That was a fun read, Ted Brattstrom, Here's another good area in Argentina, and a crater I visited in Kauai:
-44.674044 -68.059731 .740 km el -45.139829 -68.360533 1.36X.41 km size NNW, .472 km el low at NNW bottom, 112 m below .482 km el plateau W of low point, shows as usual no high rim, confirming the formation by erosion within a few seconds of high density very hot directed blast from air burst of ice comet fragment arriving at perhaps 35 km/sec at low angle, maybe 10-45 deg to ground -- common white minerals may arrive from impactor. -45.207627 -68.384444 2 km size crater on plateau, with many fractal craters close together, .378 km el low, 94 m below .452 km el plateau to NE, with .2 km size crater on SE rim, .419 km low, 29 m below .448 km el plateau -- while the very similar rim slope in angle and height, that is the outer boundary of this long NS plateau, is evidence that a much vaster plateau surface was ablated away by the barrage of air burst comet fragments, not by previous or subsequent massive water floods. The plateau surface in general must have been partially melted and levelled during the geoablative process. Four fine ground photos on Google Earth N of this location show some of the flat dark and red layers in this region: Los Altares, Chubut Argentina, ground view, -44.725178 -68.611603 .322 km el, from ted brattstrom [email protected] reply-to ted brattstrom <[email protected]> to Rich Murray <[email protected]>, "[email protected]" <[email protected]> date Sat, Jul 23, 2011 at 7:50 PM subject Re: [meteorite-list] Craters @ -44.602245 -68.356722 7:50 PM (11 hours ago) Aloha - I had a quick look, sure looked like volcanics - looked farther around, really looks like volcanic craters!!! I figured I better really check - so, a quick one.... "geological map argentina" in google http://geology.about.com/library/bl/maps/blargentinamap.htm Yup, Cretaceous-Tertiary volcanics... [ Rich Murray: Dennis Cox says surface rocks melted by air bursts are often mistaken as volcanic. ] Alas, not all craters / circular features are impact craters... [ Rich Murray: According to simulations by Mark Boslough, air bursts result in complex directed jets at over 5,000 deg Kelvin, capable of melting sand into glass, and much more... I see that the jets can create a huge variety of features on the ground -- typically shallow and rimless complex carvings. ] (all of my local craters are non-impact, and they are exciting enough! much as I enjoy impact craters. The first 2 are about 5 km from my house, the 3rd is about 8-9 km away) [ Rich Murray: http://hvo.wr.usgs.gov/kilauea/update/maps.html Pu' u O' o volcano, Hawai'i Hawai'i Volcanoes National Park 19.388960 -155.110755 .801 km el 19.151552 -151.502513 -5.5260 km el question: what is this? typical of deep ocean floors? flat floor with ~1-4 km parallel N-S ridges, with ~.1 km rippling E-W -- provides uniform background texture for assessing craters, volcanoes, turbidity currents, and megatsunamies... 21.880050 -159.445920 Here's a crater I visited: Pu'u wanawana, Kauai, fine ground photos from circular dirt road to W and SSE. .038 km el low, .21 km size outer edge, 16 m under .054 km el top at N rim, 26 m under .062 km el high at fork in dirt road to NEE, 20 m above paved road to SWW, In April, 2009 I found the bowl to be full of inpenetratable thorns -- also the red surface lava at the rim top is in large and small framents, with surface glazes and melting. My wife was waiting in the car, and I hadn't yet learned to use my BlackBerry Storm camera... Note the lack of associated lava flows downhill from this feature. How long could this crater have lasted, given the amount of rain? half-crater, light color, 19.737979 -155.935276 1.195 km el top, 63 m above 1.132 low NNE rim, many dark volcanic vents nearby, ? mystery hill, light orange, 19.799852 -156.009117, .100 km el top, SE from sea .81X.36 km, ] Pu'u 'O'o live http://volcanoes.usgs.gov/hvo/cams/POcam/ Halema'uma'u live http://volcanoes.usgs.gov/hvo/cams/HMcam/ Halema'uma'u panorama live http://volcanoes.usgs.gov/hvo/cams/KIcam/ Mauna Loa live http://volcanoes.usgs.gov/hvo/cams/MLcam/ Cheers - ted ________________________________ From: Rich Murray <[email protected]> To: [email protected]; Rich Murray <[email protected]>; Rich Murray <[email protected]> Sent: Friday, July 22, 2011 6:11 PM Subject: [meteorite-list] -44.602245 -68.356722 km size, 45 m deep, more craters in all directions for great distances...: Rich Murray 2011.07.22 -44.602245 -68.356722 km size, 45 m deep, more craters in all directions for great distances...: Rich Murray 2011.07.22 -44.602245 -68.356722 .623 km el low, 45 m under .628 km el to NE, km size, more craters in all directions for great distances. [email protected], [email protected], [email protected], ted brattstrom <[email protected]>, [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
