Quake Watch 2012

5.8 earthquake, 39km ESE of Ishinomaki, Japan. Oct 25 19:32 at epicenter (depth 48km)

2012-10-25 10:32:27 UTC
2012-10-25 19:32:27 UTC+09:00 at epicenter
2012-10-25 06:32:27 UTC-04:00 system time
Location
38.306°N 141.733°E depth=48.1km (29.9mi)

Nearby Cities
39km (24mi) ESE of Ishinomaki, Japan
47km (29mi) ESE of Yamoto, Japan
58km (36mi) ESE of Wakuya, Japan
59km (37mi) E of Matsushima, Japan
342km (213mi) NNE of Tokyo, Japan

reply to post by PuterMan


Thanks for the info and yes guys like you are the true scientists. You research and clarify for nothing else but to educate yourselves and others. Keep up the good work!!!!!

Iceland warns of threat of big earthquake

(Reuters) - Icelandic authorities warned people in the north of the island on Thursday to prepare for a possible big earthquake after the biggest tremors in the area for 20 years.

The north Atlantic island, where almost 320,000 people live, is a hotspot of volcanic and seismic activity as it straddles a fault in the earth's surface.

The Civil Protection Department said in a statement that recent small quakes in an area under the sea about 20 km (12 miles) off the north of Iceland had prompted it to issue a warning to local people.

It said such shocks, one of which was a magnitude 5.6, often led to stronger quakes. Warnings were issued when there were grounds to expect a natural or manmade event that could threaten health and human safety, it added.

Reuters UK

reply to post by Thebel


The Italian Syndrome is alive and well and working in Iceland

Your search parameters are:

catalog=ANSS
start_time=1900/01/01,00:00:00
end_time=2012/10/25,19:32:24
minimum_latitude=65.5
maximum_latitude=67
minimum_longitude=-20
maximum_longitude=-17
minimum_magnitude=6.0
maximum_magnitude=10
event_type=E

No matches to your search criteria

www.ncedc.org...

If there has never in 112 years been a Mag 6 in that area why the warning?

If I lower the magnitude in the search to 5.0 I get

Your search parameters are:

catalog=ANSS
start_time=1900/01/01,00:00:00
end_time=2012/10/25,19:34:59
minimum_latitude=65.5
maximum_latitude=67
minimum_longitude=-20
maximum_longitude=-17
minimum_magnitude=5.0
maximum_magnitude=10
event_type=E

Date Time Lat Lon Depth Mag Magt Nst Gap Clo RMS SRC Event ID
----------------------------------------------------------------------------------------------
1969/05/05 21:47:31.70 66.7770 -18.2370 33.00 5.20 Mb 52 0.00 NEI 196905054016
1973/10/28 11:31:44.10 66.9490 -19.2170 33.00 5.00 Mb 47 0.00 NEI 197310284015
1980/12/25 11:37:27.50 66.4340 -17.7320 10.00 5.10 Ms 92 0.00 NEI 198012254008
1980/12/26 06:02:27.20 66.6630 -17.3280 10.00 5.20 Mb 9 0.00 NEI 198012264009
1994/02/08 03:27:54.90 66.5120 -19.2200 10.00 5.30 Mb 251 1.00 NEI 199402084010
2002/09/16 18:48:26.72 66.9380 -18.4560 10.00 5.80 Mw 454 0.94 NEI 200209164072
2012/10/21 00:10:35.99 66.3870 -18.5810 10.00 5.00 Mb 260 1.04 NEI 201210211001
2012/10/21 01:25:21.91 66.3150 -18.6740 5.40 5.50 Mw 420 0.72 NEI 201210211002

Strange that the ANSS does not have this one in the Centennial Catalogue

1963-03-28T00:15:50.400Z, 66.274, -19.877, 6.8Ms, 15.0000

So now I am even more puzzled. The range in the Centennial is from 6.6 to 7.0 depending on the source and scale. The location is a little away from the current swarm, but not that far.



From the article

Geologist Benedikt Ofeigsson said houses in Iceland could typically withstand quakes of a magnitude about 7.

Guess that should be OK then, but I still think this is a bit of an Italian Job.

I forgot to add, this was the year that Surtsey Island appeared off the South coast of Iceland at Westmannaeyjar. I remember that event very well from the newspaper coverage at the time. I don't however recall any mention of a large earthquake in the North of Iceland.

It does not get a mention here yet it is comparable, in fact larger than, the Skopje quake (6.3) also in 1963.


Stærri skjálftar (>4) á árunum 1706-1990 Basically a list of earthquakes in Iceland over Mag 4.0 between 1706 and 1990.

The 1963 is down as 7.0 and I assume that is ML

OK I have filtered those by the same criteria and what we are left with is:

tími lat lon stærð fjarlægð frá kennileiti
1872-04-18 10:00 66.0 -17.5 6.3 8 km VSV af Húsavík
1872-04-18 11:00 66.2 -17.9 6.3 4 km NV af Flatey
22/01/1910 07:48 66.5 -17.0 7.1 32 km NV af Kópaskeri
02/06/1934 13:43 66.0 -18.5 6.2 3 km NNA af Dalvík
28/03/1963 00:16 66.3 -19.6 7.0 30 km NA af Hrauni_á_Skaga

It would seem that there is a chance of a mag 6+ every 30 years or so which makes it very much overdue for a bigger one. Why in the heck to they not just explain that instead of being so mysterious and making us go and search it out?

