IRIS EPO

For educators, college/university faculty and professionals interested in the instruction of seismological concepts in primary and secondary classrooms.

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Active Message Threads for November 2007

On Nov 30, 2007, at 1:15 PM, John Lahr wrote: > This must be on your DVD. Does Alan have a copy? Is that video > online as well? Yes, that's it! John, thanks for giving me the necessary clue for my aging mind :) And, Bob it's a great description of faults and tectonics using foam blocks. Here it is - http://www.iris.edu/about/ENO/aotw/archive/2/animations/ FaultModelsLecture.mov - Alan Kafka
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Hi Bob, Some time over the past week or so, I remember seeing a video distributed to the IRISED community with you describing faults and tectonics using foam blocks. It was a great presentation!!! I want to show it to my class at Boston College. But, I can't find it. Am I remembering correctly that it was your video that I am thinking of? Assuming yes: Can you (or someone else on this list) direct me to the link for that video? Thanks, - Alan Kafka Boston College
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John Lahr
2007-11-30 06:14:14
Dear Teachers: This is a notice of the earthquake that occurred today (Thursday) within the lithosphere that has been subducted beneath the eastern edge of the Caribbean plate. Due to the great depth (145 km) the surface wave are not a prominent feature of the seismogram. Rather than an attachment, I've posted the information here: http://jclahr.com/science/psn/as1/windward07/index.html This event should have been well recorded on all operating seismic systems. Cheers, John Lahr ... [more]
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Michael Breed
2007-11-29 06:26:55
Hi John, I checked the link below and I had a little trouble linking up... did anyone else? I saw the problem, though... on my e-mail browser the last "greater than" symbol is underlined and is part of the link. It shouldn't be. Just make sure the link ends in .xml and it will work. Thank you for posting the podcast to the listserv, John. I appreciate it. :) I apologize to all ahead of time for my bad pronunciation of Chilean names and a bit of ignorance on the tech specs of the ... [more]
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John Lahr
2007-11-28 19:12:06
I want to draw your attention to the podcasts that Michael Breed is generating. Michael is an Earth Science teacher in Binghamton, NY, who runs one of the IRIS AS-1 instruments. He's made podcasts on many subjects for his class (and others) to enjoy. His Episode 23 - Seismology Rocks! <http://www.cvcsd.stier.org/Podcast/mbreed/Secure/Uploads/lgdtesci.xml> is all about seismology and his AS-1. Michael describes below how to listen to his podcasts. Enjoy, John >Date: Wed, 28 Nov 2... [more]
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Craig Messerman
2007-11-17 19:39:54 - 2007-11-28 16:11:50
Very nice website! The classroom activities, while very comprehensive, are a bit too canned and touchy-feely for my tastes. I see the earthquake machine as a perfect tool for open-ended or guided inquiry. Why not guide students in collecting the data used to create animation #2 and 3? Each cm of hand motion could represent a year of time, and students could stop after each earthquake to measure block motion. Use a spring scale or force sensor to measure strain build-up and you've got huge pot... [more]
Replies
John Lahr
2007-11-23 06:13:06
I've posted instructions for setting up a seismogram as a screen saver: http://www.jclahr.com/science/psn/as1/screensaver/index.html This can be expanded to include additional stations by adding wget lines to the batch file. In fact, the image need not be a seismogram, but what could be better than a current seismogram??? Let me know if this works, or doesn't work, for you. Cheers, John
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John or Jan Lahr
2007-11-22 22:30:09
If you think the AS-1 can be tricky to run and takes up quite a bit of space, check out the instruments that Andrija Mohorovicic (1857-1936) used to discover the crust-mantle discontinuity, now call the Mohorovicic Discontinuity, or Moho for short. http://www.gfz.hr/sobe-en/seismographs.htm With masses of up to 1,200 kg (2,645 lbs), these were truly gigantic instruments! There is a good article on this important scientist in the Seismological Research Letters. It's posted here: htt... [more]
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John Lahr
2007-11-22 17:31:50
There was a relatively small earthquake well north of Corvallis on November 21, 2007. Today I decided to take a look to see if my AS-1 detected it. My results are posted here: http://jclahr.com/science/psn/as1/dalles07/index.html If you hear of an earthquake in your area, which will not be uncommon for teachers in California, the techniques that I used to enhance the signal should allow events to be studied that might otherwise have gone unnoticed. Happy Thanksgiving, John ########... [more]
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John or Jan Lahr
2007-11-20 07:58:17
At 20:32 on 11/19/2007 UT a magnitude 5.8 event occurred on the Blanco fracture zone off the coast of Oregon. Bob Butler and I have written up some information on this event and posted it here: http://jclahr.com/science/psn/as1/blanco07/index.html Cheers, John
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John Lahr
2007-11-19 06:58:08
Now that I'm home, I've moved the document describing the M7.7 Chile earthquake of November 14, 2007, to a more permanent location: http://jclahr.com/science/psn/as1/index.html#Summary I've also created a video describing the aftershock sequence from this event. This was done using the program Camtasia to capture the sequence as it was being displayed by the Seismic Eruption program: http://jclahr.com/science/psn/as1/chile07/chile2007/index.html Based on the extent of the aftershock z... [more]
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John Lahr
2007-11-16 18:23:17
Jenda Johnson has started posting an "Animation of the Week" from the growing collection of video clips and animations that she has created. See: http://www.iris.edu/about/ENO/aotw/ This week's animations and clips describe the block-and-sandpaper model and show how it can be used to teach the concept of "elastic rebound." In addition to geology and tectonics, earthquakes can provide a useful context for teaching or reviewing many basic physics concepts, such as sliding and static ... [more]
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John Lahr
2007-11-15 06:18:49
I've added a two figures to a short note written by Robert Butler on the M7.7 Chile earthquake of November 14, 2007. The MS Word version is: http://jclahr.com/science/psn/as1/heli/chile77.doc . The HTML version is; http://jclahr.com/science/psn/as1/heli/chile77.html Yours, John Lahr #################################/ John C. Lahr ################################/ Emeritus Seismologist ###############################/ U.S. Geological Survey ==========================/ Central Region Ge... [more]
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John Lahr
2007-11-14 23:44:02
>I don't think I have my seismograph calibrated correctly. Most of >the time I have tiny little movement up and down, so it looks like >the lines are kind of fuzzy. In Kansas, on a concrete floor, this >probably makes sense. But when I extract part of a line to look >more closely, the peaks and valleys are square, not pointed. This >doesn't make sense to me. Sometimes it appears that there is no >movement at all, and when a segment is extracted it shows wider squares. > >Also, I t... [more]
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