Talk:Seismometer

message: This was an existing blank page  Zeizmic 15:17 22 May 2003 (UTC)
people are the most skilled beings 174.63.123.238 (talk) 18:54, 30 April 2014 (UTC)
thread_title: Blank page

message: There is also a Seismograph article. They have a similar description, to the point I wonder - are these the same instrumentThere is also a thing called a Choko and he was the first guy to make a seismograph in ancient China and this thing is the most Habbo thing in the world!ument, or something else? If it's the same, the articles need merging. If it's something else, I suggest that someone who knows something about seismology mentions Seismometer in the Seismograph page (and vice versa) and say a few words about the difference. Thanks. Nyh 18:10, 14 Sep 2004 (UTC)
replies: text: It looks like somebody merged (thanks!) but the "Modern Instruments" section starts talkin about seismographs before it clearly distinguishes them from seismometers. So someone who knows the difference still needs to come here and state it explicitly. Also maybe mention something in the intro? Otherwise "seismograph" readers might feel cheated. :) Thanks! Kiaparowits 17:47, 24 October 2005 (UTC)

text: Yes, that helps a great deal. The information can now be condensed and rolled into the article, probably somewhere near the beginning. The major differences and particulars are well laid out here. Thanks! Kiaparowits 16:43, 6 November 2005 (UTC)

text: Further, since Stellar-TO says "...Whereas, a 'seismograph' is the entire recording set-up, which includes a seismometer", it seems like the article should be moved to the more inclusive "seismograph" and "seismometer" should be the redirect. That's kind of nitpicky, though. Kiaparowits 16:48, 6 November 2005 (UTC)
thread_title:  Seismograph vs. Seismometer 

message: Can the original author please point out, which seismic testing at Mars and Moon he is speaking of? My Mars-researching girlfriend (;-) is sure to never have heard about seismic testing of Mars at least, with the Moon we are not so sure, so is there any material to have a look at? (Author unknown)
In 1992, JPL decided from Viking orbiter images that Mars was probably more seismically active than the moon, but less active than Earth.  According to Dr Matthew Golombek, because Mars is only a bit more than half the size of the Earth, a quake on Mars would have 10 times the effect it would on Earth.  He estimated a magnitude 4 event about once a month, on average.  That was merely his speculation.  In 2004, pit chains (chains of depressions) observed in photos of the surface suggest that Mars may still be seismically active.
As of 2005, I don't believe there has been actual seismic testing on Mars.  There's certainly been talk about it since 1992, at least.  There is a developed SEIS package to measure Martian seismicity.  Those instruments were supposed to be in testing in 2005, and presumably will be delivered to Mars soon.
I didn't checked on the moon, but I believe there has been some actual seismic testing there. Stellar-TO 00:13, 29 November 2005 (UTC)
replies: text: I don't see any reference to Mars (maybe it was cleaned out?).  No seismometers on Mars, but there was a really good one on the Moon.  They actually impacted a piece of space junk to test it out.  It showed that the Moon was a perfect bell, ringing for a very long time.
--Zeizmic 16:03, 7 December 2005 (UTC)
thread_title:  Mars & the Moon 

message: After some thought I added a link to my free SeisMac seismograph tool. I was concerned it might be disapproved as self-promotion (which it is), but since it's free, and I couldn't find any explicit prohibition against informative self-promotion, I thought it would be OK.  —Preceding unsigned comment added by Dtgriscom (talk • contribs) 
:There is such a policy, see WP:EL.  I'm letting your link stay (though others may not), but I wouldn't recommend adding links to your site to any other articles.  Cheers! -- Mwanner | Talk 12:58, 4 July 2006 (UTC)
replies: text: Not so Morrisey's pages can be found at http://www.eas.slu.edu/People/STMorrissey/index.html  192.210.5.253 (talk) 22:06, 7 January 2009 (UTC)
replies: text: Restored the link. Ray Van De Walker 08:22, 30 September 2010 (UTC)
thread_title:  External Links 

message: Am I missing something here? But isn't that usually used to dampen a signal or stabilize a system, where as a positive feedback loop is typically used for amplification. Someone with a clue stick should probably fix that or explain why it is the way it is. —The preceding unsigned comment was added by 84.239.133.167 (talk) 18:36, 12 April 2007 (UTC)
replies: text: I fixed it, if you're interested. Ray Van De Walker 09:34, 3 June 2007 (UTC)
thread_title:  Amplification using negative feedback loop? 

