Re: [SWR] Martian sinkhole
That is cool!! Sign me up for the survey trip Peter On Aug 18, 2011, at 1:23 PM, Lee H. Skinner wrote: > Could this entrance have been triggered by a meteor falling over a lava tube? > > http://hirise.lpl.arizona.edu/ESP_023531_1840 > > and click on this one in your browser for maximum detail: > > http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > > Lee Skinner > > ___ > SWR mailing list > s...@caver.net > http://caver.net/mailman/listinfo/swr_caver.net ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
That is cool!! Sign me up for the survey trip Peter On Aug 18, 2011, at 1:23 PM, Lee H. Skinner wrote: > Could this entrance have been triggered by a meteor falling over a lava tube? > > http://hirise.lpl.arizona.edu/ESP_023531_1840 > > and click on this one in your browser for maximum detail: > > http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > > Lee Skinner > > ___ > SWR mailing list > s...@caver.net > http://caver.net/mailman/listinfo/swr_caver.net ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
That is cool!! Sign me up for the survey trip Peter On Aug 18, 2011, at 1:23 PM, Lee H. Skinner wrote: > Could this entrance have been triggered by a meteor falling over a lava tube? > > http://hirise.lpl.arizona.edu/ESP_023531_1840 > > and click on this one in your browser for maximum detail: > > http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > > Lee Skinner > > ___ > SWR mailing list > s...@caver.net > http://caver.net/mailman/listinfo/swr_caver.net ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
Hi Lee, Yes, the event you suggest is what we also suspect. This image is relatively new, but we have also been trading around a couple of other instances of an apparently similar crater breaching of subsurface cavity. A colleague in London recently sent me another entry into the Martian Cave sweepstakes! BTW, on a related note, we are holding a Planetary Caves workshop at the NCKRI Headquarters from 25-28 October to consider the whole range of extraterrestrial cave issues for Mars and other bodies. Here is the website if anyone is interested. http://www.lpi.usra.edu/meetings/caves2011/ Cheers, Penny Boston On Aug 18, 2011, at 11:23 AM, Lee H. Skinner wrote: > Could this entrance have been triggered by a meteor falling over a lava tube? > > http://hirise.lpl.arizona.edu/ESP_023531_1840 > > and click on this one in your browser for maximum detail: > > http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > > Lee Skinner > > ___ > SWR mailing list > s...@caver.net > http://caver.net/mailman/listinfo/swr_caver.net ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
Hi Lee, Yes, the event you suggest is what we also suspect. This image is relatively new, but we have also been trading around a couple of other instances of an apparently similar crater breaching of subsurface cavity. A colleague in London recently sent me another entry into the Martian Cave sweepstakes! BTW, on a related note, we are holding a Planetary Caves workshop at the NCKRI Headquarters from 25-28 October to consider the whole range of extraterrestrial cave issues for Mars and other bodies. Here is the website if anyone is interested. http://www.lpi.usra.edu/meetings/caves2011/ Cheers, Penny Boston On Aug 18, 2011, at 11:23 AM, Lee H. Skinner wrote: > Could this entrance have been triggered by a meteor falling over a lava tube? > > http://hirise.lpl.arizona.edu/ESP_023531_1840 > > and click on this one in your browser for maximum detail: > > http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > > Lee Skinner > > ___ > SWR mailing list > s...@caver.net > http://caver.net/mailman/listinfo/swr_caver.net ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
Hi Lee, Yes, the event you suggest is what we also suspect. This image is relatively new, but we have also been trading around a couple of other instances of an apparently similar crater breaching of subsurface cavity. A colleague in London recently sent me another entry into the Martian Cave sweepstakes! BTW, on a related note, we are holding a Planetary Caves workshop at the NCKRI Headquarters from 25-28 October to consider the whole range of extraterrestrial cave issues for Mars and other bodies. Here is the website if anyone is interested. http://www.lpi.usra.edu/meetings/caves2011/ Cheers, Penny Boston On Aug 18, 2011, at 11:23 AM, Lee H. Skinner wrote: > Could this entrance have been triggered by a meteor falling over a lava tube? > > http://hirise.lpl.arizona.edu/ESP_023531_1840 > > and click on this one in your browser for maximum detail: > > http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > > Lee Skinner > > ___ > SWR mailing list > s...@caver.net > http://caver.net/mailman/listinfo/swr_caver.net ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
>Could this entrance have been triggered by a meteor falling over a lava >tube? > >http://hirise.lpl.arizona.edu/ESP_023531_1840 > >and click on this one in your browser for maximum detail: > >http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > >Lee Skinner Maybe, but the absence of obvious raised crater rim and ejecta suggest that the "crater" is just the angle-of-repose slope where a thick overlying bed of loose sand has poured into the underlying bedrock hole. The ring around the upper part of the slope might hint that a wider area of rock has started to sag below (or perhaps the ring is just a single more-cemented layer). The stereo view that the page promises for later should be informative. --Donald ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
>Could this entrance have been triggered by a meteor falling over a lava >tube? > >http://hirise.lpl.arizona.edu/ESP_023531_1840 > >and click on this one in your browser for maximum detail: > >http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > >Lee Skinner Maybe, but the absence of obvious raised crater rim and ejecta suggest that the "crater" is just the angle-of-repose slope where a thick overlying bed of loose sand has poured into the underlying bedrock hole. The ring around the upper part of the slope might hint that a wider area of rock has started to sag below (or perhaps the ring is just a single more-cemented layer). The stereo view that the page promises for later should be informative. --Donald ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
Re: [SWR] Martian sinkhole
>Could this entrance have been triggered by a meteor falling over a lava >tube? > >http://hirise.lpl.arizona.edu/ESP_023531_1840 > >and click on this one in your browser for maximum detail: > >http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg > >Lee Skinner Maybe, but the absence of obvious raised crater rim and ejecta suggest that the "crater" is just the angle-of-repose slope where a thick overlying bed of loose sand has poured into the underlying bedrock hole. The ring around the upper part of the slope might hint that a wider area of rock has started to sag below (or perhaps the ring is just a single more-cemented layer). The stereo view that the page promises for later should be informative. --Donald ___ SWR mailing list s...@caver.net http://caver.net/mailman/listinfo/swr_caver.net
[Texascavers] Re: [SWR] Martian sinkhole
On 8/18/2011 11:29 AM, Peter Jones wrote: That is cool!! Sign me up for the survey trip But be careful, Peter. It could also be the home of the endangered Giant Martian Ant-Lion. When you repel in, take some bear spray.! Lee Skinner - Visit our website: http://texascavers.com To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com For additional commands, e-mail: texascavers-h...@texascavers.com
[Texascavers] Re: [SWR] Martian sinkhole
On 8/18/2011 11:29 AM, Peter Jones wrote: That is cool!! Sign me up for the survey trip But be careful, Peter. It could also be the home of the endangered Giant Martian Ant-Lion. When you repel in, take some bear spray.! Lee Skinner - Visit our website: http://texascavers.com To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com For additional commands, e-mail: texascavers-h...@texascavers.com
[Texascavers] Re: [SWR] Martian sinkhole
On 8/18/2011 11:29 AM, Peter Jones wrote: That is cool!! Sign me up for the survey trip But be careful, Peter. It could also be the home of the endangered Giant Martian Ant-Lion. When you repel in, take some bear spray.! Lee Skinner - Visit our website: http://texascavers.com To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com For additional commands, e-mail: texascavers-h...@texascavers.com
