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Seismo-acoustic observations from the 26 September 2022 Nord Stream events

Description: 

In this study, seismic and infrasound signals from two seismic events coincident with media reported leaks from the Nord Stream gas pipelines in the western Baltic Sea are analysed. Seismic signals from the events in September 2022 were recorded on local and regional distance seismic networks, and arrival times are used to estimate precise epicentres for both events. Seismic signals from the first event are characteristic of a shallow source, and observed modulations in the spectra, which are assumed to be caused by reverberations in the water column, suggest both events occurred near to the seafloor. Signals from the two events are also compared with those recorded for other nearby historic seismic disturbances and using estimates of the local seismic magnitudes, estimates of the trinitrotoluene (TNT) equivalent charge weight for each event were obtained. Following both events, a long duration coda in the seismic data is observed which is too long to be from a single explosive source. Infrasound signals recorded at two International Monitoring System infrasound stations are associated with the events. The observed infrasound signals are also longer duration than would be expected from a single explosive source and show similarities with those observed from underwater volcano eruptions and gas pipeline explosions.

Session: Detecting, Locating, Characterizing and Monitoring Non-earthquake Seismoacoustic Sources [Poster]

Type: Poster

Date: 4/19/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Ross Heyburn

Student Presenter: No

Invited Presentation: 

Authors