Hello.
1.7.25 ca 19.31 UTC happened an meteor impact to Baltic Sea near Ahvenanmaa. There is many photos and videos of event and eaven seismic data. I trye to find it from nearby stations, like R5C18 in Sweden Norrtälje Bergsvik 1D-station. Data View: Raspberry Shake Data Visualization Tool
Is this the event? Not sure.
Same event at Tulipallojen seismologisista havainnoista | SeismoBlogi
“Eckerön asemalla mitattu pystyliikkeen voimakkuus on ensimmäisen isomman piikin kohdalla n. 90 nanometriä. Jos tulkitaan, että maanliikkeen olisikin aiheuttanut normaali maanjäristys 50 kilometrin etäisyydellä, niin tuo vastaisi voimakkuudeltaan magnitudin 2,3 järistystä. Tämän kokoisia maanjäristyksiä tapahtuu Suomessa noin kerran-pari vuodessa. Olettaen edelleen, että lähde on maanjäristys, magnitudista voi laskea energia-arvion, jolloin arvoksi saadaan 580 MJ vastaten n. 90 kiloa TNT:tä!” The possible earthquake is not at list of events in ShakeNet.
This was a fun exercise; thank you for the notification!
(and welcome back to the community!)
The closest Raspberry Shake is the one near Stockholm (R0C1F - Data View: Raspberry Shake Data Visualization Tool), as I found from online articles that the meteor exploded over or near the Åland archipelago (a beautiful place that one!).
This is also confirmed by the International Meteor Organization at this page: Fireball event
If we consider the atmospheric entry and burnout points as displayed in the map (they’ll probably be different, but it’s a good approximation), and the fact that some videos I’ve seen (many here: Taivaanvahti - Ursan havaintojärjestelmä: /observations/browse/list/6571641/#Havainnot listana) show good luminosity fluctuations (sign of not constant meteor material burnout), I think these two low-frequency signals are the best candidates for the explosion detection.
If the meteor exploded at least twice, then we could assume that both spikes are related to this event; however, I’m not entirely sure of this.
Well done. Thank you. Latest calculations takes the blue line more north, over the sea. So my canditate for best station is R5C18.
