This is an image of the computer recording "drum" that shows four events recorded on the same day at my station in Denver, CO; two in Mexico and two on the opposite side of the world in Sumatra. The vertical short-period instrument that recorded these events can be made in a home shop.

Smart phone "earthquake" apps that use the built-in screen-tilt accelerometers can only detect gross movements that can be felt. The seismometer in this Instructable can detect ground motion of less than 50 microns/sec. (a human hair is about 100 microns), way below what can be felt or seen. This makes it sensitive enough to detect earthquakes from anywhere in the world greater than magnitude 6.5 and much smaller for closer events. Yet, mechanical and electronic filtering limits local signal noise.

Step 1: Comparison With Professional Instrument

This instrument rivals those of the USGS Mobile Seismic Array if placed in a suitably quiet and environmentally stable location like a basement and you will be able to gather data in the background through a USB port using free software that requires very few cpu resources while performing other tasks on your computer.

Note that like the professional instrument it nicely differentiates between Primary and Secondary body waves as well as the larger surface (L) waves allowing distance to an event and even magnitude to be accurately measured.
<p>The MAX420CPA op-amp is no longer available. Can you suggest an alternate part?</p>
<p>Try this site</p><p><a href="https://www.utsource.net/MAX420CPA.html?adgroupid=10565656054&keyword=max420cpa&adposition=1o1&gclid=COqJ47bp7NECFYS1wAodygII4A" rel="nofollow">https://www.utsource.net/MAX420CPA.html?adgroupid=...</a></p>
<p>Hello, </p><p>I've tried to make the +12/-12v power supply circuit, but my 7812s keep burning up. </p><p>Anyone experience this? </p>
<p><a href="https://hackaday.io/project/7231/gallery#98ed110580326d3ddf869b84760c085f" rel="nofollow">https://hackaday.io/project/7231/gallery#98ed11058...</a> is another seismometer project with clear build instructions. It is much more sensitive than Lehman seismometers and it is a 3D velocity vector device based on piezoelectric sensors, a charge amplifier and Arduino processsors (Mega initially, now YUN for webserver ability). It's output is magnitude, direction and statistical analysis of the magnitude and location of seismic noise. Click on the picture below.</p>
<p>Still waiting for you to post a seismogram. do you have any?</p>
<p>In case you didnt, realize, he commented back 6 months ago but to the parent comment, not your request. Check the comments to the parent comment to see the seismogram</p>
<p>Thanks I did see his tracing. Not sure what it is. Not an earthquake. I would like to see a complete recording of an earthquake to convince me that his setup is a sensitive as he claims. </p>
Can you post an earthquake tracing recorded with it!<br>
<p>Sure! There was a microseismic event near Knoxville in the early morning hours of Jan 30. The first picture is the USGS seismometer reading (about 7 miles from my device) and the second picture is the device output. The green line is the vector magnitude of the seismic noise and the blue line is the noise statistics. The third graph is a polar plot of vector magnitude on compass direction, where 0 = North.</p>
<p>Very impressive!</p><p>By any chance, is it possible to collect the datas as csv files? </p><p>I'm looking a way to retrieve earthquakes datas to draw them with servomotors.</p>
<p>sorry for the delay. Not sure about file type, but if you connect your computer's USB port to a digital to analog converter you can send stored data to an old strip chart recorder. I have done it. </p>
Should I put it underground? Also really think of using a pi and writing my own code.
The most thermally stable place and as far away from foot traffic as possible is best. Underground is not necessary.
<p>Outstanding instructable! I had gathered the parts for the Lehman and Shackleford-Gunderson seismometers before moving to un-ideal, geologically speaking, Houston. Especially since I live about a 1 mile from the busy 24/7 14 lane I-10! Still like to follow seismic projects. </p>
<p> Mechanical, electronic and software filtering should take care of the traffic noise. It could be a lot closer and you wouldn't notice it in the tracing. Keep me posted and let me know if you have questions.</p>
<p>Anyone out there using Linux Distributions for the software for this unit? I am currently running Linux Ubuntu 14.04LTS and intend to stay with it. </p>
<p>hi is there any way to don't make the amp or buy it because I don't know how to make the amp and why we should use amp in this device </p>
<p>Very cool stuff. I'm also of the opinion that an Arduino could make <br>some improvements on the electronics side of the project. Capable of <br>low-power long-term logging to an SD card, and A/D up to 10 bits without much expensive hardware (other than the amplifier). A/D converter modules aren't too expensive to increase the resolution, I found a 24bit dual-channel A/D module on ebay for $6 US.</p><p>The Arduino software for datalogging to an SD card is already everywhere. I might even add a &quot;run-length-encoding&quot; compression to allow the log to cover longer periods. Could be done, might lower cost a lot. I'll have to do more digging.</p><p>And just for clarification, your pickup coil is 1 3/4&quot; thick from outer edge to spool core? How much magnet wire is that?</p>
<p>Thanks Alderin. I don't really have experience with arduino, but there is no reason why it won't work. I would avoid 10 bit resolution and keep in mind that any design needs to have a low pass filter and should have a comutating auto zero (CAZ) function (see step 13). There is a link to magnet wire in step 7. Item 9 on that list should do the job (30 gauge, 1606 ft.) </p>
<p>will the a/d converter work on windows 8 or 8.1?</p>
