Quake Watch 2011

reply to post by spinkyboo


I just spotted that one.

This morning as I was looking at the quakes on usgs I noticed a LOT of tiny quakes, all pretty small on the west coast..then a couple mid to upper 4's...then tiny ones again...it was quite unusual. I thought to myself.."I wonder if a bigger one is coming at some point today" There it is

Originally posted by summer5
reply to post by spinkyboo

 

I just spotted that one.

This morning as I was looking at the quakes on usgs I noticed a LOT of tiny quakes, all pretty small on the west coast..then a couple mid to upper 4's...then tiny ones again...it was quite unusual. I thought to myself.."I wonder if a bigger one is coming at some point today" There it is

Ah, Yep - and of course on the West Coast here many of us are in constant anticipation of the "big one".
So, when these big ones shake on the other side, we can only imagine what's really going on below the surface.

And another following...same location.
Saturday August 20 2011, 17:13:07 UTC 16 minutes ago Vanuatu 5.9 37.3
quakes.globalincidentmap.com...

5.7 aftershock

Magnitude mb 5.7
Region VANUATU
Date time 2011-08-20 17:13:13.0 UTC
Location 18.35 S ; 168.07 E
Depth 79 km
Distances 1094 km W Suva (pop 199,455 ; local time 05:13:13.7 2011-08-21)
72 km S Vila (pop 35,901 ; local time 04:13:13.7 2011-08-21)



www.emsc-csem.org...

Rainbows
Jane

And another? Any tsunami warning?

Magnitude mb 5.9
Region VANUATU
Date time 2011-08-20 17:13:08.0 UTC
Location 18.32 S ; 168.14 E
Depth 40 km
Distances 1087 km W Suva (pop 199,455 ; local time 05:13:08.0 2011-08-21)
67 km S Vila (pop 35,901 ; local time 04:13:08.0 2011-08-21)

Rainbows
Jane

Anyone know yet if it was ,,gravel off the side,
or slip,,
down?
or up?
or under sea volcano?

And another, at least they are going down in strength if not depth

Magnitude M 5.1
Region VANUATU
Date time 2011-08-20 17:44:27.3 UTC
Location 18.77 S ; 167.92 E
Depth 10 km
Distances 1111 km W Suva (pop 199,455 ; local time 05:44:27.3 2011-08-21)
122 km S Vila (pop 35,901 ; local time 04:44:27.3 2011-08-21)

Rainbows
Jane

reply to post by angelchemuel


167.92 E could be,,1.8 mile,, fissure,

Where's PuterMan?????
Or Mr Marks?????

Rainbows
Jane

reply to post by PuterMan


Thanks for the links, its good to have them all in one place.
That graph is great, shows the limits of each type very well.
In the first pdf link, by Kanamori
Page 11
"As mentioned earlier, the process involved in earthquakes is very complex so that we obviously need more than one perameter for detailed description of siesmic events"
Thats why I started searching and sourcing multiple magnitude types for the Mag7+Project and putting them on the map icon popup tags.
Historic quakes don't always have Mw. Ms is more commonly available as is mb. Me and ML used very occasionally .A lot of the data from NOAA and IISEE don't give the magnitude type at all so I have alloted the type name of Unk for unknown.
I notice in the 2nd link you put up that McCalpin says about his research "If the magnitude type is unknown or unspecified, it is cited as Mw", I'm not sure I'd want to do this though as it could get confusing prior to 1900. Also mentioned in that pdf is the description of Mblg which you often see on USGS pahse data , good to 1000km aparently.
I wonder what the difference is bewteen mb and mB which you also see on the phase data from USGS.

On my interactive maps each icon has to have a number of some sort, because of the way the GPS programme is set up and the way Google Earth works, so I have selected the largest value for each event regardless of the magnitude type., but tried not to put on "Unk" type too much, unless thats the only data available.
E.R Engdahl and A. Villaseñor have done a fantasic job with the 1900-1999 Centennial List converting these historic quakes to Mw, the years outside those are a bit more work though.
This last week I have also been re writing the lists that go with each years map, adding the magnitude type and the source and catalogue, its taken a lot of time as I have had to rewrite the headers on the csv files and move stuff about to get the GPS programme to pick up the right columns
When I started to include data from the Centennial List I ended up with two different templates (layouts) for the csv files 1910 -1949 and 1976-2011 were different than 1949-1976, so I have to go through year by year to alter them to the same layout.
Its going to get harder and harder pre 1900 as so many earthquakes were only measured in Intensity (MM) which is a human perception, we all know that "witnesses" often give two completely different descriptions of the offender, like in this page on EMSC which I usually get a smile out of - example www.emsc-csem.org...

In conclusion, having read the links you put on, I can see why they change the magnitudes from mb to Mw, and realise it takes a bit of time for them to work it out.

