Electronic Supplement to
The AHEAD Portal: A Gateway to European Historical Earthquake Data

by Mario Locati, Andrea Rovida, Paola Albini, and Massimiliano Stucchi

Macroseismic Intensity symbols color codes

The standard AHEAD symbol set used to represent macroseismic intensity values on the maps, is based on circles of the same size, warmer colors for higher intensities and colder colors for lower intensities; uncertain intensities have the two colors corresponding to the higher and lower intensity.

Uncertain intensities are represented with two concentric circles; the internal circle has the color of the lower value, and the external circle has the color of the higher value. The unconventional, although widely used value "F", felt, is represented using an empty circle.

The symbol set developed by AHEAD has been included in the "New Manual of Seismological Observatory Practice (NMSOP-2)" (Chapter 12, Musson and Cecić, 2012).

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Table

Intensity	Symbol	Hexadecimal codes		RGB values
		Fill	Stroke	Fill			Stroke
				Red	Green	Blue	Red	Green	Blue
1		#FFFFFF	-	255	255	255	-	-	-
2		#9C9CFF	-	156	156	255	-	-	-
2-3		#9C9CFF	#95FFFF	149	255	255	156	156	255
3		#6FFFFF	-	111	255	255	-	-	-
3-4		#6FFFFF	#3ABB4B	111	255	255	58	187	75
4		#3ABB4B	-	56	181	71	-	-	-
4-5		#3ABB4B	#A0FF00	56	181	71	160	255	0
5		#A0FF00	-	160	255	0	-	-	-
5-6		#99F400	#FBF400	153	244	0	251	244	0
6		#FBF400	-	251	244	0	-	-	-
6-7		#FBF400	#FF9F40	255	255	32	255	159	64
7		#FF9F40	-	255	159	64	-	-	-
7-8		#FF9F40	#FF0000	255	159	64	255	0	0
8		#FF0000	-	255	0	0	-	-	-
8-9		#FF1515	#9F1400	255	0	0	159	20	0
9		#941100	-	148	17	0	-	-	-
9-10		#AA1500	#5E0095	170	21	0	94	0	149
10		#5E0095	-	94	0	149	-	-	-
10-11		#5E0095	#000000	100	0	159	0	0	0
11		#000000	-	0	0	0	-	-	-

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