<p>I don't know but I don't see why not. It is read through a USB port. Go to DataQ's website and see what you can find out. </p><p>http://www.dataq.com/</p>
Here is a &quot;Great&quot; Earthquake I just recorded on 2013-05-23 using the seismometer described in this Instructable <br>Mag. 8.3 Sea of Okhotsk SW of Esso Russia. <br>54.874&deg;N 153.280&deg;E depth = 608.9km (378.4mi)
That is so cool. Thanks for sharing. Man, you have some patience. Great Job. thanks again.
Nice 'ible. Looks a lot like a Scientific American project from about 1957 but of course back then no A/D converters or USB interface. It would be nice to use Aduino with a TCP/IP net sheild and get remote data downloads so you coul put this way away from man made activity. My $0.02 worth.
Re: Scientific American Article, see my exchange with joen below. I would love to see someone (you?) give the Aduino idea a try.
this is one amazing instructable, an example how project should be documented. don't hink i will build one soon but still must thank you...
Below is an extra Instructable 3 month Pro membership. <br>First come, first serve. <br>redeem it here: https://www.instructables.com/go/pro?code=involved11rocky <br>Your gift code: involved11rocky <br>
Do you record any false readings from large trucks, mowing the lawn or just walking about the house?
The raw data can be filtered on three levels. <br>The mechanical unit itself is tuned to relatively low frequency waves, the electronics have built-in filtering and the software can further filter the digital data. Having said that, it is best to have the unit in a quiet, thermally stable location at least six feet away from any foot traffic. Road traffic does not seem to be a significant issue. You are always going to get some &quot;microseisms&quot;, but these are usually caused by the normal moans and groans of the earth, strong winds and even ocean storms causing large wave crashes on the coastline believe it or not.
Is the magnet holder for the magnetic damper attached to the base in any way or is it just sitting there the base unattached? This instructable reminds me of a column that appeared many years ago in Scientific American magazine called &quot;The Amateur Scientist&quot; where Martin Gardner presented many science projects like this in various fields of science. <br>Well done!
Yep! Good memory. The Scientific America Article featured Jim Lehman's horizontal long-period design in 1981 which I made and it is still running.<br>The magnetic damper just sits on the base so that it can be moved in and out of the blade easily for damping adjustment.
Well... maybe my memory isn't so good after all. Martin Gardner wrote the column &quot;Mathematical Games&quot; for Scientific American. &quot;The Amateur Scientist&quot; was written by several writers including C. L. Stong, Jearl Walker and others. I remember the article you mentioned which prompted my comment. Wow! Your original setup is still running 30+ years later! Have you had to redo or repair worn parts or electronics? Wonder if this one will last another 30+ years.
I ran the Lehman seismometer at my school for my students for 25 years. We recorded hundreds of events including the Loma Prieta (World Series) earthquake. <br>I made sure that my students were well versed in seismology. A seismogram is worth a thousand words :) <br>
What an outstanding project! Like all good instruments, you have to spend some amount of money on it, but I am really impressed at how inexpensive it is. There's a part that I think I must have missed, though. How do you calibrate the amplitude? <br> <br>One minor criticism -- you refer to &quot;acceleration&quot; of 50 um/s. Either you meant &quot;ground motion&quot; or &quot;velocity&quot;, or you missed out a &quot;<sup>2</sup>&quot; on your units.
Amplitude calibration can be done using the AS-1 software with the data from the lift test if you know the mass of the filecard cutout and the distance from the hinge when it is lifted off the arm. A more practical way to do it is to graph the p-wave amplitude of your trace against the reported magnitude of the earthquake. There are a lot of variables in extracting magnitude from a single seismometer. The USGS collects data from hundreds of seismometers and feeds it into a super computer at the Earthquake Information Center on the Campus of the Colorado School of Mines in Golden, Co. <br>Regarding your acceleration correction, you are of course correct and I will update the page. Thanks for your input. Always appreciated.
Ah, thank you! That first sentence answered my question. The lift test, with a known load, gives you the vertical scale.<br><br>Of course, you can't properly get an earthquake magnitude out of a single seismometer trace, unless you just happen to have been sitting at the epicenter (and your collapsing house didn't break the instrument :-). You need to know the distance to the hypocenter, you need to know something about the different formations the waves traversed, and so on. <br><br>With a sufficently large number of stations, over a large enough area, you can not only solve for the magnitude, but you can even invert the transport problem and derive the internal structure of the Earth from the pattern of signals.<br><br>(Yes, it's clear you already know that stuff! I'm writing for the same reason you did -- for the benefit of anyone else reading this.)
Thanks kelseymh. Yes seismic tomography I think it is called. As you probably know, moment magnitude is used today which is based on the seismic moment, a function of the surface area of the slippage interface, the distance it slips and the rigidity of the rock involved. I also have a horizontal long-period unit running simultaneously that gives me two legs of an x,y,z monitoring station that would allow me to not only determine distance, but direction as well. Sigh! So little time, so much to do.
Outstanding project. I need this to monitor my neighbors' activities.
I always love real science projects.

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