Quake Watch 2011

reply to post by Aromaz


Thanks for the link.

Added to my links page (Africa and Oceania) for future reference.

Originally posted by PuterMan
reply to post by muzzy

 

And double doh muzzy!!

www.abovetopsecret.com...

Oh, indeed

Surprised that I didn't get an email notification for the +5. Must be waiting for it to be reviewed?
earthquake.usgs.gov...

Magnitude 5.2 - KENAI PENINSULA, ALASKA
2011 June 16 19:06:05 UTC


This event has been reviewed by a seismologist.
Magnitude
5.2
Date-Time
Thursday, June 16, 2011 at 19:06:05 UTC
Thursday, June 16, 2011 at 11:06:05 AM at epicenter
Location
60.765°N, 151.048°W
Depth
57.4 km (35.7 miles) set by location program
Region
KENAI PENINSULA, ALASKA
Distances
13 km (8 miles) ENE (61°) from Nikiski, AK
24 km (15 miles) NE (37°) from Salamatof, AK
25 km (16 miles) NNE (23°) from Kenai, AK
84 km (52 miles) SW (236°) from Anchorage, AK
Location Uncertainty
horizontal +/- 0.3 km (0.2 miles); depth fixed by location program
Parameters
NST= 76, Nph= 85, Dmin=10.6 km, Rmss=0.75 sec, Gp= 47°,
M-type=local magnitude (ML), Version=2
Source
Alaska Earthquake Information Center
Geophysical Institute, University of Alaska Fairbanks
Event ID
ak10253162

Type: Earthquake
44 minutes ago
Magnitude: 4.9
DateTime: Friday June 17 2011, 02:22:24 UTC
Region: Queen Charlotte Islands, Canada region
Depth: 13 km


Queen Charlotte's acting up again

OK, NABRO is not done with its arguement:

Mag 5.5 Friday, June 17, 2011 at 09:16:12 UTC

Not yet on Djibouti or EMCS

Second Nabro quake today reported:

Update on first quake as per Djibouti Observatory:
DATE: 17 June 2011
TIME: 09h16
MAGNITUDE: 5.8
LOCATION: LAT 13.39 LON 41.67
DEPTH: 4.67 Km

NEW QUAKE:
DATE: 17 June 2011
TIME: 10h05
MAGNITUDE: 4.3
LOCATION: LAT 13.41 LON 41.65
DEPTH: 8 Km

No new volcanic (Eritrea/Ethiopia) activity as of yet on any SAT photos until 11h45 UTC time.

www.sfgate.com.../c/a/2011/06/16/BAVR1JTA9H.DTL&type=science

www.dailymail.co.uk...

reply to post by Aromaz


USGS only reporting one quake today

Magnitude 5.5
Date-Time
Friday, June 17, 2011 at 09:16:12 UTC
Friday, June 17, 2011 at 12:16:12 PM at epicenter
Time of Earthquake in other Time Zones
Location
13.307°N, 41.668°E
Depth
10 km (6.2 miles)
Region
ERITREA - ETHIOPIA REGION
Distances
120 km (74 miles) WNW of Assab, Eritrea
215 km (133 miles) SW of Al Hudaydah, Yemen
238 km (147 miles) E of Mekele, Ethiopia
371 km (230 miles) SE of ASMARA, Eritrea
Location Uncertainty
horizontal +/- 17.3 km (10.7 miles); depth +/- 2.7 km (1.7 miles)
Parameters
NST=161, Nph=165, Dmin=326.2 km, Rmss=1.13 sec, Gp= 65°,
M-type=regional moment magnitude (Mw), Version=6
Source
USGS NEIC (WDCS-D)
Event ID
usc00049uf

earthquake.usgs.gov...

Christchurch Earthquakes

Like many Christchurch residents are I am also wondering when the earthquakes in Canterbury are going to end.
I am thinking that this is in fact a Swarm, because of the migrating nature of the aftershocks to the east

Reminds me of the Weber 1, 2, 3 & 4 quakes of 1990-92 in the Manawatu Province,.over to the east of where I live in the North Island
Very similar situation, although the first one wasn't a Mag 7, and therefore there have been a lot more low Mag 5's in the Canterbury series.
The Weber series went 6.2Mw, 6.4Mw, 5.2Mw and 5.7ML

Weber 1, 2 ,3, 4 Swarm
A series of four large earthquakes with epicenters very close to one another occurred in 1990–1992 in the Weber region of the southeast coast of the North Island. The region is one of oblique plate convergence and subduction, the plate interface being at about 20 km depth.
The first event in the Weber sequence was the M6.2 Weber I in Feb. 1990, which faulted the plate slab steeply down to the northwest. That was followed 3 months later by the M6.4 Weber II event, which was a southeast-directed thrust entirely above the plate interface.

