Old Magma Monday


Four enormous underwater volcanoes, thought to be about 50m years old, have been discovered off the coast of Sydney by a team of scientists who were looking for lobster larvae.

The volcano cluster was spotted through sonar mapping of the sea floor by Investigator, Australia’s new ocean-going research vessel, about 250km off the coast.

The four volcanoes are calderas, large bowl-shaped craters caused when a volcano erupts and the land around it collapses. The largest is 1.5km across the rim and rises 700m from the sea floor. The 20km-long volcano cluster is nearly 5km underwater.

Professor Iain Suthers, a marine biologist at the University of NSW, said the volcano discovery was made when the team was searching for nursery grounds for larval lobsters.

“My jaw just dropped,” Suthers told Guardian Australia. “I immediately said, ‘What are they doing there and why didn’t we know about them before?’ It really backs up the statement that we know more about the surface of the moon than our sea floor.



About Den

Always in search of interesting things to post. Armed with knowledge and dangerous with the ladies.
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12 Responses to Old Magma Monday

  1. Den says:

    95 degree weather heading back in this week. The RV battery went south, only 10 volts where there should be 12.5, more money exiting the wallet today. 😦


    • David B. Benson says:

      You bought the RV already?


      • Den says:

        Two weeks ago, as with everything I buy, it has issues, I can fix them but I’m getting real tired of fixing, I just want to be done with it. I have to pull the generator out, it’s got issues, I think the bad battery blew a diode in the alternator trying to charge it. Had to go to Sacramento to exchange the battery, they would not just exchange it, they had to try to charge it for four hours first even though measuring 10.5 volts signifies a bad battery, the Batteries and Bulbs bozos have their protocol. Now I have to drive back down again to get the new one later during rush hour. More stupid.


  2. David B. Benson says:

    Mostly cloudy at 75 °F.


  3. David B. Benson says:

    @ the Birch & Barley in 67 minutes via a new route: up to the top of campus, east on Grimes Way to Terre View Blvd, across the Moscow highway and back along the trail. Easy to check that the route is close to 3 miles so my pace has picked up.


    • David B. Benson says:

      From the map by the Community Gardens, closer to 3.3 miles so my pace was quite good. But coming up to Sloan after dinner took 23 minutes; slower when full.

      Statistics: 55+67+23=145 minutes on a Monday.

      Lovely day out. Right amount of sun and wind.


      • David B. Benson says:

        The whole murder of crows flew over to campus just now. The murder was over by SEL along Terre View Blvd when I went by there yesterday. There was also the largest gathering of magpies I have ever seen nearby, but not intermingled with, the crows.


  4. º¿carol says:

    Diane still here, having a nice time. Someone to talk to, friends for over 35 years. LOTS to talk about.

    Tomorrow Bob & I have an eye appointment for glasses. Diane will stay. When we get home it’s out to eat in a restaurant! WOO HOO! Someone can serve me.

    And off I run. Life will settle down commencing Thursday.


  5. David B. Benson says:

    Bought some baking soda on this evening’s trip to the grocery store.


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