[meteorite-list] Annual fall rate revisited
From: Matson, Robert <ROBERT.D.MATSON_at_meteoritecentral.com>
Date: Thu Jan 27 18:03:33 2005 Message-ID: <AF564D2B9D91D411B9FE00508BF1C86904EE6363_at_US-Torrance.mail.saic.com> Hi G?ran, Sterling and List, Summarizing Sterling's recent detailed post of annual meteorite fall statistics: Nininger estimate: 500/year on land (2000/year entire earth) 100g - 10kg Canada MORP: 23930/year (radar detection of fireballs) Phil Bland '96 study: 18000 - 84000/year (based on find rate vs. weathering rate of find locale) Sterling Webb study: 59825/year (based on hit rate for houses/ships/cars/trucks) 60000-100000/year to account for underreporting and/or undetected or misattributed damage Matson '03 estimate: 120000-150000/year based on Mojave Desert unpaired field recovery rate of ~1 met/km^2. There is a lot of uncertainty in my 120k-150k estimate due to the unknown terrestrial lifetimes of the finds. It is doubtful that any of the finds that went into my statistics are older than 15,000 years, and most are quite a bit younger than this. Of the 50+ unpaired finds making up the statistics, a dozen are W2, and five are W1. I doubt any one of these 17 is older than 1000 years, and a few may be younger than a decade, suggesting that the 120-150k is conservative. --Rob Received on Thu 27 Jan 2005 05:58:01 PM PST |
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