Quake Watch 2011

Originally posted by BobAthome
"The waves are able to reverberate and travel pretty happily out for miles," said U.S. Geological Survey seismologist Susan Hough."

gee why didnt u say they were happy waves,,,

golly i feel so silly now.

What she meant was:
"The waves are able to reverberate and travel with very little attenuation from the hard bedrock out for miles,"

The hard bedrock offers little attenuation to quake waves, so they travel faster and farther than they do on the west coast. MUCH- by a factor of 10 in some places.

FFS! My eQuake is vibrating every few mins - playing peek-a-boo with the 4.2!!

Now there's another just listed - a 3.2... but when I went to view it.. guess what?!!!

Oh.. there is it.. 3.4 now

earthquake.usgs.gov...

First of all, thank you to the veterans of the thread for your efforts and willingness to share of your knowledge and experience, it is very much appreciated! I have learned much from many of you.


My meager contribution:

Mineral was originally known as Tolersville,[3] but adopted its current name when it incorporated in 1902 due to the mining industry that supported the community. It was the center of gold mining activity in Louisa County, and during its heyday, there were fifteen gold mines located within two miles (3 km) of the town. A zinc and lead mine also operated in the area into the 1970s.

So says Wiki

Gold is found in ores made up of rock with very small or microscopic particles of gold. This gold ore is often found together with quartz or sulfide minerals such as Fool's Gold, which is a pyrite.[43]

Wiki again.

I know some have a problem with using Wiki as a source, but for this type of information, I believe it to be sufficiently accurate.

So, there's some possible quartz for you to resonate.

Further there is this:

The Chesapeake Bay has also been identified as one of four anomalous areas along the U.S. East Coast that appear tectonically active. A zone of crustal downwarping and sediment accumulation known as the Salisbury embayment has long been recognized beneath the Delmarva Peninsula. It is clearly possible for vertical movement to occur along such zones. Another geologic factor that might account for anomalous rates of sea-level change, at least for the mouth of the bay, is possible subsidence related to compaction of the fill of a large buried impact crater that underlies much of the Norfolk, Hampton Roads, and Cape Charles area.

USGS Fact Sheet 102-98

Depending on the severity of the impact which created the crater mentioned, there would be a tremendous amount of fracturing in the surrounding bedrock thus allowing for a greater amount of movement from a smaller magnitude quake. Or not?

I really don't know, I've been fascinated by seismology and vulcanology for about as long as I've been able to read, which, you see, has been some time if you're familiar with one of the words I've used in this sentence.

I am concerned that this will shift the stresses within the mid-continental fault system back toward the middle are between Colorado and Virginia, which would be a very bad thing...

reply to post by jadedANDcynical


If an impact loosened bedrock, on the contrary, it would attenuate the waves more- from what I've read. The west coast is largely composed of stuff just like that, loosened rock and soil, and it attenuates quake waves much more efficiently than on the east coast.

Round and round and round she goes,
where she'll stop, nobody knows.

And now Colorado's off again...

.. or did it ever stop?

reply to post by MoorfNZ


Hey! Are you making fun of the USGS, you aussie clone?

GOOD!

I have no idea why all the waffling. They are obviously having some kind of trouble or disagreements.

j/k of course

reply to post by MoorfNZ


Looks like Colorado and Virginia are off again..

Drug Interdictions Map Non-Terror Aviation Incidents NEW - Food/Medicine Incidents NEW - Human Trafficking
DATE/TIME REGION MAGNITUDE DEPTH (in km) DETAIL
Wednesday August 24 2011, 05:07:51 UTC 18 minutes ago Colorado 2.9 5.0 Detail
Wednesday August 24 2011, 04:45:26 UTC 41 minutes ago Virginia 3.4 4.9

reply to post by MoorfNZ


I guess it's time for some screen shots

[atsimg]http://files.abovetopsecret.com/images/member/e34d76d52e59.jpg[/atsimg]

ETA

CO and VA are mirroring each other

This gives me chills

Originally posted by TrueAmerican
reply to post by MoorfNZ

 

Hey! Are you making fun of the USGS, you aussie clone?

GOOD!

I have no idea why all the waffling. They are obviously having some kind of trouble or disagreements.

j/k of course

edit on Wed Aug 24th 2011 by TrueAmerican because: (no reason given)

Oi, I'll have you know I'm a Pom in Godzone!!

reply to post by berkeleygal


Yep Berkleygal - get those screens shot before they change or disappear!

Phase Data and Historical Seismicity thanks to google.

