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Date: 15 Oct 2006 19:48:36
From: mcltunes
Subject: Hawaiian Earthquake -- Twin Keck's Survive?
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Does anyone have any first hand experience with the Kecks and know if
they were affected at all by the earthquake? Thanks in advance...
-- Mark
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Date: 15 Oct 2006 20:29:31
From: Starlord
Subject: Re: Hawaiian Earthquake -- Twin Keck's Survive?
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Being the center of the quake was off shore and deep, I would thing that the
mountain they are on would have buffered the shaking a lot. Only thing that
gets me is most quakes come from the new island that's southeast of the big
island and will not brake surface for another 1,000+ Years. I ;ived in
Honolulu for a number of years, once while living in a high rise about 73,
we had a small quake hit Oahu and as I was laying on the couch, I watched
the view of the lani go up and down for about 3 mins. I lived in a high rise
called KPT and was state housing.
Wonder if a new magma chanber has opened under the big island.
--
The Lone Sidewalk Astronomer of Rosamond
Telescope Buyers FAQ
http://home.inreach.com/starlord
Sidewalk Astronomy
www.sidewalkastronomy.info
The Church of Eternity
http://home.inreach.com/starlord/church/Eternity.html
"mcltunes" <webmaster@mcltunes.com > wrote in message
news:1160966916.199400.320550@b28g2000cwb.googlegroups.com...
> Does anyone have any first hand experience with the Kecks and know if
> they were affected at all by the earthquake? Thanks in advance...
>
> -- Mark
>
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Date: 16 Oct 2006 00:51:11
From: George
Subject: Re: Hawaiian Earthquake -- Twin Keck's Survive?
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"Starlord" <starlord@sidewalkastronomy.info > wrote in message
news:2NidnQgv-atBYa_YnZ2dnUVZ_vydnZ2d@inreach.com...
> Being the center of the quake was off shore and deep, I would thing that
> the mountain they are on would have buffered the shaking a lot. Only
> thing that gets me is most quakes come from the new island that's
> southeast of the big island and will not brake surface for another 1,000+
> Years. I ;ived in Honolulu for a number of years, once while living in a
> high rise about 73, we had a small quake hit Oahu and as I was laying on
> the couch, I watched the view of the lani go up and down for about 3
> mins. I lived in a high rise called KPT and was state housing.
>
> Wonder if a new magma chanber has opened under the big island.
This quake was tectonic, not volcanic. The Harvard CMT shows that it was a
predominantly dip-slip event, and occurred in an area that has seen large
quakes in the past. If it was strongly felt in Oahu, 140 miles away,
chances are it was felt on the summit of Mauna Loa as well. But don't take
my word on that. Maybe those who work on the summit can chime in on the
matter for the rest of us.
George
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Date: 17 Oct 2006 04:01:30
From: Skywise
Subject: Re: Hawaiian Earthquake -- Twin Keck's Survive?
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"mcltunes" <webmaster@mcltunes.com > wrote in news:1160966916.199400.320550
@b28g2000cwb.googlegroups.com:
> Does anyone have any first hand experience with the Kecks and know if
> they were affected at all by the earthquake? Thanks in advance...
>
> -- Mark
sci.astro added
After reading your post I contacted the PIO at the Keck observatory.
She said the mirrors appear to be fine, as are spare segments and
the instruments. But the quake did cause the scopes to move in their
mounts and there is damage to the precision reference marks.
They now have a quake update page on their site with more information.
http://www.keckobservatory.org/article.php?id=95
Brian
--
http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html
Quake "predictions": http://www.skywise711.com/quakes/EQDB/index.html
Sed quis custodiet ipsos Custodes?
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Date: 17 Oct 2006 03:39:55
From: George
Subject: Re: Hawaiian Earthquake -- Twin Keck's Survive?
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"Skywise" <into@oblivion.nothing.com > wrote in message
news:12j8lcq4g7eik5b@corp.supernews.com...
> "mcltunes" <webmaster@mcltunes.com> wrote in
> news:1160966916.199400.320550
> @b28g2000cwb.googlegroups.com:
>
>> Does anyone have any first hand experience with the Kecks and know if
>> they were affected at all by the earthquake? Thanks in advance...
>>
>> -- Mark
>
> sci.astro added
>
> After reading your post I contacted the PIO at the Keck observatory.
> She said the mirrors appear to be fine, as are spare segments and
> the instruments. But the quake did cause the scopes to move in their
> mounts and there is damage to the precision reference marks.
>
> They now have a quake update page on their site with more information.
