Tonight's Topic: "Let's Get Ready to RUMBLE! -- Mount St. Helens: 1980 -- Part 2"
Good morning/evening, everybody! Thank you for joining us tonight.
We hope you'll discover something interesting during the time we spend together on the Insomniac Net for the next 90+ minutes.
-- The ever-delightful Shelley [KF7TBA] and just plain old LW [K7LWA] (email K7LWA.INS@gmail.com).
(Please Note: The Net Controller's Answers are always CORRECT (even if they aren't every time!)
Please check out Winsystem's Insomniac Trivia Net page.
You can get these Questions & Answers at the Yahoo-groups' Messages Link.
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The trivia topic of our 12th Insomniac-Net of 2015 -- on March 20th -- was: "Let's Get Ready to RUMBLE! -- Mount St. Helens: 1980 -- Part 1".
Tonight -- to mark the 35th Anniversary of Mount St. Helens' eruption next Monday -- we will once again be asking 3 questions about the eruption that occurred on May 18, 1980.
On that morning, a magnitude 5.1 earthquake (less than a mile below the volcano) triggered a landslide on the bulging northern face of Mount St. Helens.
That landslide -- the largest terrestrial landslide in recorded history -- reduced the summit by 1,300 feet (or about a 1/4 mile of mountaintop).
That was followed by a lateral blast, ash eruption and fallout (called a "vertical eruption plume" soaring up 15 miles within the first 15 minutes), pyroclastic flows (intensely swift and hot mixtures of ash, pumice, rock-fragments, and gas), and lahars (also known as "debris mudflows").
Mount St Helens erupted 6 more times in 1980 and sporadically through 1986, during which lava oozed out on the crater floor and began rebuilding the volcano's summit.
During September 2004, Mount St. Helens re-awakened and continued to erupted for several years -- gradually rebuilding the summit (as it did many times in the past).
Accordingly, how much more do you know about... one of the most dramatic geologic moments in American History?
Please choose from any of the 3 (reuseable) answers of "A", "B", or "C" (if applicable!) for each questions listed below.
Good Luck and remember YOU are always a WINNER with us, regardless of your actual answers!
Wait, did you feel that? Oh, not to worry -- probably just Harry [ KD4JMV] driving by!
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Question #1: At 8:32 AM(PST) on Sunday, May 18, 1980, while manning the Coldwater II observation post about 5 miles north of Mount St Helens alone, USGS volcanologist David Johnston radioed in to Headquarters "Vancouver, Vancouver. This is it..." before the lateral blast (traveling up to 700 mph) eradicated him and the surrounding area for 8 to 15 miles distance. How many seconds did it take for the blast to reach David?
B. 90 seconds, or
C. 120 seconds
Question #2: The 1980-1986 and 2004-2008 eruption series added nearly 7% of the material (called "lava domes") needed to rebuild the summit to the height of the pre-1980 eruption. If these eruptions had continued, how many years would have been needed for Mount St Helens to regain those "missing" 1,300 feet of its original height?
B. about 1,000 years, or
C. about 10,000 years
Question #3: During our visit to the Cascade Volcano Observatory (CVO)'s May 2nd Open House, which activity did Shelley like the most?
B. Having a Mount St Helens "face decal" temporarily applied to her right cheek -- or was the left cheek? -- (like "face-painting"), or
C. Watching the "Trashcano" demo -- an erupting volcanco simulation using a liquid nitogen filled soda bottle and a trashcan filled with water and water-balloons -- "erupt" sending water and the balloons over 50 feet high
[SOURCE: TBA -- LW's Super-Secret MSH SToryBook]
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++ QUOTE OF THE DAY ++ -- from the USGS Cascade Volcano Observatory (CVO) reported in its CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE:
CASCADE RANGE VOLCANOES
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon. Additionally, GPS data from most of the major volcanoes, and sparse real-time hydrologic and geochemical monitoring, show no anomalous activity.
[SOURCE: CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE]Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon. Additionally, GPS data from most of the major volcanoes, and sparse real-time hydrologic and geochemical monitoring, show no anomalous activity.
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Please include you name, Callsign, and those correct answers.
Good luck everyone!
Shelley [KF7TBA] & LW [K7LWA]
K7LWA.INS@gmail.com
| NOTE:
Be sure to check out additional
info
& photos on KF7TBA+K7LWA's Friday Insomniac-Net BLOG (http://k7lwa-ins.blogspot.com/) NOTE: Blog may have Questions posted earlier than Yahoo! |
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Posted 2015-05-15 22:20PT
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