Geomagnetism – BLDGBLOG

The Magnetic Depths

The emerging sub-genre of public service announcements about geological surveys—apparently offered not just due to FAA regulations, but to quell the growth of potential conspiracy theories—continues with this heads-up about a “low-flying airplane” over parts of Virginia and North Carolina.

[Image: USGS map of eastern Virginia, altered by BLDGBLOG.]

Of course, beyond the idea of simply preempting the development of new conspiracy theories, the work being done by the project is fascinating in and of itself: “Instruments on the airplane will measure variations in the Earth’s magnetic field and natural low-level radiation created by different rock types near and up to several miles beneath the surface. This information will help researchers develop geologic maps of the area that will be used to better understand sand resources and underground faults in the region.”

While we’re on the topic of the Virginia/North Carolina border region, I’m reminded of why there’s a strange “notch” in the state line, a story “that mostly involves collecting taxes and avoiding swamps”: “The rough and rowdy inhabitants living close to the border told North Carolina tax collectors they lived in Virginia, [Gates County historian Linda Hofler] said. When the Virginia tax man came, they said North Carolina was their home.”

In any case, check out the USGS for more on the low-flying geomagnetic airplane and The Virginian-Pilot for more on VA/NC border history.

Magnetic Landscape Architecture

[Image: R. Fu, via ScienceNews].

Although I seem to be on a roll with linking to ScienceNews stories, this is too amazing to pass up: “People living at least 2,000 years ago near the Pacific Coast of what’s now Guatemala crafted massive human sculptures with magnetized foreheads, cheeks and navels. New research provides the first detailed look at how these sculpted body parts were intentionally placed within magnetic fields on large rocks.”

The magnetic fields were likely created by lightning strikes.

This is incredible: “Artisans may have held naturally magnetized mineral chunks near iron-rich, basalt boulders to find areas in the rock where magnetic forces pushed back, the scientists say in the June Journal of Archaeological Science. Predesignated parts of potbelly figures—which can stand more than 2 meters tall and weigh 10,000 kilograms or more—were then carved at those spots.”

It’s like a geological farm for the secondary effects of lightning. A lightning farm for real!

The mind boggles at the thought of magnetic landscape architecture, or magnetic masonry in ancient stonework, or even huge sculptures invisibly adhering to one another through magnetic forces, giving the appearance of magic.

Imagine a valley of exposed bedrock and boulders, its unusually high iron content making the rocks there attractive to lightning. Over tens of thousands of lightning strikes, the valley becomes partially magnetized, resulting in bizarre geological anomalies mistaken for the actions of a spirit world: small pebbles roll uphill, for example, or larger rocks inexplicably clump together in structurally precarious agglomerations. Stones perhaps hover an inch or two off the ground, pulled upward toward magnetic overhangs, or rocks visibly assemble themselves into small cairns, clicking into place one atop the other.

As you step into the valley, the only sound you hear is a trembling in the gravel ahead, as if the rocks are jostling for position. Your jewelry begins to float, pulling away from your wrists and chest.

Anyway, read more at ScienceNews.

(Also, watch for my friend Eva Barbarossa’s book on magnets coming out this fall.)

Archiving “Geomagnetic Spikes” in Everyday Objects

[Image: One of the pots; photo by Oded Lipschits, courtesy NPR].

Ancient clay pottery in the Middle East has inadvertently recorded the Earth’s magnetic field, including evidence of an “astonishing geomagnetic spike.”

“All those years ago,” NPR reported earlier this week, “as potters continued to throw clay, the molten iron that was rotating deep below them tugged at tiny bits of magnetic minerals embedded in the potters’ clay. As the jars were heated in the kiln and then subsequently cooled, those minerals swiveled and froze into place like tiny compasses, responding to the direction and strength of the Earth’s magnetic field at that very moment.”

Archaeologist Erez Ben-Yosef, one of the researchers on the project, has compared the process to a terrestrial “tape recorder,” and a particularly sensitive one at that: the resulting jars “provide an unprecedented look at the planet’s magnetic field over those six centuries, one that’s much harder to get from rocks.”

