New HNET article in Seismological Research Letters!

The article “Background Seismicity Monitoring to Prepare for Large‐Scale CO2 Storage Offshore Norway” was published in Seismological Research Letters 22 November 2022.

Since 2018, the Horda Network (HNET) project has evaluated different passive monitoring strategies to investigate the background seismicity in the Horda platform prior to CO2 injection startup in 2024. The main objective is to obtain a better understanding of the past and present crustal seismicity (5–15 km depth), to be able to recognize any possible changes in the rate and state of seismic activity at the startup or during the CO2 injection.

One of the main challenges in monitoring offshore earthquakes in the Norwegian continental shelf (NCS) is the lack of azimuthal coverage when using the onshore permanent seismic stations. To improve the azimuthal coverage, HNET has integrated a limited number of offshore geophones and nine-element onshore array of broadband seismometers (HNAR). By incorporating array processing methods on HNAR, the signal-to-noise ratio is improved, and several previously uncataloged earthquakes could be detected.

Read the article from Zoya Zarifi and her research partners here:

Background Seismicity Monitoring to Prepare for Large‐Scale CO2 Storage Offshore Norway | Seismological Research Letters | GeoScienceWorld

Seismicity in the Horda platform and surrounding areas (southwest coast of Norway). Sorce: Zarifi et al. 2022.