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- HUNTSVILLE, Ala., April 20,1992 -- Block-by-block, house-by-house,
- earthquake and landslide hazards across California will be charted by
- computer-generated maps being developed under a four-year, $2.35 million
- contract announced today.
-
- The maps will assemble a three-dimensional picture of California that state
- and local officials will use to warn residents and developers if their
- homes or building sites are in dangerous earthquake or landslide zone.
-
- Intergraph Corporation (Huntsville, Ala.) won the contract, which was
- awarded by the California Department of Conservation's Division of Mines
- and Geology.
-
- Intergraph is the world's largest developer and supplier or geographic
- information systems--computers systems that collect and analyze data on
- the relationships of geographic objects to determine their effects on each
- other.
-
- The map-making project is described as "the first of its kind in the world"
- by Charles R. Real, senior seismologist and manager of the division's new
- Seismic Hazards Evaluation and Zonation Project (SHEZP).
-
- "Maps will be produced in color to an accuracy of three meters (a little
- over three yards)," Real says.
-
- Project Established in July
-
- SHEZP was established last July following enactment of the 1990 Seismic
- Hazards Mapping Act requiring identification of earthquake hazard zones by
- the California Division of Mines and Geology.
-
- Intergraph will provide a computer system for geographic and geological
- analysis, remote sensing, photogrammetry, image processing and terrain
- modeling, plus maintenance and training of division staff.
-
- "The computer system blends geography and geology to collect land features
- from aerial photographs and satellite images of the Earth's surface, along
- with well logs and core samples from bore holes of the subsurface," says
- Anthony J. Palicki, Intergraph's senior manager of Natural Resources
- Information Systems.
-
- "The data won't predict when or where an earthquake will happen," he
- continues. "What it will do is tell us which areas are most susceptible to
- earthquake hazards and where the greatest damage is likely to occur."
-
- The digital maps will be derived from surface and subsurface
- characteristics of known landslide sections of the San Francisco Bay
- area--land elevation and slope, vegetation, type of soil, rock formations,
- sand porosity underground and level and flow of the water table.
-
- Temporal data, such as the time of year, accumulated rainfall and changes
- in vegetation growth, also will be part of the geographic data base.
-
- "What we're doing, in effect, is telling the computer, 'O.K., here's what
- causes an earthquake-induced landslide', Palicki explains, 'and here are
- surface and subsurface pictures of the whole state. Now, you match them up
- and show us where the hazards are."'
-
- Palicki says the California project has already drawn interest in
- Intergraph from Japan, New Zealand and other Asia-Pacific countries along
- the earthquake-prone "Ring of Fire."
-
- "The technology of geographic information systems has advanced so ear," he
- says, "no area of the world with serious earthquake and landslide hazards
- can ignore it."
-
- East Bay Data
-
- "Intergraph proved SHEZP can do the computer-comparison in a benchmark test
- using a partial database from the East Bay of San Francisco," says SHEZP's
- Real.
-
- "We queried the computer, and highlighted areas started filling the
- screen--red for high risk, yellow for medium risk, green for low risk.
-
- "Risks will vary," Real explains, "because earthquake waves make lopsided
- patterns, sending more energy in some directions than in others. Two sites
- equally distant from an epicenter will likely experience different levels
- of damage, depending on the type of soil and topography," he says.
-
- "The goal of the project," Real continues, "is for new residential and
- commercial development to be built away from seismic hazards, instead of
- right on top of them; and at a minimum, to reduce the danger by
- stabilizing hazardous soils and improving building design."
-
- "Beyond that," Real says, "California residents will be able to get copies
- of SHEZP maps of their area to find out if their homes are at a greater
- than average risk--and to do something about it before the next quake
- hits."
-
- Act Requires Earthquake Plan
-
- California's Seismic Hazards Mapping Act requires developers to come up
- with a plan to deal with earthquake hazards before local governments
- approve construction. The act also requires disclosure by sellers to
- buyers of property in a hazardous seismic zone.
-
- "We're going to map every inch of urban California," says Real, adding,
- "When SHEZP's computer database and digital maps are available, they can
- be loaded into a city or county's own computers to help local governments
- apply safer building standards where earthquake hazards exist."
-
- Real says the digital maps will concentrate on ground-shaking hazards,
- which account for nearly all earthquake losses. The maps will also
- identify areas susceptible to landslides and liquefaction, the tendency of
- very wet ground to turn mushy when it's shaken by a quake.
-
- The first system will be installed this summer in the Division of Mines and
- Geology's development and coordination office in Sacramento, followed by
- field office installations in San Francisco in 1992 and Los Angeles in
- 1993.
-
- "The San Francisco, Los Angeles and San Diego metropolitan areas of the
- state account for 70 percent of the population, and they will be charted
- first--by the year 2012," Real says.
-
- "The remainder of the state's urban centers will be charted by 2020--and
- none too soon," Real warns. "Geological odds makers say there's a 2-to-1
- chance that a catastrophic earthquake will happen in California by then."
-
- Intergraph Background Information
-
- Intergraph Corporation's products include a broad range of complementary
- workstations and network serves, as well as complete application-specific
- systems for computer-aided engineering, design, manufacturing and
- publishing, plus numerous earth science applications. A Fortune 500
- company, Intergraph is the world's largest company dedicated to developing
- and manufacturing interactive computer graphics systems.
-
- Intergraph Corp, Huntsville, AL 35894-0014
- 205-730-8302
-
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