These accidental indices also indicate that the Earth’s magnetic field at the time was much stronger than expected; ominously, this “astonishing geomagnetic spike,” as mentioned above, could happen again. Indeed, the jars have “given scientists a glimpse of how intense the magnetic field can get—and the news isn’t good for a world that depends on electrical grids and high-tech devices,” Annalee Newitz writes for Ars Technica.

“The researchers note that this geomagnetic spike is similar to another that occurred in the 10th century BCE,” Newitz adds. “Data from the 10th century spike and this 8th century one indicate that such events were probably localized, not global. That said, they write that ‘the exact geographic expanse of this phenomenon has yet to be investigated, and the fact that these are very short-lived features that can be easily missed suggests that there is much more to discover.’”

This vision—of highly localized, mysterious geomagnetic storms frying electronics from below—is not only a great plot device for some burgeoning scifi novelist, it could also almost undoubtedly be weaponized: subterranean geomagnetic warfare against an entire region of the planet, short-circuiting every electrical device in sight.

[Image: One of the pots; photo by Oded Lipschits, courtesy NPR].

Of course, it’s also worth noting that this would still be happening: that is, today’s ceramics should still be “recording” the Earth’s magnetic field, even without any corresponding spike in that field’s strength. An invisible terrestrial forcefield is thus still inscribing itself inside objects in your kitchen cabinet or standing on your breakfast table. Everyday knick-knacks in retail stores around the world are still archives of planetary magnetism.

This also makes me wonder what other types of artifacts—clay figurines from nomadic Arctic tribes, mud bricks from central Africa—might also house geomagnetic records yet to be analyzed by modern technology. So what else might be discovered someday?

I’m reminded of the possibility that space weather—or “fossils of spacetime”—might be frozen into the built environment in the form of GPS glitches: hidden inside minute structural errors in large building projects, such as freeways, dams, and bridges, there might be evidence that our solar system is passing through “cosmic kinks” of dark matter.

In any case, read the original paper in PNAS; see also The New Yorker.

Village Design as Magnetic Storage Media

[Image: “Magnetic Field” by Berenice Abbott, from The Science Pictures (1958-1961)].

An interesting new paper suggests that the ritual practice of burning parts of villages to the ground in southern Africa had an unanticipated side-effect: resetting the ground’s magnetic data storage potential.

As a University of Rochester press release explains, the “villages were cleansed by burning down huts and grain bins. The burning clay floors reached a temperature in excess of 1000ºC, hot enough to erase the magnetic information stored in the magnetite and create a new record of the magnetic field strength and direction at the time of the burning.”

What this meant was that scientists could then study how the Earth’s magnetic field had changed over centuries by comparing more recent, post-fire alignments of magnetite in the ground beneath these charred building sites with older, pre-fire clay surrounding the villages.

The ground, then, is actually an archive of the Earth’s magnetic field.

If you picture this from above—perhaps illustrated as a map or floor plan—you can imagine seeing the footprint of the village itself, with little huts, buildings, and grain bins appearing simply as the outlines of open shapes.

However, within these shapes, like little windows in the surface of the planet, new magnetic alignments would begin to appear over decades as minerals in the ground slowly re-orient themselves with longterm shifts in the Earth’s magnetic field, like differently tiled geometries contrasting with the ground around them.

[Image: “Untitled” by Larry Bell (1962), via the L.A. Times].

What really blows me away here, though, is the much more abstract idea that the ground itself is a kind of reformattable magnetic data storage system. It can be reformatted and overwritten, its data wiped like a terrestrial harddrive.

While this obviously brings to mind the notion of the planetary harddrive we explored a few years ago—for what it’s worth, one of my favorite posts here—it also suggests something quite strange, which is that landscape architecture (that is, the tactical and aesthetic redesign of terrain) and strategies of data management (archiving, cryptography, inscription) might someday go hand in hand.

(Via Archaeology).

The Museum of Speculative Archaeological Devices

Perhaps a short list of speculative mechanisms for future archaeological research would be interesting to produce.

[Image: A toy antique oscilloscope by Andrew Smith, courtesy of Gadget Master and otherwise unrelated to this post].

Ground-scanners, Transparent-Earth (PDF) eyeglasses, metal detectors, 4D earth-modeling environments used to visualize abandoned settlements, and giant magnets that pull buried cities from the earth.

