On Sat Aug 27th, 2011 8:54 AM PDT Lin Kerns wrote:
>Earthquake Swarm near Pinnacles National Monument in California
> <https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX9En8P954IIHp2jFlvSk9HJ99NaYYjKKQ8X2-tHfQ8Xylqc8r842TCfbb9dHp_k2JoWKmz-t4Kmmiiz6icM_kJ0RiyeLQgOYr05_3RtCJOFNFTz44zAj82LTLny1lsD1dW5KUwQob4Xc/s1600/121-37.gif>
>Source:
>U.S. Geological Survey (
>http://earthquake.usgs.gov/earthquakes/recenteqscanv/FaultMaps/121-37.html) An
>earthquake swarm is affecting the San Andreas fault system in the Pinnacles
>National Monument region of the Central California Coast Ranges. The biggest
>event thus far<http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nc71627835.html>is
>a magnitude 4.6 at a depth of 7.6 km, with
>other significant
>quakes<http://earthquake.usgs.gov/earthquakes/recenteqscanv/FaultMaps/121-37_eqs.html>measuring
>3.2, 3.2, 3.3, 3.6, and 3.3. There have been nearly 100
>instrumentally recorded quakes between magnitude 1 and 3. The quakes are
>taking place in a complex region of the fault system where the Calaveras,
>Hayward and San Andreas faults merge into a single fault. This area is
>notable because the San Andreas fault is creeping, rather than sticking,
>meaning that the fault moves constantly (a few millimeters a year) instead
>of storing up stress and producing monster quakes like it does both to the
>north and to the south.
>
><https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9NZfHnISL_4UzAGgJevZz9Mt_okhLgPzGFPPK2eR5mWboG8V7H2LDLBOFj_C6cM94O_S02zlmS8UswpDdcFaE9BM89w2lIMNTXR435XcBSIOEojY2lggZZ4QT4wadyZBuwtwJvHRguwk/s1600/DSC00024+Road+damage.jpg>
>Road
>damage from fault creep on the San Andreas fault near the earthquake
>epicenter. This is a 2010 picture; the damage was NOT caused by the
>earthquakes today This is not an unusual pattern; flurries of similar
>earthquakes<http://articles.sfgate.com/2004-11-25/bay-area/17452713_1_san-andreas-fault-hayward-fault-magnitude>have
>occurred in the Pinnacles area in 1951, 1972, 1982, 1995, and 2004. If
>the pattern holds true, the quakes will decline in number and size over the
>next few days. There is always a small chance that the activity (including
>the 3.9 quake in San Leandro earlier this week) is a precursor to a much
>larger earthquake, such as the magnitude 7 event that took place on the
>Hayward fault in 1868, which killed two dozen people. A recurrence of the
>1868 earthquake would cause serious damage and destruction in the East Bay
>region.
>
>Events like these are reminders that we Californians are living in
>earthquake country, and that we need to be prepared for larger catastrophic
>seismic events. It is a virtual certaintly that the state will be rocked by
>magnitude 7+ events in the next few decades, and some of these earthquakes
>will affect urban regions. One should always have emergency supplies
>available, and a plan for what to do in the event of a major earthquake.
><https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3rpkJGZtJ905GRCVDSp-bO3PwIiFAxo4N5QXCltBThzyb3Nw0QFwgIbUIZtqOFE4O3nMPjhe00gluRvXktoA0YV1A5LseI-krSh6jBbEuunVcvu1T2B_wcDkgigfZ9Vpv96qtUlOMcAE/s1600/DSC04038+Small+shutter+ridge.jpg>
>Shutter
>ridge on the San Andreas fault near the earthquake swarm epicenter. The
>fault follows the fence line
>
>
>source<http://geotripper.blogspot.com/2011/08/earthquake-swarm-near-pinnacles.html>
>
>--
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