Posted on 10/02/2004 1:36:54 PM PDT by nwctwx
Edited on 10/02/2004 1:43:12 PM PDT by Admin Moderator. [history]
St. Helens is a Plinian type stratovolcano volcano, right?
Plinian (or Vesuvian) eruptions typify the well-known historic eruptions that produce powerful convecting plumes of ash ascending up to 45 kilometers into the stratosphere. These explosive eruption types are named after Pliny the Younger, a Roman statesman who wrote a remarkably objective account of the eruption of Italy's Mt. Vesuvius (left) in 79 AD. Pliny's uncle, Caius Plinius (Pliny the Elder), was a much respected naturalist and Admiral in the Roman navy who died during the eruption. To properly record the circumstances of his esteemed uncle's death, Pliny the Younger wrote two letters to the historian Tactius describing the Mt. Vesuvius eruption. The eruption killed thousands of people and buried the Roman towns of Pompeii and Herculaneum under huge volumes of tephra, pyroclastic flows, and lahars. Pompeii laid buried for over 1700 years until it was rediscovered by accident during the excavation of a water line. Uncovering the remains of Pompeii has not only broadened our understanding of Plinian-type eruptions, but it has also provided a unique understanding of the lives of ordinary people during Roman times.
Stratovolcano Base diameter up to 10s of km, height up to 4-5 km; slope 15° to 33°. Constructed from andesite lava flows and pyroclastic deposits; composite. Long-lived: Typically active for 10,000 to 100,000 years. Example: Mt. St. Helens, Mt. Fuji, Vesuvius
Sorry it happened to you too, but I'm always glad to hear that it wasn't something I did:)
I am not in the Cascades, but I am on the tallest piece of granite in the lower 48.
I think they maybe cut the live feed off or something. I hope it comes back.
Awesome pic! So where did the first burp blow through, at the south end of the lava dome?
Wow, talk about before and after.
OK.... Maybe just you.... ;-)
Pinging you to post 170...this will make you drool!
You pinged Godzilla?
HE'S probably the one who STARTED this.
Recent Mount St. Helens Earthquakes
Last updated Sat Oct 2 16:54:14 PDT 2004
Number of well-located earthquakes in current month = 645
List and Map of 20 most recent earthquakes:
(Note: Times are in GMT => subtract 8 hours to get PST,
7 hours to get PDT)
DATE-(UTC)-TIME LAT(N) LON(W) DEP MAG QUAL COMMENTS
yy/mm/dd hh:mm:ss deg. deg. km Ml
04/10/02 08:43:11 46.20N 122.18W 0.0 2.0 AB
04/10/02 09:20:51 46.19N 122.19W 0.0 1.3 AB
04/10/02 09:31:49 46.19N 122.18W 1.1 2.3 AB
04/10/02 09:52:39 46.19N 122.18W 1.7 1.6 AB
04/10/02 09:54:48 46.19N 122.18W 1.7 2.3 AB
04/10/02 11:02:16 46.19N 122.18W 1.4 2.4 AB
04/10/02 11:54:54 46.19N 122.18W 0.0 2.2 AB
04/10/02 19:11:19 46.19N 122.18W 1.4 2.3 AA LOWF
04/10/02 20:25:01 46.19N 122.19W 1.4 1.0 AB
04/10/02 20:42:18 46.19N 122.18W 1.1 2.8 BA
04/10/02 20:57:10 46.19N 122.19W 1.3 2.1 AA
04/10/02 21:08:02 46.19N 122.19W 1.3 3.0 AA
04/10/02 21:38:11 46.19N 122.19W 1.2 3.2 BA
04/10/02 21:43:48 46.20N 122.19W 0.0 3.1 BA
04/10/02 21:51:07 46.19N 122.18W 1.0 2.3 AA
04/10/02 21:59:32 46.19N 122.19W 1.6 2.2 AA LOWF
04/10/02 22:02:36 46.19N 122.18W 1.1 3.1 AA
04/10/02 22:12:31 46.19N 122.18W 1.3 2.2 AA
04/10/02 22:14:48 46.19N 122.19W 0.9 2.8 AA
04/10/02 22:17:52 46.20N 122.19W 1.8 3.1 BA
It's in Washington, but we here in Oregon stand to collect a goodly share of the ashfall.
This will warm the cockles of his heart (doesn't it warm yours?)
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