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 April 2007

hall@scieds.com
2007-04-09 03:02:05
RANONGGA, Solomon Islands (AFP) - The seismic jolt that unleashed the deadly Solomons tsunami this week lifted an entire island metres out of the sea, destroying some of the world's most pristine coral reefs. In an instant, the grinding of the Earth's tectonic plates in the 8.0magnitude earthquake Monday forced the island of Ranongga up three metres (10 foot). Submerged reefs that once attracted scuba divers from around the globe lie exposed and dying after the quake raised the mountainous... [more]
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The M8.1 April 1, 2007 Solomon Islands earthquake provides a good opportunity to calculate the MS magnitude from your AS-1 seismogram. Or, use the WLIN seismogram (shown in the attachment and available for download at SpiNet, http://www.scieds.com/spinet/). If your station is in the western US, an mb magnitude can also be calculated. For central and eastern US stations, the first arrival is P-diffracted (see map of theoretical travel times at: http://neic.usgs.gov/neis/eq_depot/2007... [more]
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John or Jan Lahr
2007-04-05 03:28:12
Apparently Alan's site is blocked by some school filters! If so, you can see Alan's records on this page as well. http://jclahr.com/science/psn/as1/filtering/index.html Cheers, John At 08:46 AM 4/4/2007, you wrote: >Earlier John Lahr showed how filtering can make it easy to detect >earthquakes. Here's another example. > >Check out the two images. They show three earthquakes in the last 24 hours. > ><http://home.stny.rr.com/alanjones/ASNoFilter.jpg>http://home.stny.rr.com/alanjones/ASNoF... [more]
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Craig Messerman
2007-04-04 17:17:15 - 2007-04-05 03:22:52
We picked up the surface waves from one of these, and I was remarking this morning that to see a low 6 from that distance it must be the filters. Very good. Unfortunately, Alan's site is blocked by our school's internet filter. Geology is obsene to some...;) Craig Messerman Sentinel High School, Missoula, Montana >>> "Alan Jones" <AlanJones@stny.rr.com> 04/04/07 09:46AM >>> Earlier John Lahr showed how filtering can make it easy to detect earthquakes. Here's another example. Check out th... [more]
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Alan Jones
2007-04-04 18:46:57
Earlier John Lahr showed how filtering can make it easy to detect earthquakes. Here's another example. Check out the two images. They show three earthquakes in the last 24 hours. http://home.stny.rr.com/alanjones/ASNoFilter.jpg http://home.stny.rr.com/alanjones/ASFilter.jpg The filtering is the same as John Lahr commonly uses. You can hardly see the earthquakes until you turn on the filtering. This is cool. I was able to do this from home because of a beta version of AmaSeis I am using. T... [more]
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A large earthquake occured in the South Pacific. The IRIS Educational record pages show it as the waves are coming in now. Alan ----- Original Message ----- From: USGS ENS To: AlanJones@stny.rr.com Sent: Sunday, April 01, 2007 5:09 PM Subject: 2007-04-01 20:39 (Mw 7.6) SOLOMON ISLANDS -8.5 156.9 == PRELIMINARY EARTHQUAKE REPORT == ***This event supersedes event AT00209039. Region: SOLOMON ISLANDS Geographic coordinates: 8.474S, 156... [more]
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