home page
Posts by old_user17525

Posts by old_user17525

1) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 36870)
Posted 6 May 2009 by Profile old_user17525
QCN has caught a number of quakes over the last few weeks:

-M4.2 Quake San Jose --- March 30, 2009
-M6.3 quake in Central Italy --- April 6th 2009
-M5.1 quake in Hawaii --- April 21, 2009
-M4.0 earthquake in Yorba Linda, California --- April 24, 2009
-M4.5 earthquake in Southwest Germany --- May 5, 2009

QCN has also now moved out of Alpha testing.
2) Message boards : Number crunching : Climate Prediction CPU (coprocessor) -- am I the only person doing this research? (Message 36026)
Posted 26 Jan 2009 by Profile old_user17525
It is suggested that you avail yourself of the long standing documentation about this Project so that you will know what you are talking about.

I suspect he already has given the content of his paper, he just hasn\'t acknowledged his debt to those who have already done a lot of the hard work, referenced any of their work, or given credit where it\'s due.
3) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 36011)
Posted 25 Jan 2009 by Profile old_user17525
A paper about Quake-Catcher Network appeared in Seismological Research Letters, Jan/Feb 2009.

The Quake-Catcher Network: Citizen Science Expanding Seismic Horizons

The Quake-Catcher Network (QCN) is a seismic network that implements distributed/volunteer computing with the potential to provide critical earthquake information by filling in the gaps between traditional seismic stations. Microelectromechanical systems (MEMS) sensors detect vibrations within the frequency range of local seismic waves (0.1–20 Hz), so any internet-connected computer with an internal or external MEMS accelerometer can become a strong-motion seismic station. The QCN, a distributed computing project, uses idle computer cycles and MEMS sensors to increase the number of seismic stations, which may soon provide faster and more accurate detection and characterization of moderate to large earthquakes. We present accelerograms and triggering analysis of an Mb 5.1 earthquake recorded by laptop MEMS accelerometers during early testing of the QCN system. In addition, we present here the advantages of distributed computing and MEMS accelerometers for seismic monitoring, as well as basic triggering algorithms.

The QCN capitalizes on the main advantage of distributed computing—achieving large numbers of processors with low infrastructure costs—to provide a dense, large-scale seismic network. While MEMS accelerometers are less sensitive than typical broadband or short-period sensors, a higher number of stations is advantageous for both the study of earthquakes and, potentially, earthquake early warning (Allen and Kanamori 2003; Wurman et al. 2007). Volunteer computing reduces overhead by limiting instrument, operation, and maintenance costs associated with traditional seismic networks (Anderson et al. 2002).

( Full article available to read Here )
4) Message boards : Cafe CPDN : Galaxy Zoo (Message 35977)
Posted 20 Jan 2009 by Profile old_user17525
If anyone knows any \'A\' level students in the UK interested in Astronomy they might be interested in this.

( )

Short notice though as they need to be in touch by January 26th!
5) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 35584)
Posted 24 Nov 2008 by Profile old_user17525
The \'ScienCentral\' channel has posted a short (two minute) video-clip on youtube regarding the Quake-Catcher Network featuring an interview with Prof. Jesse Lawrence of Stanford.
6) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 35113)
Posted 27 Sep 2008 by Profile old_user17525
This week\'s issue of \'The Economist\' (Sept. 25th \'08 ) has an article on QCN written by Francois Grey of CERN. You can read it here:
7) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 34540)
Posted 6 Aug 2008 by Profile old_user17525
Quakes caught by laptop sensor

The article reports on a broadcast which went out yesterday (5th August) on a BBC world service programme called \'Digital Planet\'.

There\'s a podcast and download here: which hopefully, as its a world service programme, will be accessible everywhere (not just the UK).
If you listen to the programme the interview is about 15:30 mins in.
8) Questions and Answers : Windows : i am at the end of my days (Message 34400)
Posted 26 Jul 2008 by Profile old_user17525
Our thoughts are with you, Bob.

Life and death are one, even as the river and the sea are one.
In the depth of your hopes and desires lies your silent knowledge of the beyond;
And like seeds dreaming beneath the snow your heart dreams of spring.
Trust the dreams, for in them is hidden the gate to eternity.

Only when you drink from the river of silence shall you indeed sing.
And when you have reached the mountain top, then you shall begin to climb.
And when the earth shall claim your limbs, then shall you truly dance.

Love and peace, Marj
9) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 33989)
Posted 2 Jun 2008 by Profile old_user17525
QCN is now back to its non-cpu-intensive status so although it will use some of the cpu, it will run at the same time as other projects.
10) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 33971)
Posted 1 Jun 2008 by Profile old_user17525
An alpha version of the QCN software for Windows has been created which will work on Lenovo Thinkpad laptops.

