I have reactivated my LoRaWAN development system consisting of an IMST Lite Gateway with the ChirpStack Gateway-OS installed and an Arduino MKR WAN 1310. It's perfect for quick development and testing of LoRaWAN nodes for data acquistion.


I have added a short review of the M=2.4 earthquake last week recorded with the MSS network. The earthquake was most likely not felt within the region of the MSS network. The epicenter was slightly outside of the MSS network region. In the video on the review post you can see the seismic waves passing the network.


I'm currently working on a tutorial and the documentation of my seismological prototyping software psysmon (github.com/stefanmaar/psysmon). It is written in Python and it is free software. Any seismologist or geoscientist motivated for testing or even contributing?

Screenprinting solder paste, placing the SMD components and reflow soldering using my DIY setup. The outcome is very satisfying.

Finished two Ruwai Power Supply 2 shields. I'm happy that everything worked as expected.

Starting to reactivate my small DIY seismic hardware pool. I have started soldering some PCBs that have been kept on hold during the last year to finalize and upgrade some of my open hardware seismic data recorders called Ruwai.

@jayrope Reliable sources for near-realtime data from global seismic networks are ds.iris.edu/ds/nodes/dmc/servi and geofon.gfz-potsdam.de/. The data is served using the seedlink protocol. A python seedlink client is available in the obspy package ( docs.obspy.org/packages/autoge). Let me know if you need more info or support.

I'm currently switching from GNUcash to a plaintext accounting software. I'm using beancount, beancount-mode for emacs and the fava frontend. Right now I'm experimenting and learning how to use the beancount features using my last years data. It's looking promising and I can't wait to use the python API of beancount to create custom reports.


Starting the year making up a workflow for self-printed photo zines. Just got the first test run of a set of printed sheets. I'm using FOSS software only for device calibration, layout and impositioning. Only the printer software is proprietary. Unfortunately high quality printing under Linux is not yet possible with free software.

@jayrope No, I'm not using the LOM Geofon for the recording. I use dedicated seismic equipment to record the data. My focus is on the low frequent seismic wavefield which has a lot of content below 20 Hz. Although the LOM Geofon uses a seismic sensor similar to those that I'm using, I don't know how sound recorders treat the low frequencies. I guess they filter them out. From an accoustic point of view, the LOM Geofon is a very sensitive contact microphone. Let me know if you need more info

Emacs org-mode, orgparse, Jinja2 and Latex are my tools of choice to implement an intuitive text-based ERP system for my small company. Feeding data from org files to Latex templates using orgparse and the Jinja template system is working great.


My Jekyll Homepage mertl-research.at/ is available in two languages. I have written a Jekyll Plugin which allows the handling of multiple languages. I have tried the jekyll-multiple-languages-plugin first, but it contained too many monkey patches and changes of core classes. So I have written a custom plugin that uses Jekyll Hooks only.
There is no documentation yet, but you can take a look at the code on Github.


Quite exceptional seismicity happening right now in the Vienna Basin area. Just followed an earthquake almost live on our interactive map at macroseismicsensor.at/. Didn't feel this one in Vienna though. But the one, that happend the last night woke me up.

@jayrope I'm using geophones. LOM uses a similar type of sensor in their "Geofon" contact microphone. Acutally I have supported LOM selecting a suitable geophone sensor for their application.

@jayrope I have done some small things with it. Mainly C++ coding. I'd like to use it for real-time sonification of ground motion, but I didn't code much this year. Thanks for posting about bela, makes me wanna dig into it again.

After one night of computation, the output of the dense reconstruction is looking good. The next step will be to resample to a uniform sampling distance the get rid of the "shadow" effects.

After a revisit of the spot to collect images to fill some gaps, the sparse reconstruction is looking good.

The Viennese high fog has settled, so uniform light is guaranteed. I took this opportunity to take photos from St.Marx DIY, which has grown quite a lot this year. Just started the structure from motion workflow. Let's see if I have captured all important details, or if I have to revisit the site to fill in some gaps.

Skate hardware is getting rare. No more Spitfire wheels available over here. Hope to avoid flatspots for some time.

Show older

The original server operated by the Mastodon gGmbH non-profit