Weber 1:
The first event, on February 19, 1990 at 05:34:37 UTC, a 5.944ML, 6.2Mw, at a depth of 33.8km, occurred within the upper part of the subducting Pacific plate on a steeply northwest dipping normal fault, as defined by relocated aftershocks. .The time history of the aftershocks of the first (deeper) event shows a period of quiescence beginning 35 days before the second (shallow) event in May.
Between the main shock on the 19th February and the 2nd event on the 13th May in the approx. 50km radius triangular area between Dannevirke in the north west, Pourerere in the north east and Owahanga in the south there were 1354 aftershocks, 7 between 4.016ML and 4.899ML , 111 between 3.001ML and 3.989ML, 872 between 2.002ML and 2.992ML and 363 between 1.209ML and 1.999ML. The majority of the smaller aftershocks were 4-16km northwest of Weber or 15-22km north west of the main shock., although there were approx. 23 events further to the west 14-15km east of Ekatahuna running in a north south line north of Alfredton, including a 4.553ML.

Weber 2:
The second event, May 13, 1990, 6.2ML, 6.5Ms, 6.4 Mw, occurred on an imbricate fault in the overlying Australian plate, dipping shallowly northwest, with components of both thrusting and dextral strike-slip motion. It was located 5.41km (3.4 miles) north east of the February Weber 1 event at a depth of 30km.
There were 441 aftershocks in the first 24 hours, the largest being a 5.055ML 17.6km to the north west, at a depth of 26.4km, subsequent to and 3 minutes after the mainshock, and 29 events between 4.003ML and 4.791ML by August 1st, 22 of them in the first 16 hours.
Through till 15th August 1990 there were 235 aftershocks between 3.0ML and 3.969ML, 718 events 2.003ML to 2.994ML and 563 events 0.357ML to 1.995ML. In total there were 1546 aftershocks before the Weber 3 5.7ML struck on 15th August 1990.
It appears that the first earthquake (Weber 1) , in the lower plate, produced additional loading that induced the second. This interactive relationship is also evident in the aftershocks of the May event, many of which were located near to the Feb 19 hypocentre.

News Item 13 May 1990 Weber 2 earthquake:
At 4:23 pm on Mother’s Day, 13 May 1990, a magnitude 6.5 earthquake struck the southern Hawke’s Bay near Weber, east of Dannevirke. It was just 10 kilometres from the epicentre of a magnitude 6.1 Mwearthquake on 19 February, a few months earlier. Some houses were cracked, or knocked off their foundations. Many buildings in Dannevirke had broken windows and cracked chimneys. At Cape Kidnappers, a group of about ten people walking along the shore had a near miss when a large slip from the coastal cliffs fell near them. Within 24 hours of the main earthquake, there were 7 aftershocks of magnitude 5 Mw or greater.

Weber 3:
The third smaller Weber 3 earthquake occured on August 15, 1990 at 15:54:43.4 UTC, was a 5.7ML, 4.8Ms, 5.17Mw at a depth of 41.7km and extended the aftershock zone of the deeper first main shock to the northeast, matching the extent of the shallower second 6.2ML Weber 2 shock. In the 122 days following, to the end of 1990, there were 4 aftershocks 4.062ML to 4.777ML, 45 events 3.001ML to 3.937ML, 285 events 2.012ML to 2.995ML and 21 events 1.662ML to 1.981ML

Weber 1991
From the beginning of Jan 1991 in the 14 months through to 1st March 1992 the area was relatively light with earthquake activity, with only 351 total events, 4 from 4.205ML to 4.381ML, 65 from 3.015ML to 3.92ML, 278 from 2.044ML to 2.999ML and 3 at 1.921ML, 1.969ML and 1.977ML

1992 Weber 4:
"Weber 4" 5.7ML occured on 1992-03-02 09:05:57 UTC, the 4th event in a sequence starting on February 19, 1990, with a 5.9ML ( Mw 6.2). The second event, May 13, 1990 a 6.2ML(6.4Mw), and the 3rd event August 15, 1990 a 5.7ML.

The Weber 4 earthquake epicentre was closer to the coast than the previous 3 quakes, it was 7.2km east of Weber 3 at a depth of 37km.

There were 406 aftershocks in the 30 days following, the largest a 5.016ML event on the 13th March at Lat -40.26044 Long. 176.49117, 21.07km to the north west of the main shock. There were 138 aftershocks from 1.004ML to 2.819 in the immediate area of the mainshock, the remaining 268 aftershocks spread in two main areas in a SW to NE direction, one near the 1990 Weber 3 earthquake and the others 20 km north east of Weber village. Of those there were 2 aftershocks 4.216ML and 4.392ML, 17 between 3.004ML and 3.976ML 186 events 2.005ML to 2.993ML and 62 events 0.453ML to 1.989ML

source 1990 NZ quakes
source 1992 NZ quakes

I may start calling the
2010 Darfield 7.1 - Canterbury 1
2011 Feb 21st 6.3 - Canterbury 2 (which had a 5.6 foreshock)
2011 June 12th 6.3 - Canterbury 3

Based on Weber, there is a very good chance this situation in Canterbury could go on for years.
Then again it could taper off tommorrow.
No one knows.



