Alexa Van Eaton

@volcaniclastic

Physical volcanologist investigating explosive eruptions and volcanic lightning ⚡️. She/Her. Views my own.

Vrijeme pridruživanja: prosinac 2012.

Tweetovi

Blokirali ste korisnika/cu @volcaniclastic

Jeste li sigurni da želite vidjeti te tweetove? Time nećete deblokirati korisnika/cu @volcaniclastic

  1. Prikvačeni tweet
    13. sij

    If you're mesmerized by the steamy eruption plume and wondering why it's creating so much , you’re not alone. Here’s a micro-crash course on the physics of volcanic thunderstorms for non-specialists. Thanks to for the incredible footage! (1/14)

    Prikaži ovu nit
    Poništi
  2. 4. velj

    This sounds great, I’m totally jumping in as soon as I get a chance

    Poništi
  3. 1. velj

    Oh and the pyroclast textures are on point. Rice crispies definitely = golden pumice

    Prikaži ovu nit
    Poništi
  4. 1. velj

    Never-before-seen photo of Kīlauea’s fissure 8 lava fountain in eruption, with geophysicist, geologist, and fudgey GPS sensors for scale. Courtesy of grad student Valerie Wasser, volcano baker extraordinaire

    Prikaži ovu nit
    Poništi
  5. proslijedio/la je Tweet
    12. sij

    Phreatic eruption at Taal Volcano in the Philippines, generating lighting within the ash column. These explosions occur as magma heats surrounding ground/surface water. and for information and updates 📷: Brandenberg Milla, Domcar Lagto and Hannah Saab

    Poništi
  6. 13. sij

    Another incredible video of positive upward lightning leader, or perhaps a different view of the same flash?

    Poništi
  7. proslijedio/la je Tweet
    12. sij

    volcano eruption as of 4:02am Photo taken from tagaytay area. Pls be safe everyone🙏

    Prikaži ovu nit
    Poništi
  8. 13. sij
    Prikaži ovu nit
    Poništi
  9. 13. sij

    So keep up the great work documenting this important activity—from a safe distance. You don’t have to be close to gather valuable information. Stay safe out there! And watch as the trusted source of information—they are monitoring the situation closely. (14/14)

    Prikaži ovu nit
    Poništi
  10. 13. sij

    ...clues about the nature & movement of the charge-carries inside volcanic plumes. But we need more work to decode that story scientifically. It really helps to see photos & videos of the lightning activity, especially if there are accurate TIME STAMPS on the images. (13/14)

    Prikaži ovu nit
    Poništi
  11. 13. sij

    Another fascinating tidbit about the lightning is that we're seeing thousands of tiny flashes within the plume (as well as terrifying and hazardous cloud-to-ground strikes). This abundance of in-cloud lightning holds tantalizing clues about... (12/14)

    Prikaži ovu nit
    Poništi
  12. 13. sij

    Something to know about volcanic lightning: it is NOT RARE despite what many people will tell you. It's very common during explosive ash-producing eruptions. So common, in fact, that we use it to help monitor volcanism around the world. (11/14)

    Prikaži ovu nit
    Poništi
  13. 13. sij

    Of course this process happens *inside* the volcanic plume, but also extends from the cloud to the ground (or vice versa, as we've seen in some recent videos). These strikes are just as hazardous as lightning from regular thunderstorms. (10/14)

    Prikaži ovu nit
    Poništi
  14. 13. sij

    ...creating local electric fields so intense they overwhelm the breakdown threshold of air. A lightning leader splits the atmosphere in a flash of superhot plasma, stripping electrons from everything in its path, and (briefly) neutralizing the charge. (9/14)

    Prikaži ovu nit
    Poništi
  15. 13. sij

    Charge separation is at work in turbulent eddies, during fallout of different-sized particles with different settling speeds, and tilting of the plume due to wind shear, just to name a few. The effect is that regions of opposite electric charge start accumulating... (8/14)

    Prikaži ovu nit
    Poništi
  16. 13. sij

    Now we have highly charged particles. But you need separate regions of opposite charge (positive vs negative) to make lightning. So how does that happen? Circulation processes inside the plume isolate discrete ‘pockets’ or layers of similarly-charged particles. (7/14)

    Prikaži ovu nit
    Poništi
  17. 13. sij

    ...once the plume rises high enough to reach freezing temperatures in the cold upper atmosphere (which is ~7-9 km high over Lake Taal), all that water carried in the plume? It starts freezing to ice. When ice crystals get involved, the electrons really start flying. (6/14)

    Prikaži ovu nit
    Poništi
  18. 13. sij

    So here's where volcanic lightning comes in. Inside the lower part of this plume, ash particles are smashing violently against each other and flinging their electrons around. A static charge builds up almost immediately. And then..... (5/14)

    Prikaži ovu nit
    Poništi
  19. 13. sij

    If the plume fails to become buoyant, it may collapse downward & travel along the ground as a hot current of ash and gas known as a pyroclastic flow—these can be very deadly & are a major occurrence in Taal’s geological past according to the local experts at (4/14)

    Prikaži ovu nit
    Poništi
  20. 13. sij

    A turbulent column of volcanic ash, gas, and vaporized lake water rises up vertically—first by momentum, and then because the plume itself becomes buoyant (it’s warmer and less dense than the surrounding air). (3/14)

    Prikaži ovu nit
    Poništi
  21. 13. sij

    It starts with explosive fragmentation of hot rock under Lake Taal, which leads to vigorous magma-water interaction. This process vaporizes the lake water AND pulverizes the erupted rocks into even smaller particles known as volcanic ash. (2/14)

    Prikaži ovu nit
    Poništi

Čini se da učitavanje traje već neko vrijeme.

Twitter je možda preopterećen ili ima kratkotrajnih poteškoća u radu. Pokušajte ponovno ili potražite dodatne informacije u odjeljku Status Twittera.

    Možda bi vam se svidjelo i ovo:

    ·