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Here is a question for the California peeps and others with an answer,
Earthquakes are caused by tectonic plate movement,. They relieve stress that has built up over time.
Now, if stress is relieved in one spot by earth/plate movement, will that in fact place an increased amount of stress on other areas with fault lines ?. And, will that increased stress increase the chances of an earthquake in those other fault areas ?.
not necessarily. Big Quakes happen on segments of the fault that have become locked together. Many areas are not locked up and creep by each other all the time with micro quakes so a big quake adjacent to those areas is not going to trigger a big quake nearby. Conversely a big quake in proximity to another locked segment can trigger another big quake on the adjacent locked area (doesn't have to be on the same fault). If you look at a California fault map you will see bends on the faults. those areas are prone to locking. on the San Andreas: San Fernando , Riverside, San Francisco Bay Area (San Andreas and Hayward Faults ( My Area)) Gorda Subduction zone off Eureka (Billy Right Wings area) regions are prone to bigger quakes.Quote:
Originally Posted by Independent Voter
quake map http://scedc.caltech.edu/recent/
But in this case the 6.4 was a foreshock. Just got hit by a 7.1 . I have been in 2, 7.1 quakes they are quite violent
Southern California was jolted by a magnitude 7.1 earthquake at 8:19 p.m. on Friday one day after the region was hit by a 6.4 quake, the USGS reports.
The epicenter was 10.5 miles away from Ridgecrest, Calif., and there were no immediate reports of damage or injuries. According to the USGS, the quake was felt as far north as San Jose and as far south as parts of Mexico.
After Friday night's quake, the USGS said Thursday's 6.4 quake was a "foreshock" for the earthquake Friday night, and Southern California residents should expect aftershocks.
The USGS also did not rule out the possibility that Friday night's 7.1 quake could be a foreshock to something even bigger. After Thursday's quake, USGS officials said there was a 5 percent chance a bigger quake could strike the same region.
"With any earthquake, there is a 5 percent chance something even bigger will happen within the next three days," USGS seismologist Susan Hough told SFGATE on Thursday. "If it did, it would be in the same remote area." A 5.4 quake early Friday morning was the largest aftershock of the Fourth of July quake.
The quake was felt in both Los Angeles and Las Vegas. An NBA Summer League game between the New York Knicks and New Orleans Pelicans in Las Vegas was postponed indefinitely.
Thursday's quake struck at 10:33 a.m., and was the largest temblor to strike the region in 20 years, until Friday night. According to the USGS, the 7.1-magnitude earthquake was 11 times stronger than the 6.4 earthquake.
Did not feel it here but we were floating in the pool last night when the water started sloshing over the coping..... weird event for us.
Conversation after experiencing one in Ontario CA. included the "locals" telling the easterner past earthquake stories. All seemed to have swimming pool stories, with various amounts of water being tossed out, but the winner was the guy who told about him and his wife being tossed out of their water bed by a mini tsunami. :uhuh:
Aerial view of faulted road on the China Lake NAWS base. Total measured right-lateral offset of about 6.5 feet and approx 3 feet vertical. Large offset at bottom of pic is ~5 feet. SO COOL!! #Ridgecrest#earthquake#RidgecrestEarthquake
From (mrbrianolson) https://t.co/qMMJZNgcq5
https://scontent-ort2-2.xx.fbcdn.net...bd&oe=5DC5E6CB
I’ve heard that the up & down tremors are the most destructive ones. In this case the first major one was primarily horizontal, while the second one was vertical. Very fortunately, the activity was in the middle of the Mojave Desert.
Quote:
Originally Posted by wacojoe
yeah right where we have some very highly classified DOD facillities...small places like the Lockheed skunk works, naval air weapons station China lake, Edwards air force base just to name a few