What caught my eye when reading this again ( I wrote it in 2008 ) was the sentence "It appears that the first earthquake (Weber 1) , in the lower plate, produced additional loading that induced the second. This interactive relationship is also evident in the aftershocks of the May event, many of which were located near to the Feb 19 hypocentre."

I think this is what is happening in Christchurch.


Or should the other big quake, the Boxing Day 5.7 be included as Canterbury 2 and the other 2 shifted down a number
Although the MSM say that one was a Darfield Aftershock, EQC class it as a seperate earthquake for Insurance Claims


What makes it confusing at this stage (in Canterbury) is that although there are distinct clumps of aftershocks for each event, there are also quakes still going on in the original area of the others ie Hororata or Oxford Hill quakes (aftershocks of the Sept 4) at the same time as Lyttelton quakes (aftershocks of the Feb 21)
So far I have named the Aftershocksof the 7.1 and 1st 6.3 by drawing a line on the fringes of Christchurch urban area (Halswell). Seperating the 1st 6.3 aftershocks from the 2nd 6.3 aftershocks is going to be harder geographically as time goes on now.

EMSC reporting a 3.8 at Katla

www.emsc-csem.org...

See Vedur - 3.1 below.

www.abovetopsecret.com...

Hi, I'm a newbie but have been following this thread for a while now. Moving to New Zealand, played a part in that I guess.

I'm not a scientist or geologist or anything near, I'm just very curious and like everybody in NZ I've been following the events in Christchurch and the rumours surrounding them especially the talk about the "extinct" volcanoes there. It reminds me of Montserrat and what happened there in the ninetees. They had three years of hightened seismic activity and then their "extinct" volcano erupted.

Thanks

reply to post by Anneke


Yes, but also think about when Monserrat previously erupted and when Banks Peninsula was previously active and you'll see there is a big temporal discrepancy.

reply to post by Anneke

Welcome on board.

Hi

I have no qualifications in geology or the skills the quote/embed on here, I have been watching this thread for the last couple of days waiting for someone to mention the Papua New Guinea quakes (New britain Region)

A 6.6 after 8 x 4+ in one day, is this an abnormal swarm or so normal to this area that I have missed the origins of it as I have only been quake watching since January?

reply to post by TeresaDarling


Yes I guess that the reason no one has mentioned it is basically because it is not extraordinary for that region.

Rather than re-post please take a look at the 2 years graphs I did yesterday when someone mentioned PNG in another thread.

You can see from them that things have been pretty steady over that period of time.




Just managed to catch this for editing to add this graph of the energy in GJ since 01/01/2005 to present. (Even though the 4+ quakes of today were in the ANSS catalogue the 6.6 ws not!)



The Mag 7.3 last year in July dominates the energy output for the 6 years. In fact the three largest quakes in the last 6 years are at this point in time.

18/07/2010 13:04:09 -5.966 150.428 28 6.9 Mw
18/07/2010 13:34:59 -5.931 150.59 35 7.3 Mw
04/08/2010 22:01:44 -5.746 150.765 44 7 Mw



Here are the magnitudes:

reply to post by muzzy


I'm really concerned too. I think we're possibly just beginning here! They keep moving east - heading for the chatham rise and there are some BIG faults out there! Is it possible that we're just starting the giggle of the west end of those faults?

reply to post by TeresaDarling


This one is quite interesting as well. 1964 to today Mag 6+

Originally posted by Anneke
Hi, I'm a newbie but have been following this thread for a while now. Moving to New Zealand, played a part in that I guess.

I'm not a scientist or geologist or anything near, I'm just very curious and like everybody in NZ I've been following the events in Christchurch and the rumours surrounding them especially the talk about the "extinct" volcanoes there. It reminds me of Montserrat and what happened there in the ninetees. They had three years of hightened seismic activity and then their "extinct" volcano erupted.

Thanks

Not to create fear; This has absolutley NOTHING to do with NZ !

I recently updated on Volcano Watch;
What was never thought as volcano, just normal mountain yesterday erupted in Somaliland
I walked there and vistied some caves back in 2002/3/4 and there were absolute no indications of any magma flow - at least for millions of years.

Originally posted by Evltre
reply to post by muzzy

 

I'm really concerned too. I think we're possibly just beginning here! They keep moving east - heading for the chatham rise and there are some BIG faults out there! Is it possible that we're just starting the giggle of the west end of those faults?

funny you mention the Chathams, there was a 3.6 way out there the same day as the Moncks Bay 6.3.
Pretty rare
A lot of people forget that the core mass of Zealandia is about 4 times what is above sea level.

Something 5ish happened down here 2:30ish UTC.
Its on SNZO, Scott Base and the South Pole, faintly at Charters Towers, Queensland too.
Nothing on any Networks yet.
on LISS now
Can't load images on ATS right now for some reason

Another mystery Southern Ocean quake