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RE: Seismic Charges

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Good morning, Rich,


One of my early jobs was working for tunneling contractors in New York City on tunnel projects.  We were doing drill, blast and muck under the Riverside Drive, under a lot of apartments full of concerned citizens.  First, we did a photo survey of all buildings, inside and out, to verify existing damage.  Then we monitored each shot.  That was my job.  I sat outside different apartment buildings with a Sprengnether Instrument, I think it was an accelerometer.  It would record blast vibrations which were limited by the Contract to something like 2 inches per second (memory may be bad here.).  But you might check this out.


Needless to say, I've got great stories from this experience.  The lady who sued us for getting knocked off her toilet, and on and on.


Bob Garner, S.E.


From: Rich Lewis [mailto:seaint04(--nospam--at)]
Sent: Wednesday, October 01, 2008 7:28 PM
To: seaint(--nospam--at)
Subject: Seismic Charges


I was asked a question today that I haven’t seen addressed before.  A client told us they oil and gas industry around his plant was going to be setting off seismic charges for exploration.  The plant in located in Louisiana.  He wanted to know how it might affect his facilities.  We asked him to find out where the charges will be set and what size charge they will be, the energy released.   I’m not sure how I would evaluate the affect on the building.  Obviously we don’t want to set a charge off near a building.  Are there any specific items we should be considering when responding to their questions?  I thinking this may be more of a geotechnical question then a structural question.   Is there any method of converting explosive underground charges into something like a seismic event on a building?


Thanks for your help.