Quake Watch 2011

reply to post by berkeleygal


A quake at the edge of a
hurricane, don't believe
I have ever seen that
before.

The following super volcanoes have had updates today as follows

Whakamaru 2011-09-06 11:56:03 2.6 5 Km
Yellowstone 2011-09-06 13:18:26 2.3 2.00 Km
Campi Flegrei 2011-09-06 10:47:28 5.0 25 Km
Reporoa 2011-09-06 11:56:03 2.6 5 Km

From hisz.rsoe.hu...

Rainbows
Jane

Earthquake Details

* This event has been reviewed by a seismologist.

Magnitude 5.1
Date-Time

* Tuesday, September 06, 2011 at 17:54:52 UTC
* Wednesday, September 07, 2011 at 02:54:52 AM at epicenter

Location 36.698°N, 141.650°E
Depth 27.9 km (17.3 miles)
Region NEAR THE EAST COAST OF HONSHU, JAPAN
Distances 78 km (48 miles) ESE of Iwaki, Honshu, Japan
110 km (68 miles) ENE of Mito, Honshu, Japan
137 km (85 miles) SE of Koriyama, Honshu, Japan
204 km (126 miles) NE of TOKYO, Japan
Location Uncertainty horizontal +/- 16.5 km (10.3 miles); depth +/- 8.8 km (5.5 miles)
Parameters NST= 71, Nph= 72, Dmin=309.5 km, Rmss=1.39 sec, Gp=119°,
M-type=body wave magnitude (Mb), Version=6
Source

* Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)

Event ID usc0005pt4

reply to post by muzzy


That's a very logical explanation - thank you! I have one follow-up question for you, or any other veteran quake gurus. I assume that the reporting system/software that does the rounding of coordinates is not new, so I am compelled to ask if you have seen this pattern before? If not, what is unique about this small quake swarm?

I appreciate y'all's patience with me. I'm trying to educate myself in the ways of seismology.

reply to post by Open2Truth


Indeed it is. EMSC use 2 decimal places, USGS use 4 decimal places and GeoNet use 5 decimal places. Japan (JMO) uses one decimal place - I hate that!

Somewhere way back on this thread I did an explanation of what this means on the ground but basically....

A degree of latitude is approximately 69 miles, and a minute of latitude is approximately 1.15 miles. A second of latitude is approximately 0.02 miles, or just over 100 feet.

A degree of longitude varies in size. At the equator, it is approximately 69 miles, the same size as a degree of latitude. The size gradually decreases to zero as the meridians converge at the poles. At a latitude of 45 degrees, a degree of longitude is approximately 49 miles.

National Atlas .gov

Obviously the closer your decimal point gets to one whole degree the more inaccurate the location will become.

This is why you see grids of earthquake locations.

ETA: By the way yes. Grid patterns are common in swarms due to the number of quakes. Makes them more noticeable.

Latest EQ in UK, albeit 24hrs ago!
2011/09/05 02:23:25.5 51.988 1.799 11.0 1.8 SOUTHERN NORTH SEA 30KM EAST FELIXSTOWE
www.earthquakes.bgs.ac.uk...

Rainbows
Jane

reply to post by PuterMan


Thanks Puter - I'm learning about earthquakes despite myself. Really appreciate the info.

reply to post by berkeleygal

and
reply to post by crazydaisy

Good catch berkeleygal what scale in km is that spiral?

In fact its probably not as rare as you may think crazydaisy, but I've never checked both quakes and weather together enough to know how often it does.
The first Cyclone (Southern Hem,) of 2011, Vania co-insided with a Mag 7 at New Hebrides Trench exactly
I can't get the cloud spiral up off australiasevereweather now, but if you cross reference this map of the cyclone track with this earthquake location map you get the image below. Looking at the scale on the map, the Mag 7 occured right when the cyclone was at its strongest Category 3 ( yellow line) and was only 60km from the eye and at the lowest hpa 970





I would draw the conclusion that, no cyclones don't cause earthquakes nor vis-versa, but perhaps both were caused by the same thing ............. Apogee +3 ............ check it out

reply to post by muzzy


Ya know, when I saw that quake last night in the Atlantic, I thought, that's where Katia is, so I went to GoogEarth.

Here is that original image



Here is tonight's image, Katia hasn't moved too far, and I measured where I thought I should and its like 980 some kilometers

reply to post by berkeleygal


I've seen it happen many times before. Quakes near hurricanes/tyfons. I guess it might be the storm surge (or whatever it's called). The extra mass of water probably adds extra stress (weight) to the seabottom below, and trigger earthquakes that are due to happen soon anyway. I don't know, just guessing...

hey gang

I have been catching up on posts and I had missed Bob's map of the Czech swarm... I am intrigued !

Why are they lined up like that?? too weird



www.emsc-csem.org...

looks like a grid pattern to me, I've never seen anything like it!



Live seismograms of stations of the Czech Regional Seismic Network
www.ig.cas.cz...

Seismogram from seismic station Novy Kostel (NKC)
rebel.ig.cas.cz...

We're kinda lit up at the moment too.

