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 March 2007

John or Jan Lahr
2007-03-27 19:36:46
Seismographs in Schools Community If you're going to the NSTA meeting in St. Louis this week, be sure to stop by the IRIS booth. Also, on Saturday, come to the workshop on Seismographs in Schools. Explore classroom uses for a simple seismograph and learn how to obtain your own for free! Teachers already running seismographs can discuss technical questions with visiting seismologists! For more details, time, and location, see: <http://jclahr.com/science/earth_science/nsta_2007/index.html> ... [more]
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John or Jan Lahr
2007-03-26 06:17:05
The record from 3/25/2007 provide a good example of why I like to run AmaSeis with a filter turned on for the helicorder display. The resulting seismogram, with enhanced low frequency sensitivity, shows the surface waves more clearly, while the higher frequency P waves are still quite visible. See this page for a comparison of my record with and without the filter turned on. http://jclahr.com/science/psn/as1/filtering/ John #################################/ John C. Lahr ##########... [more]
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John or Jan Lahr
2007-03-26 01:07:28
The record from 3/25/2007 provide a good example of why I like to run AmaSeis with a filter turned on for the helicorder display. The resulting seismogram, with enhanced low frequency sensitivity, shows the surface waves more clearly, while the higher frequency P waves are still quite visible. See this page for a comparison of my record with and without the filter turned on. John #################################/ John C. Lahr ################################/ Emeritus Seismologist ... [more]
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ChrisAtUpw@aol.com
2007-03-25 19:17:15
In a message dated 25/03/2007, AlanJones@stny.rr.com writes: Last night there were two earthquakes in the Pacific two and a half minutes apart. One was: _25-MAR-2007 00:40:02_ (http://www.iris.edu/cgi-bin/wilberII_EnO_page4.pl?evname=20070325_004002.7.spyder) -20.60 169.41 7.2 35.0 VANUATU ISLANDS and the other near Japan: 25-MAR-2007 00:41:57 37.27 136.60 6.7 5.0 NEAR WEST COAST OF HONSHU, JAPAN This will make the records merged but since the Vanuatu Islands is larger, it should... [more]
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Alan Jones
2007-03-25 16:39:41
Last night there were two earthquakes in the Pacific two and a half minutes apart. One was: 25-MAR-2007 00:40:02 -20.60 169.41 7.2 35.0 VANUATU ISLANDS and the other near Japan: 25-MAR-2007 00:41:57 37.27 136.60 6.7 5.0 NEAR WEST COAST OF HONSHU, JAPAN This will make the records merged but since the Vanuatu Islands is larger, it should dominate. I haven't examined the records yet but it should be interesting. Alan
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Alan Jones
2007-03-15 23:31:38
When I sent this note on March 12, I hadn't realized that the earthquakes were about a month out of date. I contacted Andrew Rogers who is in charge and he fixed the problem. So you can see them as they appear in time. Click on the arrow at the top of the screen. It is easier to see the time arrow if you blow away the CBS News logo. You do that on the left by clicking "Logos and trademarks." At one time you could see a ShakeMap for any earthquake but I can't seem to get that to work so I have... [more]
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Alan Jones
2007-03-13 19:21:00
Go to http://jclahr.com/science/psn/as1/heli/allas1.php to see the Baja 5.5 earthquake on most of the school displays. Alan
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John or Jan Lahr
2007-03-13 06:47:44
AmaSeis figures out GMT from the PC clock, assuming that the Time Zone of the PC is set correctly. The date and time properties on my office WinXP PC say GMT-8, the box is checked for "adjust clock for daylight savings changes," and the time changed correctly and automatically on March 11. However, for Win98 and earlier Microsoft does not supply an easy fix that I know about. Here are some options: Set the clock to standard time, do not check the box for "adjust clock for daylight savi... [more]
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Alan Jones
2007-03-12 15:15:27 - 2007-03-12 23:38:04
Last year I worked with CBS News, Google Earth, and a programmer, Andrew Rogers, who works for Neopolitan a company associated with Google. The result is now available. You first have to install Google Earth (http://earth.google.com) which is free. Then click on: http://seismic.cbsnews.google.neopolitan.com/cbs/earthquake_public.kml If you don't see earthquakes at first, go to the top of the screen and click on the right-end of the time arrow to make them appear in time sequence. Alan
Replies
ChrisAtUpw@aol.com
2007-03-12 19:21:42
In a message dated 2007/03/12, AlanJones@stny.rr.com writes: > Last year I worked with CBS News, Google Earth, and a programmer, Andrew > Rogers. You first have to install Google Earth (http://earth.google.com) which > is free. Then click on: > > ">http://seismic.cbsnews.google.neopolitan.com/cbs/earthquake_public.kml > > If you don't see earthquakes at first, go to the top of the screen and click > on the right-end of the time arrow to make them appear in time sequence. Hi there, ... [more]
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