QUAKE FEARS FOR SOUTH CALIFORNIA

  • 2toner1-2
  • mse-big-banner-new-03-17-2016-416716a-tonernews-web-banner-mse-212
  • 05 02 2016 429716a-cig-clearchoice-banner-902x177
  • 4toner4
  • cartridgewebsite-com-big-banner-02-09-07-2016
  • clover-depot-intl-us-ca-email-signature-05-10-2017-902x1772
  • ces_web_banner_toner_news_902x1776
  • banner-01-26-17b
  • Print
Share

QUAKE FEARS FOR SOUTH CALIFORNIA

 user 2006-06-22 at 12:15:00 pm Views: 57
  • #15843

    Quake fears for south California
    The
    southern part of the San Andreas fault is overdue for a large
    earthquake, according to a study in the journal Nature.This end of the
    fault has not experienced a major rupture for at least 250 years and is
    now primed for a release of the built-up tension.The study by
    geophysicist Yuri Fialko provides the most precise measurements yet of
    this accumulated stress.But scientists cannot predict when another
    quake is likely to strike.
    The San Andreas fault runs for roughly
    1287km (800 miles) through western and southern California in the US.
    It marks the meeting point of the Pacific and North American tectonic
    plates.The southern segment begins near the Salton Sea and runs
    northward before bending to the west where it meets the San Bernardino
    Mountains. Los Angeles is the biggest city located near this part of
    the fault.Professor Fialko looked at eight years of radar data from
    European Space Agency satellites that measure in detail how the ground
    moves and 20 years of global-positioning system (GPS) data.His analysis
    suggests the two plates either side of the San Andreas fault are moving
    past each other at a rate of about 25mm each year – the fault’s “slip
    rate”.The bigger the average slip rate along a fault line, the more
    stress might be expected to accumulate on parts of the fault that
    remain locked together. In the absence of a sudden rupture to ease the
    strain, the fault has built up 5.5-7m of “slip deficit”.
    Taking the strainIf
    all the strain was released at once, it would have enough energy to
    unleash a magnitude-8 earthquake – roughly the size of the devastating
    1906 quake in San Francisco.”The southern section of the fault is fully
    loaded for the next big event,” Professor Fialko, of the Scripps
    Institution of Oceanography in La Jolla, explained.Quakes are predicted
    to occur on the southern part of the fault every 200-300 years. And
    according to Professor Fialko, the observed movement on the fault is on
    a par with the maximum amount of shift the fault has ever experienced
    between quakes.Scott Brandenberg, a professor at the University of
    California, commented: “This is new evidence that tells us the same
    story that we have known for a while.”It’s a reminder that we need to
    be ready for it when it happens.”The most recent major earthquakes in
    the northern and central zones of the San Andreas fault were in 1857
    and 1906 respectively.