High Strain Rate Planetary Mechanics

 About this book Read this bookJournal of the Conversations of Lord Byron: Noted During a Residence with ... By Thomas Medwin: "Who would not wish to have been born two or three centuries later said he putting into my hand an Italian letter Here is a savant of Bologna who pretends to have discovered the manner of directing balloons by mea ns of a rudder and tells me that he is ready to explain the nature of his invention to our Government I suppose we shall soon travel by air vessels make air instead of sea voyages and at length find our way to the moon in spite of the want of at mosphere Cos Mm ipsum petimtts stultitia said I There is not so much folly as you may suppose and a vast deal of poetry in the idea replied Lord Byron Where shall we set bounds to the power of steam Who shall say Thus far shall thougo and no farther We are at present in the infancy of science Do you imagine that in former stages of this planet wiser creatures than ourselves did not exist All our boasted inventions are but the shadows of what has been the dim images of the past the dream of other states of existence Might not the fable of Prometheus and his stealing the fire and of Briareus and will be destroyed, men will not tear rocks from their foundations by means of steam, and hurl mountains, as the giants are said to have done, against the flaming mass? -- and then shall have traditions of Titans again, and wars with Heaven. "

I don't know about all of you all, but I had a great class!

Thanks for your contributions. Everybody brought their own flavor of scientific enthusiasm, and you each went beyond the call of duty, into the realm of truly trying to figure something out.

I will probably teach this class every three years, perhaps evolving into a mixed lecture / seminar format. Your recommendations are welcome. And, of course, please send me any papers you think ought to be discussed in future offerings of this class.

For those intrigued and wanting lectures that encompass some of the physics we discussed, take 263 (Planetary Surfaces) in the Spring. This is a mixed class, with graduates and undergraduates, where grads have a mandatory upper-level problem session each Friday.

Have a great AGU and winter break,

Erik

As it says up there, folks. I have a meeting in Tucson Monday, so I would have to leaave class early, and also I know of a couple people who will not be back from Thanksgiving vacation yet.

Thus: next class meeting will be Friday December 1!!!

See you there on Friday.

Readings:
Gladman et al. 2005 (Hart)
Mastrapa et al. 2001 (volunteer?)
Asphaug et al. 2006 (Asphaug)
Chyba et al. 2006 (Kory?)
Saghanian et al. 1999 (Erin?)
Zhang 1999 (related to above)(volunteer?)

As it says up there, folks. I have a meeting in Tucson Monday, so I would have to leaave class early, and also I know of a couple people who will not be back from Thanksgiving vacation yet.

Thus: next class meeting will be Friday December 1!!!

See you there on Friday.

Readings:
Gladman et al. 2005 (Hart)
Mastrapa et al. 2001 (volunteer?)
Asphaug et al. 2006 (Asphaug)
Chyba et al. 2006 (Kory?)
Saghanian et al. 1999 (Erin?)
Zhang 1999 (related to above)(volunteer?)

(we'll do this some other time)

Meet at the coffee cart at 10am, on Friday, if you are interested in having some "quality time" with Emily's group, and with visiting researcher Yonggui Guo of Rice University. After grabbing their coffee at 10, these granular researchers are known to venture towards the southern courtyard of the building, out past the atrium.

Also, note that Yonggui is speaking tomorrow (Tuesday) at noon in C332 on a topic in granular physics, "The Influences of Fault Gouge on the Mechanical and Frictional Behavior of Shear Zones Using the Distinct Element Method"

Here are about 5 hours of readings for you. More if you give them a good read. Don't put it off, give yourself time to skim them, then read them, then re-skim them before class.

Some are fundamentals; others are major curiosities; all are fun!

Anybody want to claim these papers for leading discussions? 2 of them are taken (Collins and Melosh; Pope et al.), but the rest are up for grabs.

Melosh 1989 Chapter 5 (2 hour)
Collins and Melosh 2003 (1 hour)
Spray 97 (30 min)
Spray and Thompson 95 (30 min)
Pope et al. 2006 (1 hour)

The elastic modului are very temperature dependent. But I don't see any comment on this in the Aldibirov & Dingwell paper. And the tensile strength of a melt is talked about in that paper but does not appear to be defined. So, I'd like to discuss how temperature dependence will affect the analyses, and how tensile strength is arrived at for a viscoelastic fluid.

Howdy Y'all,

For Monday 23rd we are reading Campbell 2006 and Takahashi 1981. These are kind of lengthy papers so don't leave them to Sunday night! (Campbell 2006 is the published version, provided by Cathy, of Campbell 2005).

I have incorporated the above and some new readings into the zipped archives. Go get 'em as usual: ftp topaz.pmc.ucsc.edu, anon, ftp4u, cd pub, get *.zip

In "Keepers.zip" you will find Campbell 2006 and the following readings provided by Darcy, whose suggestions for the Oct 30th readings are excellent. In addition we will revisit Melosh 2005 SiO2 ANEOS if Craig is back then.

"Hi, Erik. I've attached three papers--

1.) Alidibirov & Dingwell on decompression rates and magma fragmentation

2.) A Kieffer paper describing volcanic jets (similar to the Satellites paper but not exactly that one since I don't have it)

3.) Kieffer describing plume simulations on Mars, Earth, Venus.

My suggestion is for class to read Adibirov & Dingwell, Kieffer 1984 on Jets, and Ken's paper. In the "extra reading" put the 1995 Kieffer simulations paper, as it's tangential to what we're talking about in class.

This can take us nicely through a selection of strain rate dependent processes in volcanism--

The A&D paper presents the issue of rate dependent magma behavior, a nice example of strain rates and conduit behavior. Kieffer 1984 presents what is effectively a fluid dynamics treatment of rate dependent flow of a mixture of rock and gas. Ken's paper covers a variety of rate dependent issues after this high speed flow surges laterally above ground.

It's important to note that these papers are not a representative slice of physical volcanology papers. They are simply some examples of rate dependence in some volcanological phenomena.

Darcy"

Craig won't be able to make it to lead the Melosh 2006 MAPS discussion.

Any takers? When Craig gets back he'll be able to show some of the phase behavior of ANEOS, so it can be a partial discussion for now, and more later.

Erik

p.s. If I recall correctly Cathy is leading Melosh 2003, Shawn is leading Housen and Holsapple 1999, Nancy is leading Melosh Chapter 3, and Don is leading Melosh equation of state appendix... But unfortunately I forgot to write this down, so please comment to this entry if I got this wrong!!