Velocipede Rider
International Degrowth Network
WeAreSeismicaThe city vibrates:
Köhler et al. combine an urban sensor network in Oslo and machine learning to reveal ground shaking produced by construction blasts.
Read more: https://doi.org/10.26443/seismica.v3i1.1166
#Olso #Norway #urbanseismology #Seismology #EarthquakeScience #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience
Monitoring urban construction and quarry blasts with low-cost seismic sensors and deep learning tools in the city of Oslo, Norway
The aim of this study is to collect information about events in the city of Oslo, Norway, that produce a seismic signature. In particular, we focus on blasts from the ongoing construction of tunnels and under-ground water storage facilities under populated areas in Oslo. We use seismic data recorded simultaneously on up to 11 Raspberry Shake sensors deployed between 2021 and 2023 to quickly detect, locate, and classify urban seismic events. We present a deep learning approach to first identify rare events and then to build an automatic classifier from those templates. For the first step, we employ an outlier detection method using auto-encoders trained on continuous background noise. We detect events using an STA/LTA trigger and apply the auto-encoder to those. Badly reconstructed signals are identified as outliers and subsequently located using their surface wave (Rg) signatures on the seismic network. In a second step, we train a supervised classifier using a Convolutional Neural Network to detect events similar to the identified blast signals. Our results show that up to 87% of about 1,900 confirmed blasts are detected and locatable in challenging background noise conditions. We demonstrate that a city can be monitored automatically and continuously for explosion events, which allows implementing an alert system for future smart city solutions.
CdrikEn complément des saunas, voici les #piscines dans le fjord ! Ouvertes toute l'année et surveillées l'été jusqu'à 22h !
Rappel : elles ne sont pas chauffées !
#Olso #NoFilter
Rappel : elles ne sont pas chauffées !
#Olso #NoFilter
This could be #Olso in the future, with some hipster cycling through Grünerløkka.
Eve19925
Commissioner for Human RightsIn #Olso today at the panel organised by the Helsinki Committee in partnership with Nobel Peace Centre with representatives of the #NobelPeacePrize laureates, I stressed the importance of solidarity with and among #humanrightsdefenders, in particular those from Russia, Belarus and Ukraine.
Read my speech👉http://bit.ly/3uDwPaF
Victor VenemaDer #Olso #Omikron Ausbruch waren geimpft und vorher getestet Leute.* Das sind die NRW regeln für #Karneval.
Wir sind jetzt in Deutschland bei etwa 2% Omikron. Es verdoppelt bei den jetzigen Maßnahmen etwa jede Woche.** Also nächste Woche 4%, danach 8%, 16, 32%, 64%, ...
In etwa einem Monate werden wir es also in den Fallzahlen sehen. Könnten wir, wie bei der ersten Welle, vielleicht vorher reagieren?
** In anderen Länder wo es fast keine Maßnahmen gibt schneller.
Oslo-Ausbruch als Vorbote, was uns in Deutschland mit Omikron bevorsteht
Erschreckende Erkenntnisse nach einem Omikron-Ausbruch in einem Osloer Restaurant: Fast alle Teilnehmer waren doppelt geimpft, trotzdem infizierten sich 74 Prozent der Teilnehmer mit der Omikron-Variante. Auch die Symptome fielen kaum milder aus. Was bedeutet das für uns?