It seems USGS will convert mb to Mw above 5.4 (i just went through the 7 days list to check) but not always. 5.6 aftershock Vanuatau just now still in mb. WIll be interesting to see if and how long it takes for them to convert

No Tsunami?
ptwc.weather.gov...

Good, now I can watch the All Blacks play South Africa in SA on TV without having to monitor the radio for tsunami warnings.
Wasn't planning to go down to the beach this morning anyway, its only 4.4C outside

Another.....5.2

Magnitude mb 5.2
Region VANUATU
Date time 2011-08-20 18:02:00.0 UTC
Location 18.58 S ; 168.05 E
Depth 30 km
Distances 1096 km W Suva (pop 199,455 ; local time 06:02:00.8 2011-08-21)
97 km S Vila (pop 35,901 ; local time 05:02:00.8 2011-08-21)

Rainbows
Jane

Date/Time UTC,Latitude,Longitude,Magnitude,Depth(Km),Location
2011-08-20 18:19:21, -18.343, 168.156, 7.0, 2.0, Vanuatu
2011-08-20 18:19:28, -18.200, 168.016, 7.4, 36.2, Vanuatu

It's rolling.

Downgraded 7.5

Date/Time UTC,Latitude,Longitude,Magnitude,Depth(Km),Location
2011-08-15 13:56:44, -17.394, 168.373, 4.6, 35.0, Vanuatu
2011-08-15 15:20:07, -16.955, 171.577, 4.8, 10.0, Vanuatu Region
2011-08-20 09:50:18, -18.552, 168.089, 5.1, 35.1, Vanuatu
2011-08-20 16:55:02, -18.260, 168.069, 7.1, 40.6, Vanuatu
2011-08-20 17:11:35, -18.289, 167.754, 5.6, 40.9, Vanuatu
2011-08-20 17:13:07, -18.286, 168.062, 5.9, 37.3, Vanuatu
2011-08-20 17:44:27, -18.770, 167.923, 5.1, 9.5, Vanuatu
2011-08-20 18:02:00, -18.608, 167.909, 5.2, 35.3, Vanuatu
2011-08-20 18:19:21, -18.343, 168.156, 7.0, 2.0, Vanuatu
2011-08-20 18:19:28, -18.200, 168.016, 7.4, 36.2, Vanuatu

I think we need to wait until these settle. There will be some adjustments I feel.




Yes downgrades and adjustments:

Date/Time UTC,Latitude,Longitude,Magnitude,Depth(Km),Location
2011-08-15 13:56:44, -17.394, 168.373, 4.6, 35.0, Vanuatu
2011-08-15 15:20:07, -16.955, 171.577, 4.8, 10.0, Vanuatu Region
2011-08-20 09:50:18, -18.552, 168.089, 5.1, 35.1, Vanuatu
2011-08-20 16:55:02, -18.260, 168.069, 7.1, 40.6, Vanuatu
2011-08-20 17:11:35, -18.289, 167.754, 5.6, 40.9, Vanuatu
2011-08-20 17:13:07, -18.286, 168.062, 5.9, 37.3, Vanuatu
2011-08-20 17:44:27, -18.770, 167.923, 5.1, 9.5, Vanuatu
2011-08-20 18:02:00, -18.608, 167.909, 5.2, 35.3, Vanuatu
2011-08-20 18:19:21, -18.343, 168.156, 7.0, 2.0, Vanuatu

7.0 2011/08/20 18:19:21 -18.343 168.156 2.0 VANUATU another one

well at least Fukushima should be safe,,

18.343°S, 168.156°E ,,,second quake,,((1.2 miles)
18.260°S, 168.069°E ,,,first quake,,,(25.2 miles)

something is moving upwards,,
or
shelf above ,

7.0

Magnitude Mw 7.0
Region VANUATU
Date time 2011-08-20 18:19:23.0 UTC
Location 18.37 S ; 168.16 E
Depth 10 km
Distances 1085 km W Suva (pop 199,455 ; local time 06:19:23.1 2011-08-21)
72 km S Vila (pop 35,901 ; local time 05:19:23.1 2011-08-21)

Rainbows
Jane

ooops sorry Bob!
Rainbows
Jane

reply to post by angelchemuel


no, ALWAYS POST the information,,,, mine is different from yours,, slightly different,, post away,
always,,

I am seeing this:

aturday August 20 2011, 18:40:56 UTC 5 minutes ago Northern California 2.8 25.6 Detail
Saturday August 20 2011, 18:19:27 UTC 27 minutes ago Vanuatu 7.4 36.0 Detail
Saturday August 20 2011, 18:19:21 UTC 27 minutes ago Vanuatu 7.0

7.4 following the 7.0

With the varying depths from Vanuatu, are these volcanic? Or foreshocks?

?

Originally posted by lasertaglover
With the varying depths from Vanuatu, are these volcanic? Or foreshocks?

?

Good question!

I was having the same thoughts...