Lake Tahoe region overdue for 7.0 magnitude earthquake and mega-tsunami

December 7, 2012NEVADA A tsunami-producing fault in Lake Tahoe is overdue for another earthquake, scientists said here Tuesday at the annual meeting of the American Geophysical Union. The West Tahoe Fault is capable of producing a magnitude-7.3 earthquake and tsunamis up to 30 feet (10 meters) high in the clear blue lake, where million-dollar homes line the shore, researchers said. Earthquakes strike every 3,000 to 4,000 years on the fault, and the most recent shaker was 4,500 years ago, indicating the fault is overdue for another earthquake, said Jillian Maloney, a graduate student at the Scripps Institution of Oceanography in San Diego. The West Tahoe fault defines the west shore of the lake, coming on shore at Baldwin Beach, passing through the southern third of Fallen Leaf Lake, and then descending into Christmas Valley near Echo Summit. To trace the fault’s history, Maloney and her colleagues examined data from a CHIRP seismic imaging system, which details underwater sediment layers at very high resolution. (CHIRP stands for compressed high intensity radar pulse.) The researchers correlated landslide deposits, which could be related to past earthquakes, throughout western Lake Tahoe and in small lakes immediately to the south with radiocarbon dates from the sediments. The West Tahoe Fault has a complicated history, the analysis reveals. The fault appears to alternate between breaking all at once, in a 31-mile long (50 kilometer) fracture, and in smaller, shorter segments. The discovery has implications for the Tahoe’s seismic hazard, because the size of an earthquake relates to the length of a fault rupture, Maloney said. The biggest earthquakes come from the longest fault fractures. The correlations, while still at an early stage, indicate the last time the fault’s entire length ruptured was 7,800 years ago, Maloney told OurAmazingPlanet. More recent quakes occurred on individual segments, she said. Because the fault crosses the lake, scientists worry a future earthquake will cause a tsunami in Lake Tahoe. The monster waves could form in two ways: by the fault displacing ground under the lake, similar to Japan’s Tohoku tsunami, or by causing landslides that displace the water. A combination of both could also create an even bigger wave. Layers of sediment preserved in and around Lake Tahoe record evidence of past tsunamis, said Graham Kent, director of the Nevada Seismological Laboratory in Reno. However, having smaller earthquakes on the West Tahoe Fault would be better for the ski town. “If it breaks up into multiple segments, it might not be as great a tsunami risk,” Kent told OurAmazingPlanet. The most recent earthquake in the Tahoe region was about 575 years ago, on the Incline Fault, which becomes active about every 10,000 to 15,000 years. Scientists estimate its earthquake size potential at magnitude 7. –MSNBC
This entry was posted in Civilizations unraveling, Earth Changes, Earth Watch, Earthquake Omens?, High-risk potential hazard zone, Infrastructure collapse, Landslide & geological deformation, Potential Earthchange hotspot, Seismic tremors, Signs of Magnetic Field weakening, Strange high tides & freak waves, Time - Event Acceleration. Bookmark the permalink.

7 Responses to Lake Tahoe region overdue for 7.0 magnitude earthquake and mega-tsunami

  1. Bert Fannin says:

    This is a little more alarming then the Japan reportage. It does not happen that often in Lake Tahoe.


  2. prayntongues says:

    This is the 4th report in about a month regarding tsunamis threats and hazards. Why all of a sudden are these reports being released? It is as though they are warning that the tectonic plates are going to suddenly unleash. Several great EQs are due to happen in the near future, marking certain events, as it is written in Rev 6:12-17; 8:5; 11:13 & 19; 16:17-21.


  3. Angelsong says:

    Thank you Alvin for your always timely responses…I hope that people can see that we are living in unprecedented times!

    God bless you and yours as always 🙂


  4. Kwazai says:

    The history channel had an interesting documentary on Mt. St. Helen’s where a series of small multi-shock tremors signaled major moves in the area before and after the eruption. The sinkhole in Alaska may be preceded by similar ‘tremors’ before moving.
    Most of the alarmist stuff is people who don’t realize the time frame involved. More than enough warning.
    The alaska sinkhole said it was probably a ‘shale oil’ fire that lightning set off in the first place. The rest being the apogee perigee min max of the earths orbit around the sun. Gravity affecting flare activity (catch 22- ‘ the more I drink, the more I drink, the more I drink” as the country song goes-so to speak) and the solar collector-earth- gets more btu/hr. I’d wonder if the PV cell irradiance(sp?) has gone up. I’m not sure when it will be the closest this 4 year mark. from the look of it though toutatis (not as close as 2004?) is gonna be pretty far away. I’d thought it’d break in two on the back side of the sun, but its still in one piece (I think.??).
    the paranoid and the megalomaniacs in a ‘crisis’is probably a bigger concern (and looters..).
    Hopi Indian lore says when it occurs keep moving to survive- so sooner or later it would be everywhere??
    I think one of Nostradamus predictions says souls will be loosed from hell- but I believe that occurred with Jesus Resurrection.
    I always thought the final Revelations events was half a ‘time’ cut short rather than a ‘week’ of years as Daniels prophecies are assumed to predict.


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