For those running Windows who attach without a Thinkpad, the graphics display now provides real-time information from the USGS on earthquake activity around the world.
11) Message boards : Number crunching : Problems after SAP merger into CPDN (Message 33921)
Posted 26 May 2008 by Profile old_user17525
Hi, just to bring a close to this thread. I have recovered all my WU\'s from backup.
Now, when will the SAP server come back on line?

It will probably be Tuesday before its back up as its a bank holiday weekend here and they can\'t get access till tomorrow.
12) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 33894)
Posted 20 May 2008 by Profile old_user17525

The project currently seems to be using ~15-25% of the cpu when its running, so it no longer has the \'non-cpu intensive\' status unless there is more than 1 cpu.
With one cpu its now running as a \'normal\' project.
13) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 33784)
Posted 15 May 2008 by Profile old_user17525
Marj, I don\'t have a laptop - or anything else - with an accelerometer, but what a truly amazing concept! I hope they can make it work usefully.


Well, its looking good so far. They have direct matches between the seismic activity recorded on the laptops and that recorded on some of the big (and expensive) monitoring stations.
The plan for the future, which is currently under development, is to use a USB accelerometer which will just plug into a desktop PC. Not only will that mean that many more people can participate but it will also be much more stable in terms in movement etc for the seismic monitoring.
Apparently in earthquake zones even 10 secs or so warning can make a big difference, though it may not seem much it can give people time to run outside and move away from plate glass windows etc.
I\'ll post updates as they become available.
14) Message boards : Cafe CPDN : QCN (Quake Catcher Network) (Message 33777)
Posted 15 May 2008 by Profile old_user17525
Particularly appropriate at the moment with the big China earthquake although unfortunately the only China participants were too far away from the epicentre to provide any useful data.

We are happy to report that two QCN alpha test participants who live in and near Reno Nevada detected vibrations from the recent Magnitude 5.1 earthquake in Reno using QCN software. We\'re very excited and are currently preparing a paper to show these preliminary results, i.e. that the QCN software seems to detect real seismic events and report to our servers within seconds. Hopefully this is the start of a real system that can be used for advanced warning someday! We\'re also happy to report that both participants and their laptops are fine! :-)

It is a \'non-cpu-intensive\' project so can be run in parallel with other projects such as CPDN without taking CPU time away from them.
nb. qcn is still an alpha project
15) Message boards : Science : Open University free online climate change/global warming courses (Message 32454)
Posted 4 Feb 2008 by Profile old_user17525
The Open University have FREE online courses on

climate change here:

and Global Warming here:

(You don\'t need to register to access the material)
16) Message boards : Cafe CPDN : Holidays and Special Occasions (Message 31454)
Posted 22 Nov 2007 by Profile old_user17525
Happy Thanksgiving, hope you all have a good day.
17) Questions and Answers : Windows : Procedure for Installing BOINC updates (Message 31364)
Posted 14 Nov 2007 by Profile old_user17525
well in my firefox both your sigs show as the same size as the normal text AND in bold AND underlined!!

You can take a horse to water but you can\'t make it drink ;)

edit: same in IE as well.
18) Message boards : Number crunching : Missed daily trickle? (Message 31238)
Posted 1 Nov 2007 by Profile old_user17525
Hi John,

It looks like the same problem as the slabs do a final zip upload rather than a normal trickle at the end. Its these uploads which aren\'t getting through but it should resolve itself (hopefully) once the server problem is resolved.

19) Message boards : Science : BBC followup programme (Message 31155)
Posted 28 Oct 2007 by Profile old_user17525
I hope these will be of interest, particularly to our non-UK participants, who have made such a large contribution but may never have had the chance to see our \'award winners\' before (see

The original documentary which launched the Climate Change Experiment

A 3 minute prime-time News Clip featuring Nick Faull at Oxford

An 8 minute Results Programme with Sir David Attenborough
20) Message boards : Science : Climate is too complex for accurate predictions (Message 31123)
Posted 26 Oct 2007 by Profile old_user17525
I don\'t think its so much a case of just saying that we don\'t/can\'t know as recognising realistically that there are, and to some extent, will be uncertainties in the predictions we make.
Models already look at a range of different scenarios but the climate is an immensely complex system which is not static. If for example, as we hope, significant action is taken to reduce GHGs then that will alter any predictions we already have based on the current status quo. a change in one part of the system will effect other parts. The more we learn then the better chance we have. Not being able to be 100% accurate is not much of an excuse for doing nothing.

Next 20