[meteorite-list] Fwd: 1/17/18 Bolide-Seismic Event

From: Greg Redfern <gredfern029_at_meteoritecentral.com>
Date: Wed, 17 Jan 2018 14:11:05 -0500
Message-ID: <CAOU4k=wCxGNxJmV_qdWqRh3A6b-FSSJhw2J2H+UbneXtqCd2pw_at_mail.gmail.com>

Dear List,

Thought I would share this info from Dr. Larry Ruff, University of Michigan.

Greg Redfern
NASA JPL Solar System Ambassador <http://solarsystem.nasa.gov/ssa/home.cfm>
Daily Blog <http://www.whatsupthespaceplace.com>
Twitter <https://twitter.com/SkyGuyinVA>
WTOP <http://wtop.com/section/tech/the-space-place-tech/>


Dear Greg,
I'll try to provide some quick responses to your questions:

"Is that due to the proximity of the bolide to the seismic monitoring
station(s) or some other factor? How many have you seen?"

Yes, it is the combination of proximity & event size that makes the
largest wave amplitudes.
Over the years, this is the ONLY clear meteor-generated waves that
I've seen at Ann Arbor.
IN the past I have looked for waves at Ann Arbor from 2 large sonic
booms (one over Lake
Michigan, the other over Ohio), but did not found any waves above noise
level.

"Also, is there any way to correlate the USGS Magnitude 2.0 assessment
to the amount of kinetic energy released in the form of the acoustic
waves from this bolide event?"

Very difficult and tricky. The magnitude scale was developed for
seismic waves from
earthquakes, and the wave characteristics are quite different from an
atmospheric event.
Previous scientific work shows that there is fairly weak coupling from
air waves to seismic
waves, so any energy connection is poorly determined.

"Finally, is U-M mounting an information campaign to educate the
public on what to look for in terms of new meteorites."

As I far as I know, there is no public educational campaign today, but
there are a few faculty
who want to go find some meteorites if they can get a more precise
location for the debris.

regards, Larry Ruff







On 1/17/18, Greg Redfern <gredfern029 at gmail.com> wrote:
> Good Morning Dr. Ruff,
>
> I am the space reporter for WTOP (see my links below) and have a few
> questions regarding this amazing event, if you don't mind.
>
> In the U-M Press Release they quoted you as saying, "This is the strongest
> signal?the best seismogram?of all the ones I've seen over the years at the
> Ann Arbor station."
>
> Is that due to the proximity of the bolide to the seismic monitoring
> station(s) or some other factor? How many have you seen?
>
> Also, is there anyway to correlate the USGS Magnitude 2.0 assessmen
> <https://earthquake.usgs.gov/earthquakes/eventpage/us2000ck7p#executive>t
> to the amount of kinetic energy released in the form of the acoustic waves
> from this bolide event?
>
> Finally, is U-M mounting an information campaign to educate the public on
> what to look for in terms of new meteorites.
>
> Thank you so much and good luck on finding new space rocks!
>
> Greg Redfern
> NASA JPL Solar System Ambassador <http://solarsystem.nasa.gov/ssa/home.cfm
>
> Daily Blog <http://www.whatsupthespaceplace.com>
> Twitter <https://twitter.com/SkyGuyinVA>
> WTOP <http://wtop.com/section/tech/the-space-place-tech/>
>
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Received on Wed 17 Jan 2018 02:11:05 PM PST