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SAN FRANCISCO, California (CNN) -- A magnitude 4.7 earthquake and multiple aftershocks shook the south San Francisco Bay Area on Thursday morning.
The effects were felt in a 28-mile radius.
The earthquake, which the U.S. Geological Survey deemed "light," happened at 5:24 a.m. PT.
Its epicenter was six miles east of San Martin and eight miles northeast of Gilroy, a town about 30 miles southeast of San Jose.
"You won't have much damage from a quake this size," said Bob Johnson, a geographer with the U.S. Geological Survey.
No one was hurt, and there were no reports of damage, according to police officers in nearby Santa Cruz and Santa Clara counties.
Aftershocks of up to magnitude 2.0 followed.
The 1989 Loma Prieta earthquake, with a magnitude of 7.1, caused widespread damage and more than 60 deaths in the Bay Area.
Originally posted by thecandyman
thanks justgeneric... we contacted USGS last night about all this activity in Alaska and they got back to us pretty fast... saying that these are indeed individual quakes and that they are keeping a close eye on the 'situation'. And I believe that d1k just emailed them again. Hopefully we will hear something more about it tonight. My opinion, the more the merrier... email someone and see what ya hear. The more info we can get the better. Even if nothing does happen big... this has been pretty fun to watch. I know i've never seen this many quakes before.
Magnitude ? (uncertain or not yet determined) - NORTHERN CALIFORNIA
2006 June 16 10:58:06 UTC
Location 40.706°N, 122.374°W
Depth 20.1 km (12.5 miles)
Region NORTHERN CALIFORNIA
Distances 3 km (2 miles) N (354°) from Shasta Lake, CA
14 km (9 miles) N (359°) from Redding, CA
21 km (13 miles) NW (326°) from Palo Cedro, CA
251 km (156 miles) NNW (342°) from Sacramento, CA
Originally posted by thecandyman
Well, they are mostly in the same area... but as you can see by the posts and also by looking on the USGS site, there seems to be increased activity all over the world. But yes, most of the ones in Alaska are all within close distance to one another. Not really moving in a pattern.
From: Michael L Strobel [email@example.com]
Sent: June 16, 2006 8:28 AM
Subject: Re: Recent quakes in Alaska
Thee are good questions, and I have had other similar questions today on the
topic. I will copy an earlier answer I gave and hope this helps you:
"Because you live in an area of much seismic activity and because you look at
our website (thanks), you are probably well aware of changes in the rates and
intensity of earthquakes. The entire Pacific Rim (also referred to as the Ring
of Fire by some) along the South American and North American continents, along
the Aleutian Islands, and down the eastern edge of Asia, is one of much
seismic activity because of the subduction of the Pacific plate beneath
continental plates. Plate movement and subduction is the movement of one rock
mass against another, and because of the friction involved, the movement is
not always at a constant rate. Often, pressure will build up and then release
as the plates shift relative to one another, causing periods of increased
activity, and in some cases, larger magnitude earthquakes. You are correct in
that there often is an increase in seismic activity prior to volcanic events,
but there are many other factors and indicators that need to be considered
when making predictions about volcanism and increased seismic activity in
itself may just mean normal plate movement. I encourage you to explore our
webpage on volcanoes to
learn more at volcanoes.usgs.gov... and about earthquakes at
earthquake.usgs.gov... (which, if you are using our real-time
data, you are probably already aware of this site) (some of the links for
students on this site are wonderful and have powerpoint presentations on
various topics of interest). Information about plate tectonics can be found at
A link that may answer some of your questions is at
I believe the information you are using is at the following link, but if not,
you may wish to check this out:
Because of the specific nature of your questions to Alaska, I would suggest
you contact our Geological Science office in Anchorage directly and ask an
expert in this area. The link to the directory is
alaska.usgs.gov... and someone there can
provide you with better answers than my generalized discussion.
I hope this helps.
Michael L. Strobel, PhD
Deputy Director, USGS Nevada Water Science Center 2730 N. Deer Run Road Carson
City, NV 89701
"The highest reward for a person's toil is not what they get from it, but what
they become by it" -John Ruskin
Hello, I have been watching the recent activity in Alaska at the Rat Islands
and was wondering if you would be so kind as to answer a few questions I have.
We are up to 115 quakes that have been coming steady for the past day and a
half now. Is this normal for this region to have constant and steady quakes
every 15-60 minutes for so long? Is this prolonged activity the norm for
movement of the subducting plate? Or could this be one the dormant volcano’s
Kanaga or Moffett waking up?
From my limited knowledge the number of magnitude 3+ quakes is well above the
average with this activity and has even seen two 6.0+ quakes thirty minutes
apart when the average is five a year for the state (according to
Any insight on the situation would be greatly appreciated.
Thanks for your time.
Originally posted by Dr X
Could be due to Haarp? What do you think?
Strange how all the Earthquakes have been in muslim countries recently isn't it?