--- In californiadisasters@yahoogroups.com, Fred <djfred500@...> wrote:
>
> Does anybody have a date of when this is projected to start.
>
> Thanks
>
> -sent from phone
> On May 20, 2011 9:22 AM, "Vic Pollard" <sactovic@...> wrote:
> > Source here.
> >
> > Landslide danger in Bay Area high, new map reveals
> > Peter Fimrite, Chronicle Staff Writer
> > Friday, May 20, 2011
> >
> >
> >
> > Communities in the mountainous areas of the Bay Area, including much of
> Marin County, are in more danger than other places in the state of being
> leveled by a catastrophic landslide, the California Geological Survey
> revealed Thursday.
> > The map of California's most landslide-prone areas is an attempt by the
> Geological Survey to determine the most vulnerable spots in the event of an
> epic superstorm, known as an ARk storm, which scientists warned about
> earlier this year.
> > "The goal in this was to develop a scenario for a major storm," said Chris
> Wills, the Geological Survey's supervising geologist. "We felt it was
> important to get this basic information out so people can look at what are
> the most susceptible areas."
> > The map is the most detailed analysis of landslides that has ever been
> compiled in California. It shows that the North Coast between Sonoma County
> and Oregon and the Coast Range between San Francisco and Los Angeles are the
> most susceptible areas in the state. About two-thirds of Marin and Sonoma
> counties are categorized as high-hazard areas. The Santa Cruz Mountains and
> the East Bay hills are also highly susceptible to landslides, according to
> the map.
> > Mendocino, Humboldt, Santa Barbara and Ventura counties also have large
> swaths of land that could be termed high-hazard zones.
> > The map analyzed the rock, soil and steepness of the terrain in the
> locations of 57,000 historic landslides that had been compiled in a
> database. The steepest areas with the most crumbly rock and loosest soil got
> the worst ratings, Wills said.
> > "The hills all the way around the bay have significant landslide
> potential," Wills said. "There are a number of areas in the East Bay and
> Marin County and down on the Peninsula where there are communities dating
> back to the 1920s. These are fairly high-population areas with older homes
> built at a time when landslides weren't recognized and considered in
> development."
> > Landslides kill from 25 to 50 people and cause more than $2 billion in
> damage in the United States every year. More than 100 Californians have been
> killed by debris flows during the past 25 years.
> > The last fatal landslide in California occurred in Mill Valley in 2006
> when a fast-moving wall of mud buried a 76-year-old landscape architect
> behind his home. Ten people were killed, 14 were injured and 31 homes were
> destroyed by a 30-foot wall of mud in Ventura County in 2005.
> > "We've seen the kind of tragedy that landslides can produce not just in
> Marin but throughout the state," said Assemblyman Jared Huffman, D-San
> Rafael. "We know that we are going to have a lot more weird weather in the
> years ahead, so the more information we have the better we will be in
> putting together emergency response plans and keeping people out of harm's
> way."
> > The idea of the map is to help prepare for the kind of catastrophic storm
> that last hit California 150 years ago, flooding the Central Valley. A
> scientific model released earlier this year estimated that such a storm now
> would cause $300 billion in property damage.
> > Geologists have dubbed these events ARk, or Atmospheric River storms, but
> to most people the name refers to the kind of gully washer that prompted
> Noah to build his ark. Property damage and death from landslides generally
> go way up in years when the state's rainfall totals are abnormally high.
> > "Recent events in Japan have made the public exceptionally aware of
> earthquakes and tsunamis, but landslides are a more common hazard in
> California," said Derek Chernow, acting director of the California
> Department of Conservation. "People associate landslides with rain - indeed,
> this map was created for a storm scenario - but they can happen anytime.
> Fortunately, they often give some warning to those who familiarize
> themselves with the signs."
> > Wills said future studies will analyze events that trigger landslides and
> how often they occur.
> > "Landslides are just a natural part of the landscape, but they get to be a
> problem when people build around them," Wills said. "Now that we have the
> susceptibility map, we can take any storm or any storm season and see what
> the likelihood of a major landslide is."
>
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