Quake Watch 2011

reply to post by MamaJ


Actually this is a fairly common magnitude for the area.

Take a look at this search on USGS

ETA: And no there have been 4.5s, 4.3s - a few 3.9s 3.8s. All in that list.

You may want to try that with a smaller radius. I picked 100 because 'Merca is a big place, but I have no idea how that relates to Nevada.

Just to make it a tad easier here are 50 and 25 km radius

50 km radius

25 km radius

Bigger ones still in there at 25 km radius.

reply to post by PuterMan


OH WOW!!!! How did you get to that on USGS site???? I wanna do it!!!!

I see they upgraded it to a 3.9

reply to post by MamaJ


[atsimg]http://files.abovetopsecret.com/images/member/ded36996ef86.png[/atsimg]

ETA: Lat and Lon must be decimal values and negative for South and West.

5.36 hours into the 18th Aug UTC and no quakes above 3.8

2011-08-18 01:17:26 3.8 44.99°N 16.95°E 10 A NW Balkan Region

reply to post by muzzy


Anywhere? 4.6 off Equador at 5.23am
www.emsc-csem.org...

Think I'm right?
Rainbows
Jane

It's probably just me, but I find it strange that the last 5 EQ's reported on EMSC are all at 10km.
No doubt PuterMan can prove there have been a series like this before......please don't.....just tell me!

2011-08-18 12:32:12.3
13min ago 36.42 N 21.71 E 10 ML 2.8 SOUTHERN GREECE 2011-08-18 12:36
2011-08-18 11:57:43.0
47min ago 42.63 N 42.92 E 10 mb 5.0 GEORGIA (SAK'ART'VELO) 2011-08-18 12:13
2011-08-18 11:51:37.2
53min ago 38.37 N 24.17 E 10 ML 2.0 AEGEAN SEA 2011-08-18 11:55
2011-08-18 11:49:28.0
55min ago 46.45 N 2.59 E 10 ML 2.2 FRANCE 2011-08-18 11:57
2011-08-18 11:32:59.0
1hr 12min ago 40.89 N 22.89 E 10 ML 2.2 GREECE


Rainbows
Jane

reply to post by angelchemuel


When I first started watching quakes, I noticed the same thing about the 10km depths. But then someone told me that it's a default setting. So, the quakes are not all precisely at 10km.

Here's an explaination of depth values.

"The depth where the earthquake begins to rupture. This depth may be relative to mean sea-level or the average elevation of the seismic stations which provided arrival-time data for the earthquake location. The choice of reference depth is dependent on the method used to locate the earthquake. Sometimes when depth is poorly constrained by available seismic data, the location program will set the depth at a fixed value. For example, 33 km is often used as a default depth for earthquakes determined to be shallow, but whose depth is not satisfactorily determined by the data, whereas default depths of 5 or 10 km are often used in mid-continental areas and on mid-ocean ridges since earthquakes in these areas are usually shallower than 33 km. "
USGS

reply to post by Robin Marks


sorry
too break in but,

your needed in Montana,,

"Siding with industry, Montana’s Board of Oil & Gas unanimously approved rules which permit industry to keep secret fluids used in fracking wells."

reply to post by Robin Marks

Thank you for that. I also read somewhere that we shouldn't worry about EQ's that are more than 10km...can't remember if it was because of tectonic or magma movement....think it was tectonic.
Rainbows
Jane

Here's a good one near a junction off-shore in Canada:

Magnitude
4.5
Date-Time
Thursday, August 18, 2011 at 15:35:45 UTC
Thursday, August 18, 2011 at 08:35:45 AM at epicenter
Location
51.652°N, 130.741°W
Depth
10.7 km (6.6 miles)
Region
QUEEN CHARLOTTE ISLANDS REGION
Distances
250 km (156 miles) WNW (297°) from Port Hardy, BC, Canada
296 km (184 miles) S (186°) from Prince Rupert, BC, Canada
390 km (243 miles) S (172°) from Metlakatla, AK
599 km (372 miles) WNW (299°) from Vancouver, British Columbia, Canada
Location Uncertainty
horizontal +/- 18.9 km (11.7 miles); depth +/- 6 km (3.7 miles)
Parameters
NST=232, Nph=237, Dmin=190.4 km, Rmss=1.38 sec, Gp=140°,
M-type=body wave magnitude (Mb), Version=8
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usc0005g8h

