[Geysers] "Beehive Doesn't Like to Erupt at Night"--Lynn Stephens

[Lucille Reilly]

Hmm, this is most interesting.

 

I was relief and night clerk at OFI in 2000, and often heard Beehive
erupting/thundering around 2:30am.

 

Thanks, Lynn.

 

Lucille Reilly

  _____  

From: geysers-bounces at lists.wallawalla.edu
[mailto:geysers-bounces at lists.wallawalla.edu] On Behalf Of Lynn Stephens
Sent: Monday, June 01, 2009 7:03 PM
To: geysers at lists.wallawalla.edu; Tara Cross
Subject: [Geysers] "Beehive Doesn't Like to Erupt at Night"--Lynn Stephens

 

THIS POST IS FOR THE PERSONAL USE OF THE SUBSCRIBERS TO THIS LISTSERV AND
MAY NOT BE REPRODUCED
FOR ANY OTHER PURPOSE.  
 
TARA--If you haven't finished the "Current Geyser Activity" column for the
June Sput, you can go ahead and insert this if you want to do so.
 

Once again, I am hearing the statements "I heard Beehive does not like to
erupt at night," and "So-and-so looked at the data and said Beehive does not
like to erupt at night."  I addressed this issue in a column in the February
2008 issue of The Sput.  Over the years there have been some years when
Beehive exhibited a strong diurnal effect and other years when it did not.

Using Ralph Taylor's electronic data for January 1 through April 22, 2009
(thank you to the Park Service for providing the monitors and to Ralph
Taylor for analyzing the temperature data to compute the eruption times),
the best 4 hour window for Beehive is between noon and 4 pm when 26% of the
eruptions occur,  9.6% more than would be expected if the eruptions were
spread evenly throughout the 4-hour blocks.  Interestingly, the 4-hour
blocks of midnight to 4 am and 4 am to 8 am each have 16.7% of the
eruptions, the same number that would be expected if eruptions were spread
evenly throughout the 4-hour blocks.  The largest deficit is in the 8 pm to
midnight block, which contains only 10.9% of the eruptions, a  5.8% deficit.
The other 4-hour blocks with deficits include 4 pm to 8 pm with a 2.6%
deficit, and the 8 am to noon block with a 1.3% deficit.  

 

Using available data to date this year, it appears that Beehive's aversion
to eruptions is late afternoon through midnight, but once the clock strikes
midnight, Beehive awakens.

 


2009 Beehive Data 1/1/ - 4/22


 

 

 

Number of eruptions

 

 

Percent of Eruptions

Percent if Eruptions were Evenly Distributed

 

 

 

Surplus/Deficit


 

 

 

 

 


Midnight to 3:59 am

 

26

 

16.67

 

16.67

 

0


4:00 am to

7:59 am

 

26

 

16.67

 

16.67

 

0


8:00 am to

11:59 am

 

24

 

15.38

 

16.67

 

-1.29


Noon to 

3:59 pm

 

41

 

26.28

 

16.67

 

+9.62


4:00 pm to

 7:59 pm

 

22

 

14.1

 

16.67

 

-2.57


8:00 pm to

11:59 pm

 

17

 

10.9

 

16.67

 

-5.77


 

 

 

 

 


Number 

156

 

 

 

 

Note, because this is just a quick note for readers of the listserv, I have
not performed any tests of statistical significance.  I'll save those for an
expanded article for either the Sput or the Transactions.

 

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