>
> http://www.keckobservatory.org/article.php?id=95
>
> Brian
> --
> http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
> Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html
> Quake "predictions": http://www.skywise711.com/quakes/EQDB/index.html
> Sed quis custodiet ipsos Custodes?
Thanks for the update, Brian. It's good to know that these marvelous
instruments made it through ok.
George
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Date: 17 Oct 2006 01:37:27
From: John Ladasky
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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Starlord wrote:
> Being the center of the quake was off shore and deep, I would thing that the
> mountain they are on would have buffered the shaking a lot.
It wasn't that far off-shore, just a few miles. It was a deep quake,
though -- 24 miles down.
http://earthquake.usgs.gov/eqcenter/eqinthenews/2006/ustwbh/
> Only thing that
> gets me is most quakes come from the new island that's southeast of the big
> island and will not brake surface for another 1,000+ Years. I ;ived in
> Honolulu for a number of years, once while living in a high rise about 73,
> we had a small quake hit Oahu and as I was laying on the couch, I watched
> the view of the lani go up and down for about 3 mins. I lived in a high rise
> called KPT and was state housing.
>
> Wonder if a new magma chanber has opened under the big island.
It wouldn't have to be a NEW magma chamber. The earthquake's
epicenter is only a few miles north of Hualalai. Hualalai is an
often-overlooked volcano on the Big Island. But it erupted as recently
as 1801, and scientists suspect that it might not be extinct just yet.
http://hvo.wr.usgs.gov/volcanoes/hualalai/
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Date: 17 Oct 2006 01:27:00
From: John Ladasky
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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George wrote:
> "Starlord" <starlord@sidewalkastronomy.info> wrote in message
> news:2NidnQgv-atBYa_YnZ2dnUVZ_vydnZ2d@inreach.com...
> > Being the center of the quake was off shore and deep, I would thing that
> > the mountain they are on would have buffered the shaking a lot. Only
> > thing that gets me is most quakes come from the new island that's
> > southeast of the big island and will not brake surface for another 1,000+
> > Years. I ;ived in Honolulu for a number of years, once while living in a
> > high rise about 73, we had a small quake hit Oahu and as I was laying on
> > the couch, I watched the view of the lani go up and down for about 3
> > mins. I lived in a high rise called KPT and was state housing.
> >
> > Wonder if a new magma chanber has opened under the big island.
>
> This quake was tectonic, not volcanic. The Harvard CMT shows that it was a
> predominantly dip-slip event, and occurred in an area that has seen large
> quakes in the past. If it was strongly felt in Oahu, 140 miles away,
> chances are it was felt on the summit of Mauna Loa as well. But don't take
> my word on that. Maybe those who work on the summit can chime in on the
> matter for the rest of us.
>
> George
The quake was definitely felt in Hilo. However, the reported epicenter
of the quake was on the opposite, western side of the island. I can't
imagine that the mountains in between didn't experience the shake.
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Date: 17 Oct 2006 07:45:30
From: Starlord
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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"tectonic, not volcanic" This is NOT what is being said about it, watched a
report from Hawaii last night and the man they interviewed did say it was a
quake due to magma moving threw chambers some 25 miles deep. Because Hawaii
is NOT near the edge of any plate, their quate action is genarated via
volcanic deep forces not plate as the mainland. He said while they can't say
for sure, it is possiable that a magma chamber became empty and fell in on
itself due it no support. Main thing is that there was NO change to the
contours of the ocean floor.
--
The Lone Sidewalk Astronomer of Rosamond
Telescope Buyers FAQ
http://home.inreach.com/starlord
Sidewalk Astronomy
www.sidewalkastronomy.info
The Church of Eternity
http://home.inreach.com/starlord/church/Eternity.html
"John Ladasky" <ladasky@my-deja.com > wrote in message
news:1161073620.330620.315150@i42g2000cwa.googlegroups.com...
>
> George wrote:
>
> The quake was definitely felt in Hilo. However, the reported epicenter
> of the quake was on the opposite, western side of the island. I can't
> imagine that the mountains in between didn't experience the shake.
>
>
> +-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+
>
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Date: 17 Oct 2006 11:15:57
From: David Knisely
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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Starlord posted:
> "tectonic, not volcanic" This is NOT what is being said about it, watched a
> report from Hawaii last night and the man they interviewed did say it was a
> quake due to magma moving threw chambers some 25 miles deep. Because Hawaii
> is NOT near the edge of any plate, their quate action is genarated via
> volcanic deep forces not plate as the mainland. He said while they can't say
> for sure, it is possiable that a magma chamber became empty and fell in on
> itself due it no support. Main thing is that there was NO change to the
> contours of the ocean floor.