Be Well

reply to post by Bishop2199


and another -

4.6 2011/08/18 15:37:40 51.746 -130.794 10.0 379 km (236 mi) S of Metlakatla, AK
4.5 2011/08/18 15:35:45 51.652 -130.741 10.7 390 km (243 mi) S of Metlakatla, AK

Source

reply to post by PuterMan


YOU ARE AWESOME!!!!! Thank you very much for the details ...you must have known I am a visual learner. lol

Originally posted by angelchemuel
reply to post by muzzy

 

Anywhere? 4.6 off Equador at 5.23am
www.emsc-csem.org...
Think I'm right?
Rainbows
Jane

You are right, but look when they put it on the list, after the 5.36 observation point
Reception Time 2011-08-18 05:56 UTC
on the Scientific Data page

Just seemed unusual, probably wasn't, I don't often check the lists more than once a day, but in this case did it 3 times during the day and noticed the quiet period, especially on USGS, so checked the others too.

After the lag

Magnitude mb 5.0
Region GEORGIA (SAK'ART'VELO)
Date time 2011-08-18 11:57:43.0 UTC
Location 42.63 N ; 42.92 E
Depth 10 km
Distances 44 km N Kutaisi (pop 178,338 ; local time 16:57:43.5 2011-08-18)
24 km SE Lentekhi (pop 10,442 ; local time 16:57:43.5 2011-08-18)
13 km E Tsageri (pop 2,163 ; local time 16:57:43.5 2011-08-18)

USGS had 5.1mb for this one FWIW


Edit: New Zealand also experienced a 5hr time lag as well

3564262, -40.50317, 174.3802, 2011/8/18 0:21:30, 3.061ML, 81km, Tasman Sea, o/s NE of Stephens Island, Marlborough
~ 4 hours, 58 minutes and 21 seconds lag ~
3564374, -40.3203, 176.46173, 2011/8/18 5:19:51, 2.432ML, 18km , 134 Te Tohe Rd, Mangaorapa 4291

* but they didn't qualify either because they were below 3.8

6.2mw 2011/08/19 03:54:28 -16.526 -176.905 413.2 FIJI REGION
mb = 5.6 ML = 6.1

earthquake.usgs.gov...

EMSC 5.5mb and GFZ 5.6 mb

Doesn't look like a 6 on SNZO, although its pretty deep, so that doesn't help much

Issued at, Occurred at, Region Name, Magnitude, Maximum seismic intensity (JMA)
14:41 JST 19 Aug 2011, 14:36 JST 19 Aug 2011, Fukushima-ken Oki, 6.8ML, 5

www.jma.go.jp...



Just had Apogee yesterday Aug 18 16:24 405159 km

MAG 6.5 NEAR THE EAST COAST OF HONSHU, JAPAN

MAG 6.2 FIJI REGION

MAG 5.0 KURIL ISLANDS

getting busy...

thanks USGS...earthquake.usgs.gov...


seeya

reply to post by muzzy


So JMO:

Earthquake Information (Information on seismic intensity at each site)
Issued at 14:49 JST 19 Aug 2011

Occurred at (JST) Latitude
(degree) Longitude
(degree) Depth Magnitude Region Name
14:36 JST 19 Aug 2011 37.6N 141.9E 20 km 6.8 Fukushima-ken Oki

www.jma.go.jp...

EMSC:

Magnitude mb 6.7
Region NEAR EAST COAST OF HONSHU, JAPAN
Date time 2011-08-19 05:36:34.0 UTC
Location 37.71 N ; 141.67 E
Depth 60 km

www.emsc-csem.org...

