooshiravan Ansari
Research Article - Solid Earth Sciences


Rapid magnitude estimation relations for earthquake early warning systems in the Alborz region have been developed based on the initial first seconds of the P-wave arrival. For this purpose, a total of 717 accelerograms recorded by the Building and Housing Research Center in the Alborz region with the magnitude (Mw) range of 4.8–6.5 in the period between 1995 and 2013 were employed. Average ground motion period (\( \tau_{\text{c}} \)) and peak displacement (\( P_{\text{d}} \)) in different time windows from the P-wave arrival were calculated, and their relation with magnitude was examined. Four earthquakes that were excluded from the analysis process were used to validate the results, and the estimated magnitudes were found to be in good agreement with the observed ones. The results show that using the proposed relations for the Alborz region, earthquake magnitude could be estimated with acceptable accuracy even after 1 s of the P-wave arrival.


Earthquake early warning Magnitude estimation Alborz region Average period Peak displacement 



We sincerely thank the anonymous reviewers whose comments lead to improvement of this article. The authors would like to thank Building and Housing Research Center (BHRC) for providing original accelerograms. Figure 1 is made using Generic Mapping Tools (Wessel et al. 2013).


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Copyright information

© Institute of Geophysics, Polish Academy of Sciences & Polish Academy of Sciences 2018

Authors and Affiliations

  1. 1.International Institute of Earthquake Engineering and SeismologyTehranIran

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