According to Swedish and Danish seismographic data, the two underwater leaks that began on Monday were likely caused by underwater explosions.
The director of the Swedish National Seismic Network told NPR in a phone interview that the blasts are very clear from the seismic record.
These are not earthquakes and they are not underwater.
The officials in Germany and the Danes said that the sudden loss of pressure on the Nord Stream 1 and 2 lines was caused by a leak from large holes in the pipes.
Russia has cut gas deliveries in the pipes, but they were filled with natural gas when the pressure dropped.
Russian energy giant Gazprom has a controlling interest in the two pipes.
The location of the Nord Stream 1 leak is northeast of the Baltic Sea island of Bornholm, and the Nord Stream 2 leak is southeast of the island.
According to German media, it's possible that the leaks are the result of an act of sabotage, as it's extremely rare for undersea, concrete-coated steel pipes to break on their own.
All shipping has been stopped around the leaks.
Lund says the Swedish network picked up the explosions on Monday.
The first explosion happened at 2:03 a.
There was an explosion at 7:44 p.
He says that preliminary estimates say that this is at least 100 kilograms of dynamite.
Lund says the second leak was pinpointed by the data from the first blast, which was within a few kilometers of the Swedish Maritime Authority's location.
He says that they're not spot on, but they're close to the leak.
Lund says the second leak was pinpointed by the data from the first blast, which was within a few kilometers of the Swedish Maritime Authority's location.
Lund says there's no natural event that could have created such signatures less than 24 hours apart.
There's nothing I could come up with to make this happen.
The network has detected similar events in the past when the Swedish navy has conducted training using depth charges and underwater mines.
Lund told the Swedish armed forces of his findings, but they did not respond to NPR's email request for comment.
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