USGS:

Magnitude 6.3
Date-Time

Friday, August 19, 2011 at 05:36:32 UTC
Friday, August 19, 2011 at 02:36:32 PM at epicenter
Time of Earthquake in other Time Zones

Location 37.673°N, 141.716°E
Depth 43.6 km (27.1 miles)
Region NEAR THE EAST COAST OF HONSHU, JAPAN

earthquake.usgs.gov...

Note USGS dropped from 6.5

We have three different magnitudes and three different depths.

I declare this to be a 6.5 BS at 1.75 million inches

Consistency is NOT one of USGS best traits. Whereas quakes are normally determined in Mw, in this instance they have chosen Mb

mb = 6.3 (474) ML = 6.0 ( 10) mblg = 5.4 ( 13) md = 0.0 ( 0) MS = 5.9 (399)

But note that ML is 6.0 and MS (closest equivalent to Mw) is 5.9.

Now unless JMO is using MJ which is it's own and a scale I don't have the equivalent for (I think it is ML) then I think they are emitting an aroma of Pork Pie.

Quite how EMSC can get such a different mb figure to USGS I am not sure. Watch it change!

Sheesh, seismologists!!

ETA: Useful bit of information. Comparing the EMSC and USGS phase data the magnitude figure in the USGS data, for which the scale is not stated, it seems the USGS are mb as they match the EMSC, which are stated as mb.

Date/Time UTC,Latitude,Longitude,Magnitude,Depth(Km),Location
2011-08-19 03:54:27, -16.525, -176.905, 6.2, 413.2, Fiji Region

PDF Package for Magnitude 6.2 Fiji usc0005glw now available. (1.6 Mb download)
usc0005glw.zip

Web site images only (853 Kb download)
usc0005glw_images.zip

View web version of page here

Date/Time UTC,Latitude,Longitude,Magnitude,Depth(Km),Location
2011-08-19 05:36:32, 37.666, 141.747, 6.3, 39.1, Nr. E. Coast Of Honshu. Japan

PDF Package for Magnitude 6.3 Nr E. Coast Honshu. Japan usc0005gmg now available. (2.4 Mb download)
usc0005gmg.zip

Web site images only (1.3 Mb download)
usc0005gmg_images.zip

View web version of page here

Originally posted by Bishop2199
Here's a good one near a junction off-shore in Canada:

Magnitude
4.5
Date-Time
Thursday, August 18, 2011 at 15:35:45 UTC
Thursday, August 18, 2011 at 08:35:45 AM at epicenter
Location
51.652°N, 130.741°W
Depth
10.7 km (6.6 miles)
Region
QUEEN CHARLOTTE ISLANDS REGION
Distances
250 km (156 miles) WNW (297°) from Port Hardy, BC, Canada
296 km (184 miles) S (186°) from Prince Rupert, BC, Canada
390 km (243 miles) S (172°) from Metlakatla, AK
599 km (372 miles) WNW (299°) from Vancouver, British Columbia, Canada
Location Uncertainty
horizontal +/- 18.9 km (11.7 miles); depth +/- 6 km (3.7 miles)
Parameters
NST=232, Nph=237, Dmin=190.4 km, Rmss=1.38 sec, Gp=140°,
M-type=body wave magnitude (Mb), Version=8
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usc0005g8h

Be Well

edit on 8/18/2011 by Bishop2199 because: (no reason given)

4.5 is o.k. It's alarming, you get an adrenalin rush, but even at that depth ( we've had plenty of practice :/) it's not a "duck under the desk" sort of quake.

Damn, I wish I didn't know that.

talking to myself again, following on from post by PuterMan


Note EMSC has brought it down to 6.3 Mb now, but JMO still has it at 6.8. It certainly does not look like a 6.8 as muzzy said.

www.emsc-csem.org...