DETERMINATION OF THE LOCAL MAGNITUDE SCALE (ML) FOR MONGOLIA

Adjusting the local magnitude scale to match the regional tectonic characteristics is crucial to enhance studies focused on evaluating seismic risk and measuring seismic activity in geologically dynamic zones. In this study, we developed a local magnitude scale for Mongolia. Using the Mongolia earthquake catalog for the period from 2012 to 2019, we analyzed 261 earthquakes with magnitudes ˃3.5 that occurred within a 1000 km epicentral distance and were recorded by at least five broadband stations. The compiled data set includes 8616 horizontal peak amplitude measurements from 144 broadband stations. We performed a detailed linear regression analysis to develop the local magnitude formula in accordance with the guidelines of the International Association of Seismology and Physics of the Earth’s Interior. As a result, the new local magnitude formula is expressed as: M L =log10( A )+0.9287log10( R )+0.0012 R −1.66. In addition, we determined the correction factors S for each station.