Autonomous LIDAR drones over the jungles of South America. Fast, cheap, and out of control portable muon arrays. Driverless ground-penetrating radar trucks roving through the British landscape.

Or we could install upside-down periscopes on the sidewalks of NYC so pedestrians can peer into subterranean infrastructure, exploring subways, cellars, and buried streams. Franchise this to London, Istanbul, and Jerusalem, scanning back and forth through ruined foundations.

Holograph-bombs—ArchaeoGrenades™—that spark into life when you throw them, World of Warcraft-style, out into the landscape, and the blue-flickering ancient walls of missing buildings come to life like an old TV channel, hazy and distorted above the ground. Mechanisms of ancient light unfold to reveal lost architecture in the earth.

[Image: An LED cube by Pic Projects, otherwise unrelated to this post].

Or there could be football-field-sized milling machines that re-cut and sculpt muddy landscapes into the cities and towns that once stood above them. A peat-bog miller. Leave it operating for several years and it reconstructs whole Iron Age villages in situ.

Simultaneous milling/scanning devices that bring into being the very structures they claim to study. Ancient fortifications 3D-printed in realtime as you scan unreachable sites beneath your city’s streets.

Deep-earth projection equipment that impregnates the earth’s crust with holograms of missing cities, outlining three-dimensional sites a mile below ground; dazed miners stumble upon the shining walls of imaginary buildings like a laser show in the rocks around them.

Or a distributed iPhone app for registering and recording previously undiscovered archaeological sites (through gravitational anomalies, perhaps, or minor compass swerves caused by old iron nails, lost swords, and medieval dining tools embedded in the ground). Like SETI, but archaeological and directed back into the earth. As Steven Glaser writes in the PDF linked above, “We can image deep space and the formation of stars, but at present we have great difficulty imaging even tens of meters into the earth. We want to develop the Hubble into, not away from, the earth.”

Artificially geomagnetized flocks of migratory birds, like “GPS pigeons,” used as distributed earth-anomaly detectors in the name of experimental archaeology.

[Image: “GPS pigeons” by Beatriz da Costa, courtesy of Pruned].

So perhaps there could be two simultaneous goals here: to produce a list of such devices—impossible tools of future excavation—but also to design a museum for housing them.

What might a museum of speculative archaeological devices look like? A Mercer Museum for experimental excavation?

(Thanks to Rob Holmes and Alex Trevi for engaging with some of these ideas over email).

Planet Harddrive

[Image: “Conceptual diagram of satellite triangulation,” courtesy of the Office of NOAA Corps Operations (ONCO)].

I’ve long been fascinated by what I might call the geological nature of harddrives – how certain mineral arrangements of metal and ferromagnetism result in our technological ability to store memories, save information, and leave previous versions of the present behind.

A harddrive would thus be a geological object as much as it is a technical one: a content-rich, heavily processed re-configuration of the earth’s surface.

[Image: Geometry in the sky. “Diagram showing conceptual photographs of how satellite versus star background would appear from three different locations on the surface of the earth,” courtesy of the Office of NOAA Corps Operations (ONCO)].

Perhaps someday we won’t need harddrives at all: we’ll simply use geology itself. In other words, what if we could manipulate the earth’s own magnetic field and thus program data into the natural energy curtains of the planet?

The earth would become a kind of spherical harddrive, with information stored in those moving webs of magnetic energy that both surround and penetrate its surface.

This extends yet further into an idea that perhaps whole planets out there, turning in space, are actually the harddrives of an intelligent species we otherwise have yet to encounter – like mnemonic Death Stars, they are spherical data-storage facilities made of content-rich bedrock – or, perhaps more interestingly, we might even yet discover, in some weird version of the future directed by James Cameron from a screenplay by Jules Verne, that the earth itself is already encoded with someone else’s data, and that, down there in crustal formations of rock, crystalline archives shimmer.

I’m reminded of a line from William S. Burroughs’s novel The Ticket That Exploded, in which we read that beneath all of this, hidden in the surface of the earth, is “a vast mineral consciousness near absolute zero thinking in slow formations of crystal.”

