Seismic lookup by zip code
Seismic lookup by zip code
(OP)
A site that I have used quite a bit has moved. To lookup seismic data by zip code go to the following link:
ht tp://eqint .cr.usgs.g ov/eq-men/ html/zipco de-06.html
This information is based on 1996 data which is good for IBC2000/2003, generally. I think someone here at eng-tips said that there are a few errors in the values reported on the zip code lookups, so a cross check back to the map is probably a good idea.
The newer codes will be using 2002 data with lookup based on longitude and latitude.
htt p://eqint. cr.usgs.go v/eq-men/h tml/lookup -2002-inte rp-06.html
Regards,
-Mike
ht
This information is based on 1996 data which is good for IBC2000/2003, generally. I think someone here at eng-tips said that there are a few errors in the values reported on the zip code lookups, so a cross check back to the map is probably a good idea.
The newer codes will be using 2002 data with lookup based on longitude and latitude.
htt
Regards,
-Mike






RE: Seismic lookup by zip code
RE: Seismic lookup by zip code
-Mike
RE: Seismic lookup by zip code
RE: Seismic lookup by zip code
-Mike
RE: Seismic lookup by zip code
RE: Seismic lookup by zip code
RE: Seismic lookup by zip code
RE: Seismic lookup by zip code
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Probabilistic ground motion values, in %g, at the Nearest Grid point are:
10%PE in 50 yr 5%PE in 50 yr 2%PE in 50
PGA 29.731501 38.852032 52.698761
0.2 sec SA 70.977837 105.759598 126.108498
0.3 sec SA 63.360321 98.395309 122.763702
1.0 sec SA 25.884750 31.822069 44.953178
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RE: Seismic lookup by zip code
We generally design for an earthquake acceleration response spectrum "defined as corresponding to to a 2-percent probability of exceedance in 50 years" per IBC section 1615.2.1. This would be column four in your post labelled "2%PE in 50." The two values of interest are Ss=1.26 and S1=0.44 for short period and 1-second period accelerations. These numbers then go into a relatively contorted (IMO) set of equations and conditions that result in equivalent seismic forces that are a percentage of W for lateral loads and a percentage of the deadload for vertical loads.
I posted a link to a few high resolution maps in thread507-152485 that will give you a better overall view of seismic risk nationally.
I don't have any recent calcs with me today, but where you live now seems to me to be getting into a little more serious area of seismic design. In the midwest I seldom see seismic forces that are more than a good strong wind.
Regards,
-Mike