[QUOTE=only_human;339870]Here is another local earthquake that I just felt.
M 3.0 2013/05/09 14:08:03 33.959N 118.425W 13.0 2 km ( 1 mi) NE of Los Angeles Airport, CA[/QUOTE]Those last two are almost exactly in the same spot.

[QUOTE=Uncwilly;339886]Those last two are almost exactly in the same spot.[/QUOTE]Interesting. Well that may also have a selection bias because I was in the same spot each time when I felt them. For all I know there may been a few of these little guys not quite as nearby.

Today’s Earthquake Fact (via [url]http://earthquake.usgs.gov/earthquakes/[/url] )

Each year the southern California area has about 10,000 earthquakes. Most of them are so small that they are not felt. Only several hundred are greater than magnitude 3.0, and only about 15-20 are greater than magnitude 4.0. If there is a large earthquake, however, the aftershock sequence will produce many more earthquakes of all magnitudes for many months.

This latest one that I've just felt is a different spot but close and stronger.
[CODE] MAG DATE LOCAL-TIME LAT LON DEPTH LOCATION
y/m/d h:m:s deg deg km

3.9 2013/05/15 13:00:06 33.652N 118.385W 0.1 10 km ( 6 mi) SW of Pt. Fermin, San Pedro, CA[/CODE]
Don't want any stronger ones.
[url]http://www.data.scec.org/recenteqs/Maps/118-34.html[/url]

We once had a fiver here -- on the closer of the underwater fault lines outside of the San Diego bay:
[url]http://www.data.scec.org/recenteqs/Maps/118-33.html[/url]
but I cannot find its records in the SCEC database. That one was felt quite well, probably stronger than Hector Mine (which was a sevener, but distant).

[QUOTE=only_human;340597]This latest one that I've just felt is a different spot but close and stronger.
[CODE] MAG DATE LOCAL-TIME LAT LON DEPTH LOCATION
y/m/d h:m:s deg deg km

3.9 2013/05/15 13:00:06 33.652N 118.385W 0.1 10 km ( 6 mi) SW of Pt. Fermin, San Pedro, CA[/CODE]
Don't want any stronger ones.
[url]http://www.data.scec.org/recenteqs/Maps/118-34.html[/url][/QUOTE]

I live in the SF bay area (i.e. NoCal rather than SoCal) and today is my birthday but nothing seismically notable here today ... so I'm claiming the above as my personal "birthquake". :)

Happy birthquake to you!
Happy birthquake to you!
Happy birthquake, dear Ernst!
Happy birthquake to you!

Did you blow out all the candles on the seismometer with one breath?

[QUOTE=cheesehead;340644]Happy birthquake to you!
Happy birthquake to you!
Happy birthquake, dear Ernst!
Happy birthquake to you!

Did you blow out all the candles on the seismometer with one breath?[/QUOTE]

Is that what that thing was? I thought it was, like, one of of [url=http://www.imdb.com/title/tt0833632/]those Polygrip tests[/url], and kept trying to hold my breath to keep it from busting me for lying about my age. :)

:-D

In the last 24 hours:
[URL="http://earthquake.usgs.gov/earthquakes/eventpage/usb000h4jh#summary"]8.2 - Sea of Okhotsk (off shore of Russia)[/URL]
[URL="http://earthquake.usgs.gov/earthquakes/eventpage/usb000h3k3#summary"]7.4 near Tonga[/URL]
[URL="http://earthquake.usgs.gov/earthquakes/eventpage/nc71996906#summary"]5.7 Northern California[/URL]

[QUOTE=Uncwilly;341416]In the last 24 hours:
[URL="http://earthquake.usgs.gov/earthquakes/eventpage/nc71996906#summary"]5.7 Northern California[/URL][/QUOTE]Did not feel the big shaker, but did feel two of the aftershocks (the 2.5 and the 4.9). As of now there have been a total of 37(!) quakes in the last 5 hours in one small location greater than magnitude 2.5.

Check out this [URL="http://earthquake.usgs.gov/earthquakes/map/"]page[/URL] and zoom in to NE California around Lake Almanor.....

[URL="http://news.yahoo.com/big-earthquakes-create-global-scale-gps-errors-144104992.html"]Big Earthquakes Create Global-Scale GPS Errors[/URL][QUOTE]Thirteen years of supersized earthquakes, such as today's (May 24) magnitude-8.3 in Russia, have contaminated GPS sites around the world, a new study finds.[/QUOTE][QUOTE]Tregoning and his colleagues modeled the sudden jolts in Earth's crust from each of the 15 biggest earthquakes since 2000. They discovered that crust thousands of miles away from the faults had moved horizontally by as much as a tenth of an inch (a few millimeters). The model was checked against a few spots around the planet. On average, the earthquakes deformed the crust by a hundredth of an inch every year (0.4 millimeters a year) — about the width of the lead in a mechanical pencil. [7 Craziest Ways Japan's Earthquake Affected Earth]
"It's quite amazing to us that we can see this and detect this," Tregoning said.[/QUOTE][QUOTE]Disturbing the reference frame will introduce errors into GPS measurements, Tregoning said. It could also throw off calculations of satellite orbits. "If the coordinates of the tracking stations are wrong, then the orbit isn't right either," he said.
"I think he's identified a good problem," said Don Argus, a principal research scientist at the Jet Propulsion Laboratory (JPL) in Pasadena, Calif., who was not involved in the study. Argus is part of a group that uses GPS to calculate satellite orbits and conduct research on the changing Earth.
"It's difficult to find a stable frame with these post-seismic transients," Argus said. "The earthquakes are making things a little hard for the people on our floor."[/QUOTE]