Here they are plotted for you.



And finally, is that 1910 M7 one you do not have Muzzy?

Peru just rattled a tad!!

earthquake.usgs.gov...

Originally posted by radpetey
Peru just rattled a tad!!

earthquake.usgs.gov...

A tad is right

Magnitude 5.4
Date-Time

Thursday, October 25, 2012 at 20:49:33 UTC
Thursday, October 25, 2012 at 03:49:33 PM at epicenter
Time of Earthquake in other Time Zones

Location 5.905°S, 76.116°W
Depth 8 km (5.0 miles)
Region NORTHERN PERU
Distances 4 km (2 miles) WSW of Yurimaguas, Peru
72 km (44 miles) NE of Lamas, Peru
79 km (49 miles) NE of Tabalosos, Peru
95 km (59 miles) E of Moyobamba, Peru
Location Uncertainty horizontal +/- 16.2 km (10.1 miles); depth +/- 3.5 km (2.2 miles)
Parameters NST=310, Nph=313, Dmin=677.9 km, Rmss=0.74 sec, Gp=133°,
M-type=body wave magnitude (Mb), Version=6
Source

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

Event ID usb000ddsg

ok head up
M5.2 - 5km W of Morano Calabro, Italy 2012-10-25 23:05:26 UTC
and 4.8 in Philippine and a 4.8 Indian Ridge

More info

Location
39.838°N 16.081°E depth=3.9km (2.4mi)

Nearby Cities
5km (3mi) W of Morano Calabro, Italy
11km (7mi) W of Castrovillari, Italy
21km (13mi) WNW of Cassano al Ionio, Italy
24km (15mi) E of Scalea, Italy
357km (222mi) WSW of Tirana, Albania


earthquake.usgs.gov...

reply to post by Trillium


Little cracker

CUC.MN..BHZ.2012.299

And yet the Maine one was a mag 4?

Originally posted by PuterMan
reply to post by Trillium

 

Little cracker

CUC.MN..BHZ.2012.299

And yet the Maine one was a mag 4?

Ok bit new to this
was looking for the P and S wave indication and could not make it out
or it only happen sometime.

reply to post by Trillium

that seismo must be right on top of the epicentre, there is no P wave just the S wave.

Originally posted by PuterMan
reply to post by Thebel

 

And finally, is that 1910 M7 one you do not have Muzzy?

Yes I had that one

7.0-1910/1/22
Date/Time: 1910/1/22 8:48:30
Lat: 67.5 Long: -17
Location: N of Iceland
Magnitude:
Ms 6.9 [a&n] mB 7.0 [abe]
Unk 7.1 [g&r] Unk 7.2 [b&d]
Depth: - km
Deaths: Injuries:
Tsunami: n/a
Catalog Source: Catalogue of hypocenters and magnitudes 1904-1952, Gutenberg and Richter (1954)

1910 is one of the years I have done down to 6.5.
1910

getting too quiet again, I fear some earthquakes shortly.

reply to post by rickymouse


Maybe around time that storm makes landfall on the coast

didn't spot it posted here,

4.6mb - 87km NE of Nanortalik, Greenland
Gefon have 4.4Mw

not that big, but interesting location
nearest weather info is Nuuk, Light rain. Fog. Chilly.
Temperature: 2 °C
brrrrrr

Tjörnes Fracture Zone activity is still going after 6 days. This is uncommon event. Activity is decreasing, but there is still threat of larger earthquake. There was a rock collapse after Mw5,6 earthquake.

According to Icelandic Meteorological Institute, there is enough stress for Mw6,8 earthquake. Decreasing activity is not sign of that threat is over.

reply to post by muzzy


2°C? Try the middle of Greenland.

Down to -50°C a couple of nights ago. Positively tropical now at -24°C
(Bear in mind this is at an elevation of 10, 500 feet, Summit Station is located at 720 36' North, 380 25' West on the summit of the Greenland ice sheet. The current mbar is 667 because of the height.)

www.summitcamp.org...

Does any one know if there is a fault that runs North and South, along this line of recent 4 mags in Northern Japan??

earthquake.usgs.gov...

reply to post by radpetey


riodb02.ibase.aist.go.jp...

Never used it but it is out there.

Or this 162 page document of Japan seismicity. (Bear in mind when you get to the paragraph on Fukushima that this was written in 2005.)

National Seismic Hazard maps (PDF)

reply to post by PuterMan


As always...Thanks for taking time to post this stuff!!

Very Interesting. As I was downloading the biggie....I had an Adobe acrobat crash Will try later.

Originally posted by Thebel

According to Icelandic Meteorological Institute, there is enough stress for Mw6,8 earthquake. Decreasing activity is not sign of that threat is over.

any links to where you read that?
How they calculate the stress would valuable information