Qualla: Zuidwal Volcano https://qualla.com/zuidwal-volcano en-us © 2026 Bendyline Mon, 20 Jul 2026 10:21:34 GMT Qualla serial false Qualla support@bendyline.com yes https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/hero-small.webp Qualla: Zuidwal Volcano https://qualla.com/zuidwal-volcano Zuidwal Volcano: Introduction https://qualla.com/zuidwal-volcano/ Photo credit Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source), CC BY 3.0 nl. In 1970 a French oil-and-gas company called Elf Aquitaine was drilling test wells under the Wadden Sea, chasing a seismic survey that promised a gas field somewhere between Harlingen and Vlieland. The drill bit went down through two kilometers of Cretaceous sandstone and shale, found the gas-bearing rock the survey had predicted — and then, beneath it, hit something nobody had predicted at all. Volcanic rock. The temperature at that depth was 130 °C instead of the expected 100. The Dutch lowlands, famously placid, famously horizontal, were keeping a 160-million-year-old secret two kilometers down.

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Image: Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source) | CC BY 3.0 nl

]]> Sat, 16 May 2026 00:00:00 GMT https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/u17w-zuidwal-volcano-intro.mp3 0:06 1 full Zuidwal Volcano: A Volcano Where There Should Be None https://qualla.com/zuidwal-volcano/ Photo credit Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source), CC BY 3.0 nl. The Netherlands does not have volcanoes. It has dunes and dikes and reclaimed polder; the highest point in the entire country barely tops 300 meters. Geologically, this is a passive margin, sediment piled on sediment, ten thousand years of patient deposition. So the Zuidwal find ...

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Image: Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source) | CC BY 3.0 nl

]]> Sat, 16 May 2026 00:00:00 GMT https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/u17w-zuidwal-volcano-a-volcano-where-there-should-be-none.mp3 0:06 2 full Zuidwal Volcano: How a Volcano Lands Here https://qualla.com/zuidwal-volcano/ Photo credit Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source), CC BY 3.0 nl. Around 160 million years ago — the heart of the Jurassic, when ammonites were still common in shallow seas — pressure was building in the European basement. Far away, the Cimmerian Plate was colliding with the southern margin of Asia, a slow continental wreck that would eventuall...

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Image: Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source) | CC BY 3.0 nl

]]> Sat, 16 May 2026 00:00:00 GMT https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/u17w-zuidwal-volcano-how-a-volcano-lands-here.mp3 0:06 3 full Zuidwal Volcano: Gas in the Cap Rock https://qualla.com/zuidwal-volcano/ Photo credit Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source), CC BY 3.0 nl. What Elf Aquitaine was actually looking for, when it found the volcano, was something the volcano had helped create. Cretaceous sandstone laid down across the buried summit became excellent reservoir rock — porous, permeable, ready to hold natural gas. A layer of shale sealed it ...

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]]> Sat, 16 May 2026 00:00:00 GMT https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/u17w-zuidwal-volcano-gas-in-the-cap-rock.mp3 0:06 4 full Zuidwal Volcano: Magnetic Ghost https://qualla.com/zuidwal-volcano/ Photo credit Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source), CC BY 3.0 nl. There is one more way the volcano makes itself known. The basalt at Zuidwal is rich in magnetite, and when it cooled it locked in a magnetic signature. Today that signature shows up on regional magnetic surveys as a distinct anomaly — a red blob on the deviation map of Earth's ma...

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Image: Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source) | CC BY 3.0 nl

]]> Sat, 16 May 2026 00:00:00 GMT https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/u17w-zuidwal-volcano-magnetic-ghost.mp3 0:06 5 full Zuidwal Volcano: Above the Hidden Mountain https://qualla.com/zuidwal-volcano/ Photo credit Tijmen Stam / IIVQ - conversion from NLOG's PDF (see source), CC BY 3.0 nl. Stand on the deck of the Harlingen-to-Vlieland ferry on a flat summer afternoon. The Wadden Sea looks like brown silk pulled taut over an absolutely level world. Cormorants stand on channel markers. The wind carries the smell of salt and shellfish. Underneath, drilled wells now p...

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]]> Sat, 16 May 2026 00:00:00 GMT https://qualla.com/_m/u/1/7/w/zuidwal-volcano-wp/u17w-zuidwal-volcano-above-the-hidden-mountain.mp3 0:06 6 full