PSN-L Email List Message

Subject: Re: Mystery event
From: Mark Robinson mark.robinson@...............
Date: Wed, 19 Sep 2007 15:36:01 +1200

Brad Douglas wrote:
> On Tue, 2007-09-18 at 16:56 -0700, Bob Hancock wrote:
>> I believe there are some physicists that follow this site.  I would like to
>> know what they think about the energy involved to make a crater 30 meters
>> across and 6 meters deep, and how that would translate into magnitude.
> A 5m crater releases on the order of 4.2-4.6GJ of energy equivalent to a
> Richter M2.
> There is little literature on craters of this size, so a little
> extrapolation is in order.  I would say a 30mx6m crater would generate
> no more than a M3.

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