Magnitude Estimation Based on Integrated Amplitude and Frequency Content of the InitialPWave in Earthquake Early Warning Applied to Tehran, Iran

To optimize magnitude estimation for the earthquake early warning system around the Tehran region, different amplitude‐ and frequency‐based parameters, that is, predominant period (), characteristic period ( τ c ), log‐average period ( τ log ), and peak displacement ( P d ) were analyzed in this article. All parameters were calculated directly from seismic records, with an epicentral distance less than 150 km, and within the initial 3 s of the P waves. The analysis of earthquakes in the 2.4 M L P d and τ c were underestimated, and there was no scaling relationship with the τ log parameter. When combined with the global observations from Japan, Taiwan, and Italy, the results of P d and τ c for the Tehran region produced optimized results.