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Posts Tagged ‘Earthquake’

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Earthquakes have shaken southwestern Iceland for more than two weeks. They have been counted in many thousands since it began so folks like me are going to feel like all earthquakes below 4 in magnitude are a normal state
But not everyone feels the same way. All those who live close to the source of the earthquakes are going to be very tired of this situation, mainly inhabitants of Grindavík town and nearby places.
When I was working on this blog as an example, an earthquake hit my house which was 5.4 magnitude. It is similar in magnitude as those which first heard in the recording below.
The following earthquakes were recorded in my garage in Reykjavik which is 25-30Km from the earthquake’s source.
The first two earthquakes were recorded with parallel Nevaton MC59O & MC59C, on four channels in  AB40 setup. All other earthquakes were recorded using the Nevaton MC50Quad in MS setup. These Nevaton microphones are the only ones I have that can reach below 10Hz and can therefore also record the fluctuations in the aftershocks.
This recording contains sixteen earthquakes, collected from continuous one week long recording. They are mainly earthquakes which happen during the nighttime to avoid traffic noise. Most of them were above 3 magnitude…I guess.  

(mp3 256Kbps / 24,4Mb)

Quality open headphones are recommended while listening at mid level.
If the media player doesn’t start to play, please reload this individual blog in new tab or frame

Recorder: Sound devices 788
Mics: Nevaton MC59O & MC59C parallel in AB setup and MC50 Quad
Pix: Screenshot of the first two earthquakes in the recording

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Hér er á ferð samantekt af fimm hljóðritum sem tekin voru upp 3. apríl 2011 þegar ég og vinnufélagi minn Haukur Guðmundsson fórum dagsferð um Reykjanesið.
Byrjað var á því að fara að Kleifarvatni þar sem farið var að hverum sem komu upp á yfirborðið eftir jarðskjálftana árið 2000 þegar lækkaði skyndilega í vatninu. Ekki var þorandi að fara mjög nærri, því allt eins var víst að maður stigi fætinum í sjóðandi sandpytt.
Hljóðritið byrjar á þessum hver. Eftir það eru tvo hljóðrit frá Seltúnhverum. Við eftirvinnslu þeirra hljóðrita kom í ljós að önnur upptakan skilaði einhverjum titringi inn á hljóðritið sem erfitt var að skilja nema um jarðskjálfta hafi verið að ræða. Titringur þessi var á u.þ.b. 10 riðum. Ekki er vitað á hvaða styrk en væntanlega undir 3 á Richter.
Frá Seltúnshverum lá leiðinn eftir Suðurstarandavegi um Grindavík vestur að Gunnuhver sem fyrir okkur báðum var orðin ógnvænleg hrollvekja. Hvorugur okkar hafði farið þessa leið í langan tíma, en báðir mundum við eftir þessum hver sem litlu svæði sem gufa lagði upp frá. Nú var þetta orðið gríðar stórt svæði þar sem allt sauð og blés eins og í helvíti á jörð, gersamlega óþekkjanlegt. Það er ekki að furða þó jarðfræðingar séu á tánum yfir þessu skrímsli sem Gunnuhver er orðinn í dag. Myndavélin varð óvirk í eiturgufunum og ég var logandi hræddur um að þvælast með upptökutækin í þessum ætandi gufum. Aðeins ein upptaka náðist af þessum stað þar sem hljóðnemum var vísað í holu í útjaðri hverasvæðisins. Er það fjórði hverinn í hljóðritinu .
Frá Gunnuhver lá leiðin að framhjá Reykjanesvita niður í fjöru við Valahnjúka þar sem síðasta hljóðritið var tekið upp.

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Earthquake at Seltúnshver (Geothermal area)

It was in the beginning of mars, earthquake hit my house.
Almost nonstop earthquakes shakes landscapes south and east of Reykjavik capital so I was sure my recorder had picked up some earthquakes previous years. I searched in my mind where it was most likely it could have happened. After some research I found one, in almost forgotten recording. It was recorded in april 2011, when I and my pal at work went a day trip to Reykjanes peninsula. Reykjanes is very well known for earthquakes and geothermal activity. The main reason for this trip was to look at the changes of some geothermal area because of increasing activity last decade. As usual, my recorders followed me in this trip, but I was not satisfied with these recordings…until now.
Hereby I mix together five of these recordings as a travel log for this day trip.
First one is a hot spring that for centuries has been under water in Kleifarvatn Lake until the lake started to shrink after big earthquake at the year 2000.
The second one is also a hot spring recording but it contains the earthquake at very low frequency (10Hz). The third one is another hot springs close by, but with different mics and they did not detect earthquake as clearly. Both this recordings are recoded at Seltúnshver (Seltúns-hver=Seltuns-hotspring).
The fourth one was recorded at Gunnuhver close to Reykjanesvirkjun, a power plant that has changes a lot the geothermal activity on Reykjanes peninsula.
The fifth recording is waves of Atlantic Ocean hammering the cliffs at Reykanestá.

Download mp3 file (192kbps / 22Mb)

The earthquake. Speed up version about 2x octave of the second recording above (Almost 3 minutes shrink to 37 sek). Subwoofer or quality headphones recommended

Download mp3 file (192kbps / 0,9Mb)

Recorders: Korg MR1000 and Sound devices 552
Mics: Rode NT4 (XY) and Rode NT2a/Sennheiser ME64 (MS)
Pix: Canon 30D (see more pictures and information)

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