×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Seismic lookup by zip code
2

Seismic lookup by zip code

RE: Seismic lookup by zip code

Note that these values are from 1996 USGS maps which are the basis for both the IBC 2000 and IBC 2003.  

The IBC 2006 as well as other codes which have adopted the new maps in advance (i.e. Georgia is still under IBC 2000 but has adopted the new maps) use the USGS 2002 data.  This data has not yet been posted by zip code but may be used with latitude and longitude than can be found by zipcode as described below.

Note that this data is still useful in IBC 2000/2003 situations in that the new maps CAN be an INDICATOR of what a "site specific" study by a Geotech might provide.  Reason being that similiar attenuation equations etc. used by Geotech's to calculate accelerations were implemented in part to make the 2002 maps.    


1.  Go to http://www.maporama.com
2.  In the "Maps" Section on the main page enter the appropriate address information (works Worldwide) and click "Go".
3.  To the lower left of the map page that comes up is an information box which contains the latitude and longitude of the address.
4.  Go to http://eqint.cr.usgs.gov/eq/html/lookup-2002-interp.html
5.  Enter in the latitude and longitude in decimal format and click "Submit Query."
6.  Ss (in percent) is the second number in the right column, S1 (in percent) is the third number in the right column.

RE: Seismic lookup by zip code

(OP)
WillisV,

I knew these maps were going to change for the IBC 2006 but didn't know where to find it.  This is good information to have.  I'm going to bookmark these pages too.

Thanks for the info!

-Mike

RE: Seismic lookup by zip code

The Tiger maps by the U.S. Census also provide latitude and longitude for map locations.

http://tiger.census.gov/

RE: Seismic lookup by zip code

(OP)
WillsV,

You said the USGS 2006 data can still be useful with the IBC 2000/2003 situations.  Do we have a choice, or what?  

Thanks,
-Mike

RE: Seismic lookup by zip code

Mike,

The usefulness comes into play in that the USGS 2002 data can be used to provide yourself with an estimate of what a Geotech might provide for Ss and S1 with a site specific study (i.e. get a preview of what reduction might be possible prior to actually paying for the study).  We have no choice as to what we can use - whichever one the governing code in the state in question references.   

RE: Seismic lookup by zip code

(OP)
WillisV,

Thanks for the info!

-Mike

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources