Quake Watch 2012

They say cities begin to be evacuated.

Reports from Mexico are putting this earthquake at a 6.5 Magnitude lasting as long as 5 Minutes - Thousands have been evacuated from buildings and homes

reply to post by Anneke


As Puterman pointed out there is the usual magnitude type difference, but here is some more bits and pieces of info on that quake to add to the confusion.

On the magma search data base it comes up as 5.582ML

On Geonet Rapid its 4.7, after 13 automatic attempts and 2 manual reviews
geonet rapid

based on the Felt Reports and the distances from whence they came I'd say it was more than 4.7. There were 4 x 5MM reports, and 417 total.

On the other hand it hardly shows on LISS SNZO (7:00 line) like a Mag 5 would. However the location is on the Pacific Plate, wheras SNZO is on the Australian Plate and may explain that. Thats why SNZO always shows Fiji, Tonga and Vanuatu quakes as quite large traces, they are also on or border the Australian Plate.

As for location, I'd go with the Geonet one at Irene River, that is a hot spot and there are quakes there all the time. USGS are notoriously wrong with locating NZ quakes, they have it about 20km SE, nearer to Lake Te Anau.
Likewise siesme.nc have it way up near Milford Sound.

Graphs?
nearest IRIS station nearby is Otahua Downs, inland from Oamaru, Otago,but it doesnt look very big on that ODZ.NZ.10.HHE channel
compared to Geonets ODZ

some of the other nearby Geonet stations show quite a big trace too, similar to ODZ
Wether Hill Road, close to Ohai, in Southland

Wanaka, Otago


So for the time being I'd go with Geonets report of 5.6, it may be adjusted after review (in about 30 days) but waddausgsknow

Originally posted by this_is_who_we_are
There's your 188 day quake .

In the event that the 188 day earthquake does succeed (this would be about 25-40 hours too soon), I do hope that this isn't a foreshock to something bigger to come tomorrow, in the Japan sort of sequence.

reply to post by this_is_who_we_are


188 days from when?

The last one which was nearly a seven was on the 14th March. I know my maths is not good but I don't make that 188 days.

Since 188 days

Date/Time UTC,Latitude,Longitude,Magnitude,Depth(Km),Location
2012-03-20 18:02:48, 16.662, -98.187, 7.6, 17.5, Oaxaca. Mexico
2012-02-02 13:34:40, -17.765, 167.134, 7.1, 23.1, Vanuatu
2012-01-10 18:36:59, 2.452, 93.208, 7.2, 20.5, Off W. Coast Of Northern Sumatra
2011-12-14 05:04:57, -7.517, 146.766, 7.1, 121.2, Eastern New Guinea Region. P.N.G
2011-10-23 10:41:21, 38.691, 43.497, 7.1, 16.0, Eastern Turkey
2011-10-21 17:57:16, -28.998, -176.182, 7.4, 32.9, Kermadec Isls. Region
2011-09-15 19:31:02, -21.559, -179.368, 7.3, 626.1, Fiji Region

Maybe someone forgot to tell the ones in between that they should not have happened. Sort of spoils the 188 day sequence really.

Originally posted by PuterMan
reply to post by diamondsmith

 

Some towns right on top of that one. Not good.

No technical details yet.

If it was off shore not a problem,I guess.I wonder when the last big one hit that area if ever.

reply to post by diamondsmith


Based on 100 km radius from the epicentre

CAT YEAR MO DA ORIG TIME LAT LONG DEP MAGNITUDE IEM DTSVNWG DIST
NFO km
TF

PDE 1975 04 23 111448 16.45 -98.91 11 6.5 UKPAS .F. ....... 80
PDE 1982 06 07 065237.37 16.61 -98.15 40 7.2 MSBRK .DM ....... 7
PDE 1982 06 07 105940.16 16.56 -98.36 33 7.0 MsGS .CM ....... 21
PDE 1984 07 02 045044.13 16.80 -98.44 46 6.5 MSBRK .FM ....... 31
PDE 1993 10 24 075215.63 16.75 -98.72 20 6.7 MwGS 7FM ....... 57
PDE 1995 09 14 140431.43 16.78 -98.60 23 7.4 MwGS .CM ....... 45
PDE 1996 02 25 030815.87 15.98 -98.07 21 7.1 MwGS .FM ....... 76
PDE 1997 07 19 142208.75 16.33 -98.22 33 6.9 MwGS .FM ....... 36

Source






WPHASE data just in - Mag 7.3

12/03/20 18:02:48

Epicenter: 16.662 -98.187
MW 7.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/03/20 18:02:48.00
Centroid: 16.262 -97.665
Depth 11 No. of sta: 30
Moment Tensor; Scale 10**19 Nm
Mrr= 6.30 Mtt=-6.17
Mpp=-0.13 Mrt= 8.97
Mrp=-6.92 Mtp= 1.74
Principal axes:
T Val= 13.26 Plg=58 Azm= 47
N = -0.45 9 301
P =-12.81 30 206

Best Double Couple:Mo=1.3*10**20
NP1:Strike=268 Dip=17 Slip= 55
NP2: 124 76 100

USGS WPhase Moment Solution

Alert information for this event is currently under review and will be available soon. Thank you for your patience.

earthquake.usgs.gov...

