2015[12]A -- Ins-Net As for Mar 20, 2015_"Mount St. Helens: 1980 -- Part 1" [A-B-B]

Insomniac-Net ANSWERS -- Friday[12], Mar 20, 2015 [ A - B - B ]
Tonight's Topic: "Let's Get Ready to RUMBLE! --  Mount St. Helens: 1980 -- Part 1"
ANSWERS = [ A - B - B ]
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        -- The ever-delightful Shelley [KF7TBA] and just plain old LW [K7LWA] (email K7LWA.INS@gmail.com).
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    On March 20, 1980 -- 35 years ago today -- the eruptive activity of Mount St. Helens began with an intensifying swarm of earthquakes.
    At 3:47PM, an earthquake occurred that was the strongest in this part of the Washington Cascade Range since 1974.
    Mount St. Helens, the most active volcano (in the last 12,000 years) of the Washington Cascades, eventually erupted on May 18, 1980.        
    For tonight, our three questions concern this geological event of recent United States history.
    Accordingly, how much do you know about... Mount St. Helens -- 1980?
    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!
    Oh, by the wait, Happy Spring!

    ++ "Let's Get Ready to RUMBLE! --  Mount St. Helens: 1980 -- Part 1" ++    
Question #1: At 3:47 PM PST on March 20, 1980, an earthquake beneath Mount St. Helens marked the first strong quake of an earthquake swarm that preceded the lateral blast and cataclysmic eruption of May 18. What was the magnitude of this earthquake?
        A. 4.2, or
        B. 5.6, or
        C. 6.1

 Question #2: How many seismic monitoring stations were located on Mount St. Helens on this day -- 35 years ago?

        A. 0, or
        B. 1, or
        C. 3

The 1980 activity of Mount St. Helens began on March 20 with an intensifying swarm of earthquakes.  The first steam-blast eruption occurred a week later, with high levels of seismic activity, formation of a summit crater, and deformation of the north flank of the volcano. This continued, up to the climactic eruption on the morning of May 18.
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Mar 20, 1980. At the University of Washington seismology laboratory in Seattle, the pen scratched left, then right, each stroke swinging wider on the drum. There’s been an earthquake, fairly large, maybe at Mount St. Helens. There’s only one seismic station at Mount St. Helens (SHW) (Q2) so it isn’t easy to verify. After additional analysis, the scientists conclude the earthquake struck just before 3:48 pm, a magnitude 4.2,(Q1) the strongest in this part of the Cascade Range in 16 years. It is very shallow, plotting only a mile deep beneath the north brow of Mount St. Helens.  Seismologists had noticed small earthquakes in the area from March 15–March 20. Are these tectonic quakes—the little pops and pings of the North American plate as it is squeezed, stretched, and torqued? Or is it volcanic in nature?
[SOURCE: (email (03-19-2015) from Liz Westby, U.S. Geological Survey, Cascades Volcano Observatory]

Question #3: Prior to 1980, how many years had Mount St. Helens been dormant (i.e., having no major eruptions)?
        A. 66 years (1914), or
        B. 123 years (1857), or
        C.  5600 years (3620 BC)

07—March 20, 1980—A magnitude 4.2 earthquake signaled the reawakening of the volcano after 123 years.
[SOURCE: U.S. Geological Survey General Information Product 103: 30 Cool Facts about Mount St. Helens]

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++ QUOTE OF THE DAY ++  -- from the Preface of the USGS report on the 1980 Mount St. Helens eruption, the editors stated:
    "The reawakening of Mount St. Helens volcano in March 1980, and its catastrophic eruption of May 18, surely will rank among the most significant geologic events in the United States in the 20th century".   [SOURCE: USGS-PP-1250]

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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!

Next Week: "The ABEL PRIZE"
Next, Next Week: WYHearIWYG!
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Thank you!
Shelley [KF7TBA] & LW [K7LWA]
K7LWA.INS@gmail.com
Posted 2015-03-21 02:00PT
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