PD - neic.usgs.gov/neis/bulletin/neic_c0005ild_p.html

HS - neic.usgs.gov/neis/bulletin/neic_c0005ild_h.html

Cached and screenshot

webcache.googleusercontent.com/search?q=cache%3Aearthquake.usgs.gov%2Fearthquakes%2Frecenteqsww%2FQuakes%2Fusc0005ild.php&hl=en

My house just shook!!

cat jumped off my lap

and I have four Furby's in a box and it shook one of them awake!

brb

Magnitude
? (uncertain or not yet determined)
Date-Time
Wednesday, August 24, 2011 at 06:36:54 UTC
Tuesday, August 23, 2011 at 11:36:54 PM at epicenter
Location
37.747°N, 122.139°W
Depth
8.2 km (5.1 miles)
Region
SAN FRANCISCO BAY AREA, CALIFORNIA
Distances
4 km (3 miles) NNE (17°) from San Leandro, CA
7 km (4 miles) NW (313°) from Castro Valley, CA
8 km (5 miles) N (357°) from San Lorenzo, CA
9 km (6 miles) SE (124°) from Oakland, CA
Location Uncertainty
horizontal +/- 0.3 km (0.2 miles); depth +/- 0.8 km (0.5 miles)
Parameters
Nph= 25, Dmin=5 km, Rmss=0.1 sec, Gp= 68°,
M-type="Nuttli" surface wave magnitude (mbLg), Version=0
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71625060

Magnitude
3.9
Date-Time
Wednesday, August 24, 2011 at 06:36:54 UTC
Tuesday, August 23, 2011 at 11:36:54 PM at epicenter
Location
37.748°N, 122.137°W
Depth
9.1 km (5.7 miles)
Region
SAN FRANCISCO BAY AREA, CALIFORNIA
Distances
4 km (3 miles) NNE (19°) from San Leandro, CA
7 km (4 miles) NW (314°) from Castro Valley, CA
8 km (5 miles) N (358°) from San Lorenzo, CA
10 km (6 miles) ESE (123°) from Oakland, CA
Location Uncertainty
horizontal +/- 0.2 km (0.1 miles); depth +/- 0.5 km (0.3 miles)
Parameters
Nph= 86, Dmin=5 km, Rmss=0.14 sec, Gp= 32°,
M-type=local magnitude (ML), Version=2
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71625060

wow really

so its a preliminary 3

oh, 3.9 (ninjaed)

reply to post by ignant


wow

well, there was a small tremor, which alerted me, then 2 secs later a big shake

I watched the water slosh in the fish tank

Earlier this evening my left ear was ringing, about 3-4 times, then an hour ago my right ear rang, real loud. Now I feel a bit queasy

ETA

there was an aftershock 5 minutes later, I did not feel that

2.3 2011/08/24 06:41:53 37.753 -122.141 8.4 5 km ( 3 mi) NNE of San Leandro, CA
3.6 2011/08/24 06:36:54 37.748 -122.137 9.1 4 km ( 3 mi) NNE of San Leandro, CA

reply to post by berkeleygal


All of which are taking place close to the 37 degree latitude line


Things that make you go hmmm

37 degrees north ore 37 degrees south are both rings of EQ's round the world.......

could be connected with convection streams under the earth crust......same as wheater streams and ocean flows

cancel
2nd

3.0 2011/08/24 07:15:58 37.092 -104.874 5.0 COLORADO
3.6 2011/08/24 06:36:54 37.748 -122.137 9.1 SAN FRANCISCO BAY AREA, CALIFORNIA
2.9 2011/08/24 05:07:52 37.185 -104.702 5.0 COLORADO
3.4 2011/08/24 04:45:27 37.925 -77.994 4.9 VIRGINIA
2.6 2011/08/24 02:40:40 37.111 -104.633 5.0 COLORADO
4.2 2011/08/24 00:04:37 37.912 -77.951 7.9 VIRGINIA

CO just had another

Magnitude
3.0
Date-Time
Wednesday, August 24, 2011 at 07:15:57 UTC
Wednesday, August 24, 2011 at 01:15:57 AM at epicenter
Location
37.092°N, 104.874°W
Depth
5 km (3.1 miles)
Region
COLORADO
Distances
34 km (21 miles) WSW of Trinidad, Colorado
43 km (26 miles) WNW of Raton, New Mexico
59 km (36 miles) S of Walsenburg, Colorado
294 km (182 miles) S of DENVER, Colorado
Location Uncertainty
horizontal +/- 11.5 km (7.1 miles); depth +/- 3.1 km (1.9 miles)
Parameters
NST= 25, Nph= 29, Dmin=188.1 km, Rmss=1.66 sec, Gp= 58°,
M-type=local magnitude (ML), Version=7
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usc0005iw4

earthquake.usgs.gov...