Regression Relations for Magnitude Conversion of Northeast India and Northern Chile and Southern Peru

For any seismic study, particularly seismic hazard estimations, land use control, and other seismological applications, a unified earthquake catalog is essential. It was necessary to convert various earthquake magnitude classes into a single unsaturated magnitude scale. One magnitude is transformed into a preferred magnitude using regression relationships. It is necessary to apply General Orthogonal Regression (GOR) since earthquake magnitudes are inaccurate. For the purpose of estimating the slope of a regression analysis, the use of GOR needs and the proper application of needs are crucial. Regression relationships for magnitude conversion that are peculiar to the Northeast Indian region and have been published in several research studies using the SR, ISR, and GOR methods are covered in this chapter. Regression relationships for the conversion of body and surface wave magnitudes are also presented for Northern Chile and Southern Peru. To cover the complete magnitude range, Das et al(2023) additionally included several GOR relations that were based on global data. A crucial component of creating a single earthquake catalogue is the conversion regression relationship since any error in the magnitude conversion procedure could cause significant bias in the seismicity metrics.