[Image: “An IBM HDD head resting on a disk platter,” courtesy of Wikipedia].

In any case, this all came to mind again last night when I saw an article in New Scientist about how 3D holograms might revolutionize data storage. One hologram-encoded DVD, for instance, could hold an incredible 1000GB of information.

So how would these 3D holograms be formed?

“A pair of laser beams is used to write data into discs of light-sensitive plastic, with both aiming at the same spot,” the article explains. “One beam shines continuously, while the other pulses on and off to encode patches that represent digital 0s and 1s.”

The question, then, would be whether or not you could build a geotechnical version of this, some vast and slow-moving machine – manufactured by Komatsu – that moves over exposed faces of bedrock and “encodes” that geological formation with data. You would use it to inscribe information into the planet.

To use a cheap pun, you could store terrabytes of information.

But it’d be like some new form of plowing in which the furrows you produce are not for seeds but for data. An entirely new landscape design process results: a fragment of the earth formatted to store encrypted files.

Data gardens.

They can even be read by satellite.

[Image: The “worldwide satellite triangulation camera station network,” courtesy of NOAA’s Geodesy Collection].

Like something out of H.P. Lovecraft – or the most unhinged imaginations of early European explorers – future humans will look down uneasily at the earth they walk upon, knowing that vast holograms span that rocky darkness, spun like inexplicable cobwebs through the planet.

Beneath a massive stretch of rock in the remotest state-owned corner of Nevada, top secret government holograms await their future decryption.

The planet thus becomes an archive.

(Earlier on BLDGBLOG: Geomagnetic Harddrive).

Geomagnetic harddrive

In her recent biography of Sir Christopher Wren – whose towers, domes and steeples appear in the image above – Lisa Jardine describes how she discovered that the London Monument, designed in 1677 by Wren and Robert Hooke together, is actually “a unique, hugely ambitious, vastly oversized scientific instrument” that uses “strategically placed vents and vantage points” to function as a multi-purpose observation deck and lab for measuring atmospheric pressure.

While I was living in Berlin a few years ago, it struck me once that the U-Bahn system could pass, in its own way, for a different kind of “hugely ambitious, vastly oversized scientific instrument” – before I realized, of course, that the Tube, the Metro, the NY subway, etc. – the Beijing underground, Prague, Rome and so forth – all of them could pass for such “scientific instruments.”

In other words, those buried urban routes, with all their circuits linked and cross-connected into electrically mechanized networks that passed through mineral deposits and solid bedrock – including the various branches of late-night service that maintained more or less perpetual motion, humming and soaring through manmade canyons beneath parks and plazas and apartment blocks, as if to imply that the global geotechnical industry had been taken over by Athanasius Kircher –

I realized that, in all that tumult of foundations and energy, you could, if you wanted to, listen for the subtle, cello-like moan of distant trains; and it occurred to me that the whole system, the entirety of the Berlin U-Bahn, could pass for a working model of the universe. A sonic model, at the very least, of the so-called Cosmic Microwave Background Radiation. A vaulted hum, reverbing back and through itself beneath the city.

Or – and this next idea is only slightly less ridiculous, for you cynics out there – it occurred to me that if the U-Bahn system could somehow be hooked up to massive, earth-anchored magnets, and made, therefore, to produce a magnetic field of its own, that you could transform all of Berlin into a geomagnetic harddrive.

As a sail traps the wind, a planetary harddrive would use geomagnetism.

Provided constant motion on behalf of the trains, I thought, and given absolutely gigantic magnets of the right polarity and location, Berlin could start producing its own magnetic field – which meant that any city with a subway could be transformed into a harddrive. Harddrive London. Harddrive Beijing.

Harddrive Moscow.

Of course, it’s obvious even to me that you’d have to do quite a lot more than just bury some magnets underground in order to transform a city into a harddrive – you’d need a shovel, for instance, and perhaps some strong anti-manic drugs; but my point is that if Christopher Wren could build a tower that simultaneously memorialized the Great Fire of London even as it acted as a scientific device, then perhaps you could turn urban infrastructure itself into a kind of working scientific apparatus.

You could turn all of Berlin into a geomagnetic harddrive.