*6.1.1 Kanamori*

Hiroo Kanamori [12] introduced earthquake locating based on amplitudes with application to real-time seismology. He identified the optimum epi- or hypocenter with the location of the minimum standard deviation of the magnitudes calculated from the amplitudes recorded at the different seismic stations. He implemented an empirical 1D model for the amplitude (acceleration) decay with distance. Thus, we take PGV/SA and the amplitude – distance power law according to Eq. 1 and choose the following cost function according to Eq. 3 and equivalent to Kanamori's principle:

$$\text{cost function} = \text{STD}(\log \mathbf{10}(\mathbf{A0}\_i)).\tag{10}$$
