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To: Maurice Winn who wrote (50930)	6/14/2004 6:51:55 AM
From: Elroy Jetson	Respond to of 74559

Why do you ask? Are you in charge of the Devonport modernization committee? Now Greymouth is a different matter. You can get started modernizing there right away.

To: Maurice Winn who wrote (50930)	6/14/2004 7:54:34 AM
From: elmatador	Respond to of 74559

The only big thing the one that hit Tunguska. All the big ones have already hit n those 4.5 billion years. We've got a too big Moon for the size of the planet which competes for the hits too.

To: Maurice Winn who wrote (50930)	6/14/2004 11:33:21 AM
From: AC Flyer	Read Replies (1) \| Respond to of 74559

>>ACF, any idea on the likelihood of a 10 metre tsunami from an incoming<< The currently accepted size-frequency distribution for earth impacts was calculated by Gene Shoemaker. According to Shoemaker, the expected interval between Earth impacts of objects 160m in diameter, a size large enough to produce a significant tsunami, is 10^3.6, or approximately 4,000 years. We have more to fear from smaller objects that impact land or in the case of stony meteorites, produce airbursts like Tunguska. 75m objects capable of destroying cities have an expected arrival interval of 10^3 years, according to Shoemaker. spaceguardindia.com These generally-accepted probabilities may understate the danger. For example: The start of the European Dark Ages coincided with a series of crop failures in 536-540 AD, possibly caused by a cometary impact. spacedaily.com 2) It is possible that a huge bolide impact off the coast of New Zealand in 1422 created a 200m tsunami that destroyed one of the great Chinese exploration and trading fleets of the period. 1421.tv nzherald.co.nz