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Following increased volcanic activity, earthquake activity will increase in California as well as the area between the south of Nevada and Salt Lake.
Originally posted by westcoast
reply to post by Disconnected Sociopath
Thank you for the map. This may seem odd, but I have never really looked at or studied his work. I have seen this before (and may have even used it or one similar to it) on the arkansas thread, when talking about the new madrid but I didn't pay attention to the west coast, as I was focused on Arkansas. (ironic, eh?)
I have to say, it is a bit eerie. The new coast line pretty much follows the accepted location of the Cascadian subduction zone AND where I (and obviously others) think it continues on. Now, also taking into consideration the very important underground aquifer locations (kro23 suggested?) and it makes this map even more plausible. If there were to be a major rupture (like on what happened on the seafloor of Japan, only bigger) the saturation of the land would come into play BIG time. Also, if there ARE a network of plumes these would obviously be impacted and perhaps set off a chainreaction, further leading to the end result as shown in the map.
I just got an email from an ATS member providing a link to a heat flow map. (many thanks!) Here is the link to the map of North America:
heat flow map
It comes from the: Global Heat Flow Database of The International Heat Flow Commission
So I think it is reliable.
Compare the red for the states in my hot springs map. As I said before and will say again, I only mapped out the hottest ones...there are many, many more. Interesting.
I have to say too that I am really enjoying some of the other discussions about topics I have never heard of. Do they tie in? Who knows. We WON'T know however if we never consider it!
The most intense of these swarms began in May 1980 and included four strong magnitude 6 shocks, three of which struck on the same day. Immediately following these shocks, scientists from the U.S. Geological Survey (USGS) began a reexamination of the Long Valley area and detected other evidence of unrest—a dome-like uplift in the caldera. Their measurements showed that the center of the caldera had risen almost a foot since the summer of 1979, after decades of stability. This continuing swelling, which by early 2000 totaled nearly 2.5 feet and affects more than 100 square miles, is caused by new magma rising beneath the caldera.
In May 1980, a strong earthquake swarm that included four Richter magnitude 6 earthquakes struck the southern margin of Long Valley Caldera associated with a 10 inch (25-cm), dome-shaped uplift of the caldera floor. These events marked the onset of the latest period of caldera unrest that continues to this day. This ongoing unrest includes recurring earthquake swarms and continued dome-shaped uplift of the central section of the caldera (the resurgent dome) accompanied by changes in thermal springs and gas emissions. After the quake another road was created as an escape route. Its name at first was proposed as the "Mammoth Escape Route" but was changed to the Mammoth Scenic Loop after Mammoth area businesses and land owners complained.
Originally posted by Bishop2199
Now that we are seeing swarming activity in the LV caldera and suspect activity in the Pacific Northwest, could this be an indicator of something to come soon?
I suppose if we could reference historical correlations between the two locations at the previous eruptions of Mt. St. Helens, we would have more basis for drawing conclusions. Anyone up to the challenge? Is the seismic data even available?
Be Well.edit on 18-4-2011 by Bishop2199 because: (no reason given)
Originally posted by PuterMan
reply to post by Bishop2199
It is a great idea and well spotted. Unfortunately I doubt that any significant earthquake records exist for 1857, 1800, 1720 or earlier. I will take a look and see if I can find anything but somehow I doubt anything will be available for Long Valley for those years.
The Fort Tejon earthquake of 1857 was one of the greatest earthquakes ever recorded in the U.S., and left an amazing surface rupture scar over 350 kilometers in length along the San Andreas fault.
I have to inform your Excellency that the Mission of San Juan Bautista, since the 11th inst., has been visited by severe earthquakes; that Pedro Andriano Martinez, one of the Fathers of said Mission, has informed me that, during one day, there were six severe shocks; that there is not a single habitation, although built with double walls, that has not been injured from roof to foundation, and that all are threatened with ruin; and that the Fathers are compelled to sleep in wagons to avoid danger, since the houses are not habitable.