Japan is rockin' again:

Magnitude
5.3
Date-Time
Wednesday, September 07, 2011 at 13:29:41 UTC
Wednesday, September 07, 2011 at 10:29:41 PM at epicenter
Time of Earthquake in other Time Zones
Location
42.232°N, 142.461°E
Depth
1.5 km (~0.9 mile) (poorly constrained)
Region
HOKKAIDO, JAPAN REGION
Distances
83 km (51 miles) ESE of Tomakomai, Hokkaido, Japan
97 km (60 miles) SW of Obihiro, Hokkaido, Japan
128 km (79 miles) SE of Sapporo, Hokkaido, Japan
763 km (474 miles) NNE of TOKYO, Japan
Location Uncertainty
horizontal +/- 12.5 km (7.8 miles); depth +/- 5.6 km (3.5 miles)
Parameters
NST=272, Nph=274, Dmin=62.3 km, Rmss=1.12 sec, Gp= 76°,
M-type=body wave magnitude (Mb), Version=5
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usc0005q8m

Be Well.

reply to post by berkeleygal


Ye need to go back a page or so.

This was discussed.

Um actually top of this page I just noticed as well.

A bit of movement offshore of Northern California:

Magnitude
2.8
Date-Time
Wednesday, September 07, 2011 at 19:37:06 UTC
Wednesday, September 07, 2011 at 12:37:06 PM at epicenter
Location
40.297°N, 124.391°W
Depth
17.3 km (10.8 miles)
Region
OFFSHORE NORTHERN CALIFORNIA
Distances
10 km (6 miles) WSW (251°) from Petrolia, CA
33 km (20 miles) SW (227°) from Rio Dell, CA
33 km (21 miles) SSW (199°) from Ferndale, CA
58 km (36 miles) SSW (199°) from Eureka, CA
317 km (197 miles) NW (309°) from Sacramento, CA
Location Uncertainty
horizontal +/- 1.4 km (0.9 miles); depth +/- 0.9 km (0.6 miles)
Parameters
Nph= 11, Dmin=9 km, Rmss=0.12 sec, Gp=245°,
M-type=duration magnitude (Md), Version=0
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71641336

Be Well.

Originally posted by muzzy
I would draw the conclusion that, no cyclones don't cause earthquakes nor vis-versa, but perhaps both were caused by the same thing ............. Apogee +3 ............ check it out

edit on 7-9-2011 by muzzy because: (no reason given)

Heres a table showing magnitude events higher than 7.0 that occured within 3 days of a moon phase, note how 4 of the 11 are near Apogee, more than any other phase.


All Mag 7's are on the list except the aftershocks of the Honshu 9.0 which I think are irrelevant regarding what phase of the moon was at ( 2 of them did coincide BTW)
Only 2 events did not coincide with a phase, incl the Mag 9.

I tried the same with Mag 6's, but there were just too many and they seem to occur rather randomly.

Comparing Cyclones/ Hurricanes now

reply to post by muzzy


So basically there is no correlation as we have said before? 4/11 is not a result really since whilst 4 may have been at apogee, only 1 was at perigee leaving 6, i.e. the majority that were neither.

Of the ones at new or full moon there might be a slight case for saying that all happened after the phase therefore there was an effect, but that is very shall we say 'dubious'.

Has anyone noticed that earthquakes above 6 tend to always be in the lower registers generally? There are way more mag 6-6.4 that there are 6.5-6.9 and the same with mag 7. It is also possible to see this is mag 5 but not quite so obvious.

Have any of you ever looked at Google Sky (the constellations) with your earthquake information loaded? I did this last night. Constellation Cassiopia (sp) has all the Alaska quakes in it. I went to USGS and noted the day and time of the 6.2 Fox Islands quake and then opened Stellarium and the closest place I could find there was Unalaska, which is in the same area and there was Cassiopia almost right overhead.

I was going to check other places but as I had Google Sky and Stellarium and my browser all open at once my computer decided it was all too much handle and it just stopped. And I went to bed.

I will do some more research later. I don't know where I am going with this. Just something interesting to me I guess.

reply to post by PuterMan

Not really enough events to draw any decent conclusion but what I see for 2011 so far is
2 that were outside 3 days to anything (18.2%)
2 that were within 3 days of a New Moon (18.2%)
2 that were within 3 days of a Full Moon (18.2%)
1 within a day of Perigee (9.0%)
4 within 3 days of Apogee (36.4%)

so you could say the odds of a Mag 7+ happening around Perigee are 200% more than any of the other phases, or no phase or theres less chance of a 7 on Perigee
I'll have a look at 2010 and see what that comes out at.

Cyclones are proving harder, they pretty much ran non stop Jan through March in the South Pacific or Indian Ocean, so what I might look for is quakes clustered around each cyclone by comparing dates and co-ordinates

reply to post by muzzy


hi Muzzy,

interesting...

i have always thought there may be some sort of trigger
possible RE: "low-pressure systems " and E/Qs....

AND if the MOON can cause the "carnage" it does as it spins around us...( tides etc)
well that must have SOME effect...

not saying either storms or the moon CAUSEs E/Qs,
BUT possibly powerful enough to TRIGGER events that were " on the verge"...maybe???

same with some SOLAR activity... ( and HUMAN activity???)


seeya

reply to post by PuterMan

Has anyone noticed that earthquakes above 6 tend to always be in the lower registers generally?

There are way more mag 6-6.4 that there are 6.5-6.9 and the same with mag 7.

It is also possible to see this is mag 5 but not quite so obvious.

hi PuterMan,

thanks again for keeping such a great thread going...

regarding your above comment...isnt that the way it is meant to be... statistically...?

???

seeya