From what I understand, the quake was not due to any magma movement,
but from the stress of the weight of the island on the surrounding
plate. As the big island has increased in size and mass, it is putting
an increasing strain on the surrounding plate, resulting in earthquakes
as the section of plate supporting the island settles slightly. We see
this on Mars with the fractures that show up around the large Tharsis
volcanoes, so I suppose it isn't surprising to see this with a large
volcanic mass in the middle of the Earth's Pacific plate. Clear skies
to you.
--
David W. Knisely KA0CZC@navix.net
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/
**********************************************
* Attend the 13th Annual NEBRASKA STAR PARTY *
* July 23-28, 2006, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************
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Date: 17 Oct 2006 18:53:15
From: George
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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"Starlord" <starlord@sidewalkastronomy.info > wrote in message
news:haCdnanw8vurc6nYnZ2dnUVZ_u6dnZ2d@inreach.com...
> "tectonic, not volcanic" This is NOT what is being said about it, watched
> a report from Hawaii last night and the man they interviewed did say it
> was a quake due to magma moving threw chambers some 25 miles deep.
> Because Hawaii is NOT near the edge of any plate, their quate action is
> genarated via volcanic deep forces not plate as the mainland. He said
> while they can't say for sure, it is possiable that a magma chamber
> became empty and fell in on itself due it no support. Main thing is that
> there was NO change to the contours of the ocean floor.
>
>
> --
> The Lone Sidewalk Astronomer of Rosamond
>
> Telescope Buyers FAQ
> http://home.inreach.com/starlord
> Sidewalk Astronomy
> www.sidewalkastronomy.info
> The Church of Eternity
> http://home.inreach.com/starlord/church/Eternity.html
It doesn't have to be plate boundary-related. There are many
faults/fracture zones that cross-cross the region, as well as grabens that
cross the volcanic edifices. One interesting fault is the plane that makes
up the boundary between the oceanic crust and the volcanic edifice itself,
and is the original surface upon which the volcano was built. I know that
some have suggested that it was caused by the movement of magma, but the
seismic data simply doesn't support that interpretation. The Harvard
moment tensor solution (see the first link, below) indicated that it had a
distinctly normal (dip-slip) component to it, and there were no harmonic
tremors associated with the event. Very few volcanic tremors occur in the
magnitude range of this event. The magnitude, duration, depth, sense of
displacement, and other parameters indicated brittle failure, not magmatic
movement. Gerard Fryer, of the Pacific Tsunami Warning center suggested
that it was caused by failure due to loading of the lithosphere by the
Island's huge mass. I agree with that conclusion. There have been similar
tremors at that depth, of similar magnitude, and in the vicinity of that
epicenter in the past.
http://neic.usgs.gov/neis/eq_depot/2006/eq_061015_twbh/neic_twbh_hrv.html
Here is the seismic record for the event:
http://neic.usgs.gov/neis/eq_depot/2006/eq_061015_twbh/neic_twbh_r.html
And here is the energy and broadband solutions:
http://neic.usgs.gov/neis/eq_depot/2006/eq_061015_twbh/neic_twbh_e.html
And here is the explanation from the NEIC:
http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/ustwbh.php#summary
The 15 ober earthquake is probably not directly related to future
volcanic eruptions. Non-volcanic Hawaiian earthquakes reflect the long-term
accumulation and release of lithospheric stresses, rather than short-term
processes associated with the motion of magma before or during an eruption.
The long-term stresses consist in part of stresses generated in the crust
and mantle by the weight of the volcanic rock that composes the islands. In
that sense, most Hawaiian earthquakes that are not directly associated with
eruptions are nonetheless broadly related to volcanic activity.
Earthquakes on the volcanic Island of Hawaii are not rare. The largest on
record was the magnitude 7.9 1868 earthquake near the south coast which
triggered a tsunami that drowned 46 people and which spawned numerous
landslides that resulted in 31 deaths. A magnitude 6.9 tremor on August 21,
1951, damaged scores of homes on the Kona coast and triggered numerous
damaging landslides.
Here are some seismograms of typical harmonic tremors associated with
magmatic activity:
http://www.ees.nmt.edu/Geop/mevo/seismic/tremor.html#beating
By the way, the magnitude has been revised upward to a 6.7.
George
>
> "John Ladasky" <ladasky@my-deja.com> wrote in message
> news:1161073620.330620.315150@i42g2000cwa.googlegroups.com...
>>
>> George wrote:
>>
>> The quake was definitely felt in Hilo. However, the reported epicenter
>> of the quake was on the opposite, western side of the island. I can't
>> imagine that the mountains in between didn't experience the shake.
