eugen leitl eugenleitlorg thu 25 jul 2002 jon wrote anyone considered fact occurrances appear increasing im aware maybe publicity surrounding weve started looking weve actually started looking deep infrasound pressure waves network stations designed enforced nuke test ban treaty weve discovered pretty big impacts norm current infrasound stations detect bolidesmeteoroids 10 tnt scale 10 kt events relatively frequent number people died tunguska event 1908 1015 mt despite hitting middle nowhere http21623939100searchqcache637jrhgdb5gcwwwlpiusraedumeetings5thmars99pdf6081pdfbolideimpactktwavehlenieutf8 earth atmosphere large number bright light flashes energies light impulse 01 1 kt tnt higher registered usa dod satellites equipped photoelectric detectors 911 intense light impulses created impacts meteoroids disrupted atmosphere mainly altitudes 3045 km several techniques assessment meteor oids characteristics light curves heights peak intensities developed 312 using techniques preatmospheric kinetic energy fifth international conference mars initiation sandstorms ivnemtchinov oppopova varybakov vvshuvalov number events determined biggest event 1 february 1994 ini tial energy high 3040 kt tnt initial mass 400 bright flash light energy 45 kt tnt caused meteoroid deeply penetrated atmosphere angle 45 degrees velocity 24 kms disintegrated altitudes 34 km 21 km 912 another famous impact event sikhotealin meteor shower 12 february 1947 event may compared 1 february 1994 event initial masses meteoroids probably well angle trajectory inclination initial velocity sikhotealin almost twice smaller caused fragmentation 1 february 1994 meteoroid higher altitudes probably large fragments constitute smaller part pre breakdown mass contrast sikhotealin event rarefied atmosphere mars analogous im pactors penetrate deeper layers atmos pherethey disintegrate lower 15 km even reach planet surface partially disrupted form first disruption would occur meteoroid similar caused 1 february 1994 enter martian atmosphere body would reach mars surface tense swarm fragments meteoroid similar caused sikhotealin event would hit surface form large frag ments due low velocity create crater size similar undisrupted meteoroid httpxentcommailmanlistinfofork fri 26 jul 2002 112911 0200 cest asteroids anyone