[meteorite-list] falls per year

From: Jeffrey N. Grossman <jgrossman_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:13 2004
Message-ID: <4.3.2.7.2.20010228123729.028f1b50_at_127.0.0.1>

The collection efficiency is certainly a big uncertainty in my calcs. The
reason for taking the most densely populated areas is to maximize this
efficiency. Sure, dense vegetation, uneducated population, and even
industrialization work against you. My point was to get a minimum value,
so I took a 30% efficiency. I don't believe efficiency could be any
greater. This gives my lower limit calculation. To get the number up to
10,000-50,000 per year would require an efficiency in Japan, India, and N.
Europe of 2-10%. 2% seems implausible to me for Japan, but perhaps it's
possible. The 10% seems more possible.

jeff

At 11:53 AM 2/28/2001, Michel Franco wrote:
>Hello Jeff and List,
>
>How many is THE QUESTION and so often asked that we came last week to talk
>about it with Claude PERRON, in charge of the Lab when Brigitte Zanda is the
>US.
>
>he gave me teh following figures:
>
>Between 10 000 and 50 000 falls per year of meteeorites weighing more than
>20 grams.
>Another figure is 100 falls over 100 kg per year.
>Above figures are ocean included.
>
>Your analysis makes sense but there is a unknown factor ( you said it is
>0.30) but this a very difficult factor to estimate. I personnaly think that
>this factor can be influenced by the following:
>
>density of population. coef increases with density
>annual earning ( the more you earn the less you live outside) coef decreases
>with earning
>average vegetation height coef decreases with height.
>
>Best wishes
>
>Michel FRANCO

Dr. Jeffrey N. Grossman phone: (703) 648-6184
US Geological Survey fax: (703) 648-6383
954 National Center
Reston, VA 20192, USA
Received on Wed 28 Feb 2001 01:24:06 PM PST