>>
>>
>> +-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+
>>
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Date: 19 Oct 2006 17:00:26
From: Steve Willner
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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I've heard a rumor that Keck 1 is back in operation but Keck 2 will
take a few more days. No guarantees of accuracy.
The Infrared Telescope Facility sent the following email yesterday:
Many of you have expressed some concern regarding the status of the
IRTF, and I am pleased to announce that we are fine.
A 6.6 magnitude earthquake struck near the South Kohala Coast on
Sunday, ober 15, at 7:07 AM. The IFA facilities in Hilo did not
suffer any significant damage, although the Waimea facilities of Keck
and CFHT did have extensive damage. There were no injuries at home
or at the observatory reported by our staff.
A visual inspection of the IRTF has revealed no perceptible damage,
although the earthquake had knocked over many small items. Quick
action by George Koenig, Eric Tollestrup, Charles Lockhart and
Miranda Hawarden-Ogata on Sunday was crucial in minimizing problems
with the facility and instruments. The air conditioning system and
electronics were secured before the power was turned on. Electric
power was restored at about 2:30PM on Sunday, and the instruments
were nurtured back to health. NSFCAM2 has a large format array that
had to be carefully watched to prevent large temperature excursions.
We just opened up this morning (. 17) for observations of Saturn
and are operating normally. We may find additional problems later,
and we appreciate your patience if it affects your observing.
--
Steve Willner Phone 617-495-7123 swillner@cfa.harvard.edu
Cambridge, MA 02138 USA
(Please email your reply if you want to be sure I see it; include a
valid Reply-To address to receive an acknowledgement. Commercial
email may be sent to your ISP.)
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Date: 17 Oct 2006 08:17:05
From: George
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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"John Ladasky" <ladasky@my-deja.com > wrote in message
news:1161073620.330620.315150@i42g2000cwa.googlegroups.com...
>
> George wrote:
>> "Starlord" <starlord@sidewalkastronomy.info> wrote in message
>> news:2NidnQgv-atBYa_YnZ2dnUVZ_vydnZ2d@inreach.com...
>> > Being the center of the quake was off shore and deep, I would thing
>> > that
>> > the mountain they are on would have buffered the shaking a lot. Only
>> > thing that gets me is most quakes come from the new island that's
>> > southeast of the big island and will not brake surface for another
>> > 1,000+
>> > Years. I ;ived in Honolulu for a number of years, once while living in
>> > a
>> > high rise about 73, we had a small quake hit Oahu and as I was laying
>> > on
>> > the couch, I watched the view of the lani go up and down for about 3
>> > mins. I lived in a high rise called KPT and was state housing.
>> >
>> > Wonder if a new magma chanber has opened under the big island.
>>
>> This quake was tectonic, not volcanic. The Harvard CMT shows that it
>> was a
>> predominantly dip-slip event, and occurred in an area that has seen
>> large
>> quakes in the past. If it was strongly felt in Oahu, 140 miles away,
>> chances are it was felt on the summit of Mauna Loa as well. But don't
>> take
>> my word on that. Maybe those who work on the summit can chime in on the
>> matter for the rest of us.
>>
>> George
>
>
> The quake was definitely felt in Hilo. However, the reported epicenter
> of the quake was on the opposite, western side of the island. I can't
> imagine that the mountains in between didn't experience the shake.
That is what I was told by a friend who lives in Hilo, as well. Another
friend contacted the Keck Observatory, and they told him that the mirrors
are fine, that the biggest problem they have is that some of the alignment
equipment was slightly damaged. The scopes are offline right now and being
repaired. I was led to believe that it wouldn't take them more than a
couple of days to affect repairs.
George
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Date: 17 Oct 2006 00:23:32
From: John Ladasky
Subject: Re: Hawaiian Earthquake -- Effect on observatories
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Skywise wrote:
> "mcltunes" <webmaster@mcltunes.com> wrote in news:1160966916.199400.320550
> @b28g2000cwb.googlegroups.com:
>
> > Does anyone have any first hand experience with the Kecks and know if
> > they were affected at all by the earthquake? Thanks in advance...
> >
> > -- Mark
>
> sci.astro added
>
> After reading your post I contacted the PIO at the Keck observatory.
> She said the mirrors appear to be fine, as are spare segments and
> the instruments. But the quake did cause the scopes to move in their
> mounts and there is damage to the precision reference marks.
>
> They now have a quake update page on their site with more information.
>
> http://www.keckobservatory.org/article.php?id=95
>
> Brian
I have a friend who works at the Gemini telescope facility, just up the
road from Keck. He's not actually in Hawaii at the moment, but he has
been in touch with his workplace by email. Unofficially, what he has
heard (and what I am passing along here) is that there has been no
major damage to Gemini.
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