calif experiencing a greater amount of quakes

Tundra Gypsy

Tundra Gypsy

Veteran Member
The activity had been in the high 400s to 500s for some time. Now it has taken a big jump and when I looked this evening, is was at 708! One thing that I have noticed of late is the increased activity in Nevada. I thought California had all the major fault lines; what gives with Nevada? Strange to me...
 
C

CAgdma

Inactive
RE: the map shows more quakes than usual.

Are we taking into consideration that this map of 2/11 includes all the quakes in the past week?

And, are we considering that the vast majority of those quakes are twos, with some ones, which we do not feel, and then some threes, which we also don't feel unless we are quite near the epicenter and sitting very, very still.

The faults creep everyday. We just don't notice it until they get larger.

I feel that I can speak with some authority, as I was 10 miles from the epicenter in 1989 (the big quake: Loma Prieta). That was a big ride!

What the news probably does not say, very often, is the huge number of after shocks that an area gets after a quake like the 7.0 Loma Prieta. (Was it downgraded to a 6.9 or upgraded to a 7.1? I cannot remember) The aftershocks went on for months!

The map looks pretty normal to me.

But we are due for movement on the Hayward Fault, which historically follows the San Andreas.
 
J

JUDGECAL

Deceased
these are all the earthquakes since saturday, four of which were 5.0+ and the majority of the rest are in the high 2's up to the high 4's
 
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J

JUDGECAL

Deceased
the epicenter is directly under The Cerro Prieto geothermal field, which is a small volcano in Baja. the big pool in the image is a geo-thermal electricity plant for Mexico.


here's a google earth link to the location of the swarm:
http://maps.google.com/maps?q=32.45...07,-115.292931&spn=0.11651,0.115871&z=13&om=0

here is a cool link to a near-realtime java seismograph in berkeley. it's registering jolts every few mins:
http://memento.ieor.berkeley.edu/seismo.html?



The Cerro Prieto geothermal field is located at the head of the Gulf of California, 35 km south of the city of Mexicali. Cerro Prieto lies in an active continental rift that is transitional between the transform San Andreas fault system to the north and a spreading ridge of the East Pacific Rise in the Gulf of California to the south. The only surficial volcanic feature at Cerro Prieto, which is located near sea level on the Colorado River delta, is a small, 223-m-high compound dacitic lava dome. A 200-m-wide crater is located at the summit of the NE-most dome. The Cerro Prieto dome was roughly estimated from paleomagnetic evidence to have formed during a series of events between 100,000 and 10,000 years ago. Cucupas Indian legends described a monster that covered the land with hot rocks, which grew through the soil and emitted fire tongues, a possible reference to the growth of the volcano.
 
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