Using Obspy to identify events and plot waveforms

[Alan Pointing]

Hi,

Being located in an intra-plate area, I have to make most of the larger teleseismic earthquakes occurring around the world!

Swarm is useful as an interactive tool to view the helicorder dayplot and extract a waveform to filter and try and spot the earthquake, after calculating the expected traveltime by hand. 

To automate this process, I have been using obspy (obspy.org), python and matplotlib on an Apple Mac, to automatically retrieve and plot the origin times of large magnitude earthquakes on a (filtered) helicorder plot and then extract the waveforms for these events, overlain with the expected travel times of the earthquake phases. This makes it easier to discard those earthquakes that are not quite detected on the shake.

To illustrate this, the attached python script, first shows the helicorder with earthquakes above a certain magnitude, like this:

Then for each event, it extracts and plots the filtered waveform with overlain phases, like this:

You can see that the second event (from California) is not detected.

These tools are useful for those of you that don't mind using the command line and doing some simple coding. There are quite a few examples of similar scripts on the obspy.org website, but it would be great if others can post examples they are working on, to build up a library of code for the Shake.

Thanks, Alan

  

[Branden Christensen]

Awesome contribution. Thanks Alan. 

Branden Christensen

Director, OSOP & Gempa GeoServices

Director, Raspberry Shake project

USA: +1-206-414-1288; Panamá: +507-6747-1427

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[MBorgh]

Hi Alan,

Great stuff, thanks for sharing. I had to make some minor changes to make it work on Ubuntu (yakkety, with python 2.7.12)- see the attached file.

Kind regards,

Marten

[Branden Christensen]

Hi Alan, Marten and others:

And Raspberry Shake source code collaboration was just born! 

Would it be useful for me to open a new, public git account for you guys to create new projects and share code? Source code control is useful at all levels, from when you are just toying around with a new idea or making really big cool new applications. 

Let me know your thoughts. I could have this up and ready in minutes. I would call it the "Raspberry Shake Maker Space" or something like that. GitHub or GitLab?

BTW, a new Shake came online just now in Switzerland: http://ift.tt/2oyfVat

Yours, 

Branden Christensen

Director, OSOP & Gempa GeoServices

Director, Raspberry Shake project

USA: +1-206-414-1288; Panamá: +507-6747-1427

Get yours now! Visit shop.raspberryshake.org

--

Some useful links:
 
Manual: http://manual.raspberryshake.org/
Do It YourSelf Page: http://raspberryshake.org/do-it-yourself
Shop: https://shop.raspberryshake.org/
Website: http://raspberryshake.org/
 
Instagram: https://www.instagram.com/raspberryshake/
Hashtag: #rasperryshake
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[d3noob]

 Thanks Alan, Marten and Branden,

+1 from me and a vote for GitHub!

Malcolm

[Alan Pointing]

Great idea Branden, setting something up on Github gets my vote.

Thanks, Alan

[Branden Christensen]

Good morning all.

The GitHub Raspberry Shake Maker Space is up and running and ready for collaboration: https://github.com/Raspberry-Shake-Maker-Space

Yours, 

Branden Christensen

Director, OSOP & Gempa GeoServices

Director, Raspberry Shake project

USA: +1-206-414-1288; Panamá: +507-6747-1427

Get yours now! Visit shop.raspberryshake.org

On Mon, Apr 3, 2017 at 1:30 AM, 'Alan Pointing' via RaspberryShake <raspber...@googlegroups.com> wrote:

Great idea Branden, setting something up on Github gets my vote.

Thanks, Alan

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Some useful links:

Manual: http://manual.raspberryshake.org/
Do It YourSelf Page: http://raspberryshake.org/do-it-yourself
Shop: https://shop.raspberryshake.org/
Website: http://raspberryshake.org/

Instagram: https://www.instagram.com/raspberryshake/
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[Branden Christensen]

GitHub organization path updated to: https://github.com/raspishake

Branden