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(a)
Fig. 3a
Intensity versus distance for the 16 December 1811 New Madrid mainshock (
black circles
)
and the 1 September 1886 Charleston mainshock (
gray circles.
) New Madrid values are shifted
slightly up for clarity. Stars indicate average distance at which each intensity level is observed
(b)
Fig. 3b
Black and gray lines indicate regression curves fit to NM1 and Charleston intensity values,
respectively. Intensity values for New Madrid (
black circles
) are shifted up by 0.1 units for clarity
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