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

Acta Geophysica

Anooshiravan Ansari¹  Mohammad Sasani¹  Mohammad Reza Ghayamghamian¹ 

[1] International Institute of Earthquake Engineering and Seismology

关键词: Earthquake early warning;    Magnitude estimation;    Alborz region;    Average period;    Peak displacement;   

DOI  :  10.1007/s11600-018-0213-3

学科分类：地球科学(综合)

来源: Polska Akademia Nauk * Instytut Geofizyki

【 摘 要 】

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.

【 授权许可】

Unknown