The 1855 Visp (Switzerland) Earthquake: A Milestone in Macroseismic Methodology? - Historical Seismology: Interdisciplinary Studies of Past and Recent Earthquakes - page 224

Fig. 1 Segment of map taken from the Physical Atlas (Section Geology )byHermann
Berghaus (1888), issued by J. Perthes editorial house, Gotha. In the map, limits of the perception of
two important European earthquakes (Lisbon 1755 and Visp 1855) are drawn. Private collection,
Prague