Explanation of the Plates.
Plate I.—Map showing general distribution of the shock. Reprinted,
with corrections, from Symons's ' Meteorological Magazine'
for May, 1884.
Plate II.—Map showing the general distribution of structural damage
over Essex. Reprinted from Symons's ' Meteorological
Magazine' for May, 1884.
Plate III.—Map showing the general distribution of the shock, with
reference to the solid geology of the seismic area. The
coast stations at which the earthquake was felt are entered
in this map, but the other places within the circle where
the disturbance was felt have, for the sake of clearness,
been mostly omitted as being unnecessary for the discussion
of the principles illustrated by the map. Outside the
circle the records are complete. Photo-transferred from a
drawing by Mr. William White.
Plate IV.—Map showing the general distribution of intensity as indicated
by the nature and amount of damage. The intensity is
indicated by the size and approximation of the black dots.
The drawing has not brought out with sufficient distinct-
ness the N.E.—S.W. extension of the main axis of
intensity from Wivenhoe to Peldon. This map serves
also to show the distribution of the damage in Essex in
connection with the superficial geology, together with the
directions of propagation of the movement as given by
the most trustworthy observations. The superficial
geology is taken from Mr. W. H. Dalton's Survey map,
48 S.W. Photo-transferred from a drawing by Mr. William
White.
Of the cuts in the text, Figs. 2, 5, 6, 7, 8, and 11 are reprinted from
the ' Illustrated London News.'
WEST, NEWMAN AND CO., PRINTERS, 54, HATTON GARDEN, LONDON, E.C.