This is not good. This is normally automated

Doesn't look like a 7.9 here, but not sure about the scale on this graph, Vertical scale 400E-6 [1,627,757 counts]
IRIS UNM BHZ:: Unam - Mexico


Different scale on this one, Vertical scale [170,833 counts]?
[url=http://www.iris.edu/servlet/quackquery/plotcache/webicorder_fJRQG.MG..HHE.2012.080.png]MG.JRQG HHE
Juriquilla, Queretaro, Mexico
but looks about the same

reply to post by PuterMan

Based on 100 km radius from the epicentre

Thank you for that.

No shake map yet.

I guess is not uncommon for the area.

reply to post by diamondsmith






Not too many people right on top of it.

@muzzy - 7.3 final I think - depends on the centriod tensor.

We have phase data now

20 MAR 2012 ( 80)

ot = 18:02:48.95 +/- 1.78 OAXACA, MEXICO
lat = 16.662 +/- 9.7
lon = -98.188 +/- 9.1 MAGNITUDE 7.6 (GS)
dep = 17.5 +/- 4.3

136 km (84 miles) SSW of Huajuapan de Leon, Oaxaca, Mexico (pop 45,000)
162 km (101 miles) WSW of Oaxaca, Oaxaca, Mexico
171 km (106 miles) SE of Chilpancingo, Guerrero, Mexico
322 km (200 miles) SSE of MEXICO CITY, D.F., Mexico

nph = 413 of 425 se = 0.88 FE=058 A

error ellipse = (216.0, 4.0, 15.8;306.0, 0.0, 12.7; 43.0, 85.0, 6.5)

mb = 6.6 (353) ML = 0.0 ( 0) mblg = 0.0 ( 0) md = 0.0 ( 0) MS = 7.3 ( 12)

neic.usgs.gov...


Shake maps now

earthquake.usgs.gov...

Magnitude mb 5.0
Region OAXACA, MEXICO
Date time 2012-03-20 18:35:46.0 UTC
Location 16.56 N ; 98.08 W
Depth 60 km
Distances 277 km S Puebla (pop 1,392,099 ; local time 12:35:46.2 2012-03-20)
155 km W Oaxaca (pop 262,566 ; local time 12:35:46.2 2012-03-20)
10 km SE Cacahuatepec (pop 3,636 ; local time 12:35:46.2 2012-03-20)
27 km NW Pinotepa nacional (pop 25,669 ; local time 12:35:46.2 2012-03-20)

EMSC

Starting to show on LISS now SDV (Santo Domingo, Venezuela)
and some of the US stations
yeah looks like a 7+ there

GFZ have dropped to 7.2 down from 7.7 first try auto recording

F-E Region: Near Coast of Guerrero, Mexico
Time: 2012-03-20 18:02:52.0 UTC
Magnitude: 7.2 (Mw)
Epicenter: 98.11°W 16.77°N
Depth: 34 km
Status: M - manually revised

geofon.gfz-potsdam.de...

reply to post by PuterMan

Not too many people right on top of it.

I believe this time they escaped with minimal damage and this is the most important thing.

The rest is history.

reply to post by muzzy


GeoAzure 7.4
USGS 7.3 as noted already
GeoFon 7.2

Come on guys, you are not trying. We can get this below 7 if we really try.


reply to post by diamondsmith

reply to post by PuterMan


That GeoAzure's a new one.

The Mexican site isn't working off your QVS link page BTW, not sure if the address has changed or its just overloaded.

Unable to connect
Firefox can't establish a connection to the server at www.ssn.unam.mx.

.

reply to post by muzzy


USA, New Mexico, Albuquerque [IU]

Thanks, I will check it out.

Looks like overload to me. I will wait til things die down a bit and check it again.


Closest realtime seismo UNM.G.00.BHZ.2012.080

USGS have reduced to 7.4 Mw

This is a YELLOW pager alert for fatalities and economic losses.

earthquake.usgs.gov...

reply to post by PuterMan


I went in through a side door
they are saying 7.8

:: NUM. EVENTO 3
:: FECHA 2012-03-20
:: HORA 12:02:50
:: LATITUD 16.42
:: LONGITUD -98.36
:: PROFUNDIDAD 15
:: MAGNITUD 7.8
:: EPICENTRO 29 km al SUR de OMETEPEC, GRO

www2.ssn.unam.mx...

graph of the quake PL HHZ

having problems with their maps, need the API key

Yes,

Mw 7.8

Mw....

reply to post by muzzy


Side door added to the listings

Thanks muzzy.

TV reports are not saying anything about fatalities yet.

reply to post by PuterMan


no problemo senor

not sure whats going on with the maps though.