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FEMA 310 Maps MCE & 1 Sec g. Values

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The FEMA maps cover the northern California (Bay Area) in in all 6 maps

Map 1 &  Map2;
Map 7 & Map 8;
Map 31 & Map 32;

However, when I try to obtain the Ss & S1, all three versions have 3 different results. These are not the round off errors.

I try the USGS prepared software of getting Ss & S1 and got another set of numbers (more in line with Map 7 & 8)

What is going on with these maps?

Thanks millions.

Szuchuan Chang, SE
Cupertino, CA


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