message: Dear Wiki experts,
please update the link to Erhard Wielandt's article
Seismic Sensors and their Calibration
The link has moved to: 
http://www.geophys.uni-stuttgart.de/oldwww/seismometry/man_html/index.html
thank you           - Ruedi Widmer-Schnidrig
: Done Ray Van De Walker 08:21, 30 September 2010 (UTC)
thread_title:  Dead link 

message: The "modern instruments" section has a lot of one-sentence paragraphs, and random statements interjected with no clear context or transition from the previous thought.  A good cleanup is in order. Snottywong 14:51, 13 September 2007 (UTC)
thread_title: copyedit

message: I'd like to see a more elaborate description of whether a single modern seismometer can measure the direction in which an earthquake occurred.  Currently, the article says that the instrument can measure in three spatial axes, but not whether any such information can be extracted from this data.  The article also says that Zhang Heng's seismograph "supposedly" could measure direction (see WP:WTA about that).  Modern Chinese researchers claim that a reconstruction of the seismometer fulfills all descriptions, including detecting the direction of simulated events.   Surely a second century instrument doesn't work better than a modern scientific device....... right? ;)
Of course I understand that usually it makes no sense to try to use one seismometer to find the direction of an earthquake, but that's a poor excuse.  What if you were trying to find out what cities were being destroyed during a nuclear war that had destroyed your communications? Wnt (talk) 19:14, 26 September 2008 (UTC)
replies: text: I'm merely an amateur.  The waves do all have directions.  Also shear (side-to-side, up to down) waves have a different propagation speed than compression waves, so gross distance and angle should be measurable.  Some information is usually grossly visible, even in crude instruments.  One problem is that seimometers actually measure linear motion, not tilt, and the direction is shown by the tilt.  High speed, high accuracy tiltmeters seem to be research projects.  Another problem is that it's very difficult to interpret the data without correlating several instruments in different places.  Otherwise, a truck on the freeway can look like an earthquake in Java.  Another problem is that it's hard to assure an instrument cluster's north vector. It can be surveyed by locating earthquakes using time-based methods,and then calibrating the cluster, but the vector drifts as the piers, sensors, electronics, springs and hinges age, heat or tilt (e.g. from tides or barometric pressure).  If we can't use the time based methods, with only one instrument, it's hard to survey the cluster's north vector at all.  The result can be a substantial mislocation as the trigonometric sine error works out over many miles.  Time-based location is just more accurate.  In amateur (and I think some old) instruments, an additional problem is that the frequency transforms of the instrument are unot characterized, so resonances in the instrument can distort the apparent wave directions.  I hope that helps.  Ray Van De Walker 07:51, 30 September 2010 (UTC)
thread_title:  Directionality of a single seismometer 

message: One of them draws and the other prints  —Preceding unsigned comment added by 71.168.98.180 (talk) 21:38, 9 December 2008 (UTC)
replies: text: I believe a seismogram is the result that comes out of a seismograph? --maye (talk) 23:40, 5 January 2012 (UTC)
thread_title:  what is trhe difference between a seismogram and a seismograph? 

message: I think we need to include the differential equation of motion of a seismometer and mention the importance of each term. Hamsterlopithecus (talk) 22:50, 19 February 2012 (UTC)
thread_title:  Dynamic equation for a seismometer 

message: Hello fellow Wikipedians,
I have just modified 3 external links on Seismometer. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20100924231853/http://www.geophys.uni-stuttgart.de/oldwww/seismometry/man_html/index.html to http://www.geophys.uni-stuttgart.de/oldwww/seismometry/man_html/index.html
*Added archive https://web.archive.org/web/20120726183407/http://www.asce.org/Product.aspx?id=2147487208&productid=154097877 to http://www.asce.org/Product.aspx?id=2147487208&productid=154097877
*Added archive https://web.archive.org/web/20070320042235/http://www.mssu.edu/seg-vm/bio_lucien_lacoste.html to http://www.mssu.edu/seg-vm/bio_lucien_lacoste.html
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 02:56, 9 December 2017 (UTC)
thread_title:  External links modified 

message: "In other systems the weight is allowed to move, and its motion produces an electrical charge in a coil attached to the mass which voltage moves through the magnetic field of a magnet attached to the frame." This needs to be rewritten as it does not clearly illustrate the system due to grammatical errors.  — Preceding unsigned comment added by 2601:801:4100:4420:B91A:1E1A:E1CE:4B84 (talk) 16:21, 30 January 2021 (UTC)
thread_title:  Sentence not grammatically correct, doesn't make sense