Glendale (PDF) - Hazard Mitigation Web Portal - State of California

Natural Hazards Mitigation PlanCity of Glendale, CaliforniaAppendix E – GlossaryAPPENDIX E:GLOSSARYAccelerationActive faultAftershocksAlluviumAssetAttenuationA zoneBase floodBase Flood Elevation(BFE)BedrockBlind thrust faultBuildingThe rate of change of velocity with respect to time. Acceleration dueto gravity at the earth's surface is 9.8 meters per second squared. Thatmeans that every second that something falls toward the surface ofearth its velocity increases by 9.8 meters per second.For implementation of Alquist-Priolo Earthquake Fault Zoning Act(APEFZA) requirements, an active fault is one that shows evidence of,or is suspected of having experienced surface displacement within thelast 11,000 years. APEFZA classification is designed for land usemanagement of surface rupture hazards. A more general definition(National Academy of Science, 1988), states "a fault that on the basisof historical, seismological, or geological evidence has the finiteprobability of producing an earthquake" (see potentially active fault).Minor earthquakes following a greater one and originating at or nearthe same place.Surficial sediments of poorly consolidated gravels, sand, silts, andclays deposited by flowing water.Any man-made or natural feature that has value, including, but notlimited to people, buildings, infrastructure like bridges, roads, andsewer and water systems; lifelines like electricity and communicationresources; or environmental, cultural, or recreational features likeparks, dunes, wetlands, or landmarks.The reduction in amplitude of a wave with time or distance traveled.Under the National Flood Insurance Program, area subject toinundation by the 100-year flood where wave action does not occur orwhere waves are less than 3 feet high, designated Zone A, AE, A1-A30, A0, AH, or AR on a Flood Insurance Rate Map (FIRM).Flood that has a 1 percent probability of being equaled or exceeded inany given year. Also known as the 100-year flood.Elevation of the base flood in relation to a specified datum, such as theNational Geodetic Vertical Datum of 1929. The Base Flood Elevationis used as the standard for the National Flood Insurance Program.The solid rock that underlies loose material, such as soil, sand, clay, orgravel.A thrust fault is a low-angle reverse fault (top block pushed overbottom block). A "blind" thrust fault refers to one that does not reachthe surface.A structure that is walled and roofed, principally above ground andpermanently affixed to a site. The term includes a manufactured homeon a permanent foundation on which the wheels and axles carry noweight.2006 PAGE E - 1