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Posts Tagged ‘LOM Geophones’

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At the end of July, a seismic period began on the Reykjanes peninsula, which ended with a volcanic eruption in Meradalar south of Reykjavík, not far from the place that last erupted in Fagradalsfjall during the COVID period.
I recorded for a few days during the earthquakes. Both with microphones and simultaneously with Geophones on four channels. After I had set up the microphones, the big quake stopped, but I did catch one that was 4.8 on magnitude.
When it started to erupt in Meradalir, the seismic activity stopped almost completely.
I took advantage of the weekend for a cycle trip to the eruption site and recorded approx. four hours of material. It was not easy. There was a lot of gas pollution and wind that are always characteristic of volcanic eruptions, but tourists and drones in the area never shut up.
I didn’t have a gas mask, which made the situation almost unbearable these four hours. It was therefore also impossible for me to record in places where other visitors could not reach.
I had my second best microphones for this project. It was my parallel MKH8020/8040 rig that gave me a lot of options to record a difficult and different subject. The attached recording is a small composite story of the events of the last few days, starting with an earthquake that then leads to a volcanic eruption.
The earthquake was recorded on four channels with two NT2a in MS configuration and two LOM geophones fixed in X/Y axis in my garage.
The eruption was recorded in AB40 on four channels with parallel MKH8020/8040 mic rig.
In post-processing, 8020 was used for the low frequency and 8040 was used for the higher frequency, which significantly reduced the noise from tourists and wind noise without losing the low frequency which in some places sounded more like a shock waves from the crater.
The recording of the eruption is from three places at the eruption site. You can actually hear it when I move the microphones once.
Then, unfortunately, drones and airplanes can be heard.
During the eruption, sounds are heard that would be worth explaining. There is a lot of all kinds of white noise, which mainly comes from glowing slag that splashes in all directions when it falls to the ground around the crater. It was also interesting to hear when it rained on the lava, an unusually loud white noise filled the air. It may be heard for a while in this recording.
Quality open headphones are recommended while listening at mid volume.
Be careful, this recording starts quietly. But most of it is pretty loud, especially at lower frequencies.
If the media player doesn’t start to play, please reload this individual blog in a new tab or frame.

(mp3 256 kbps / 65,2Mb)

Recorder: Sound Devices MixPre6
Mics: Rode NT2a in MS & LOM geophones in X/Y axis (earth quakes) and parallel MKH8020/8040 in AB40 (eruption site)
Pix: Canon EOS-M50

Weather: Wind 2-4m/sec, drizzle rain, foggy & 5-8°C
(but on the recording site, gust up to 20m/sec and 15-35°C )
Location: 63.900428, -22.246934
Eruption site on Map.is

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I have recorded various things with LOM geophones. Including electricity pylons as well as other steel structures as for example around the Hellisheidi geothermal power plant.
All these steel structures can sound extremely different, even between different types of electricity pylons. It was also interesting to hear various ambient sounds through the steel, such as birdsong, traffic and spoken words. Wind and rain is also audible through the steel
What you hear in the recording below is a very simple mix of different sources of two electricity pylons which I recorded close to Búrfell power station..
Quality open headphones are recommended while listening at mid.
If the media player doesn’t start to play, please reload this individual blog in a new tab or frame.

  (20Mb mp3 / 256kbps)

Recorder: Sound devices MixPre6
Mics. Two LOM geophones.
Pix: Canon EOS-R

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