Fig. 2

Map showing the locations of the Greenwich magnetic observatories considered in this study (indicated by light blue triangles) as well as the estimated epicenter of the 1887 Ligurian earthquake (marked by a red star).

Map showing the locations of the Greenwich magnetic observatories considered in this study (indicated by light blue triangles) as well as the estimated epicenter of the 1887 Ligurian earthquake (marked by a red star).