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- Seismic_hazard abstract "A seismic hazard is the probability that an earthquake will occur in a given geographic area, within a given window of time, and with ground motion intensity exceeding a given threshold. With a hazard thus estimated, risk can be assessed and included in such areas as building codes for standard buildings, designing larger buildings and infrastructure projects, land use planning and determining insurance rates. The seismic hazard studies also may generate two standard measures of anticipated ground motion, both confusingly abbreviated MCE; the simpler probabilistic Maximum Considered Earthquake (or Event ), used in standard building codes, and the more detailed and deterministic Maximum Credible Earthquake incorporated in the design of larger buildings and civil infrastructure like dams or bridges. It is important to clarify which MCE is being discussed.Calculations for determining seismic hazard were first formulated by C. Allin Cornell in 1968 and, depending on their level of importance and use, can be quite complex. The regional geology and seismology setting is first examined for sources and patterns of earthquake occurrence, both in depth and at the surface from seismometer records; secondly, the impacts from these sources are assessed relative to local geologic rock and soil types, slope angle and groundwater conditions. Zones of similar potential earthquake shaking are thus determined and drawn on maps. The well known San Andreas Fault is illustrated as a long narrow elliptical zone of greater potential motion, like many areas along continental margins associated with the Pacific ring of fire. Zones of higher seismicity in the continental interior may be the site for intraplate earthquakes) and tend to be drawn as broad areas, based on historic records, like the 1812 New Madrid earthquake, since specific causative faults are generally not identified as earthquake sources.Each zone is given properties associated with source potential: how many earthquakes per year, the maximum size of earthquakes (maximum magnitude), etc. Finally, the calculations require formulae that give the required hazard indicators for a given earthquake size and distance. For example, some districts prefer to use peak acceleration, others use peak velocity, and more sophisticated uses require response spectral ordinates.The computer program then integrates over all the zones and produces probability curves for the key ground motion parameter. The final result gives a 'chance' of exceeding a given value over a specified amount of time. Standard building codes for homeowners might be concerned with a 1 in 500 years chance, while nuclear plants look at the 10,000 year time frame. A longer-term seismic history can be obtained through paleoseismology. The results may be in the form of a ground response spectrum for use in seismic analysis.More elaborate variations on the theme also look at the soil conditions. Higher ground motions are likely to be experienced on a soft swamp compared to a hard rock site. The standard seismic hazard calculations become adjusted upwards when postulating characteristic earthquakes. Areas with high ground motion due to soil conditions are also often subject to soil failure due to liquefaction. Soil failure can also occur due to earthquake-induced landslides in steep terrain. Large area landsliding can also occur on rather gentle slopes as was seen in the Good Friday earthquake in Anchorage, Alaska, March 28, 1964.".
- Seismic_hazard thumbnail RogersCrkNorthHayward.gif?width=300.
- Seismic_hazard wikiPageExternalLink www.inrisk.ubc.ca.
- Seismic_hazard wikiPageExternalLink GSHAP.
- Seismic_hazard wikiPageID "230527".
- Seismic_hazard wikiPageLength "7702".
- Seismic_hazard wikiPageOutDegree "36".
- Seismic_hazard wikiPageRevisionID "678802521".
- Seismic_hazard wikiPageWikiLink 1811–12_New_Madrid_earthquakes.
- Seismic_hazard wikiPageWikiLink 1812_New_Madrid_earthquake.
- Seismic_hazard wikiPageWikiLink 1964_Alaska_earthquake.
- Seismic_hazard wikiPageWikiLink Anchorage,_Alaska.
- Seismic_hazard wikiPageWikiLink Building_code.
- Seismic_hazard wikiPageWikiLink C._Allin_Cornell.
- Seismic_hazard wikiPageWikiLink Category:Earthquake_and_seismic_risk_mitigation.
- Seismic_hazard wikiPageWikiLink Characteristic_earthquake.
- Seismic_hazard wikiPageWikiLink Determinism.
- Seismic_hazard wikiPageWikiLink Earthquake.
- Seismic_hazard wikiPageWikiLink Earthquake_engineering.
- Seismic_hazard wikiPageWikiLink Earthquake_prediction.
- Seismic_hazard wikiPageWikiLink Epicenter.
- Seismic_hazard wikiPageWikiLink Good_Friday_earthquake.
- Seismic_hazard wikiPageWikiLink Gravity.
- Seismic_hazard wikiPageWikiLink Hypocenter.
- Seismic_hazard wikiPageWikiLink Intraplate_earthquake.
- Seismic_hazard wikiPageWikiLink Land-use_planning.
- Seismic_hazard wikiPageWikiLink Land_use_planning.
- Seismic_hazard wikiPageWikiLink Landslide.
- Seismic_hazard wikiPageWikiLink Landslides.
- Seismic_hazard wikiPageWikiLink Maximum_magnitude.
- Seismic_hazard wikiPageWikiLink Metre_per_second_squared.
- Seismic_hazard wikiPageWikiLink Mitigation_of_seismic_motion.
- Seismic_hazard wikiPageWikiLink Neotectonics.
- Seismic_hazard wikiPageWikiLink Pacific_ring_of_fire.
- Seismic_hazard wikiPageWikiLink Paleoseismology.
- Seismic_hazard wikiPageWikiLink Peak_ground_acceleration.
- Seismic_hazard wikiPageWikiLink Probability.
- Seismic_hazard wikiPageWikiLink Response_spectrum.
- Seismic_hazard wikiPageWikiLink Ring_of_Fire.
- Seismic_hazard wikiPageWikiLink San_Andreas_Fault.
- Seismic_hazard wikiPageWikiLink Seismic_analysis.
- Seismic_hazard wikiPageWikiLink Seismic_performance.
- Seismic_hazard wikiPageWikiLink Seismic_risk.
- Seismic_hazard wikiPageWikiLink Seismometer.
- Seismic_hazard wikiPageWikiLink USGS.
- Seismic_hazard wikiPageWikiLink United_States_Geological_Survey.
- Seismic_hazard wikiPageWikiLink Vibration_control.
- Seismic_hazard wikiPageWikiLink File:2014_pga2pct50yrs_(vector).svg.
- Seismic_hazard wikiPageWikiLink File:RogersCrkNorthHayward.gif.
- Seismic_hazard wikiPageWikiLinkText "Seismic Hazard".
- Seismic_hazard wikiPageWikiLinkText "Seismic Hazards".
- Seismic_hazard wikiPageWikiLinkText "Seismic Zone III".
- Seismic_hazard wikiPageWikiLinkText "Seismic hazard".
- Seismic_hazard wikiPageWikiLinkText "Seismic_hazard#MCEs".
- Seismic_hazard wikiPageWikiLinkText "earthquake hazard".
- Seismic_hazard wikiPageWikiLinkText "earthquakes".
- Seismic_hazard wikiPageWikiLinkText "hazardous earthquakes".
- Seismic_hazard wikiPageWikiLinkText "hazards".
- Seismic_hazard wikiPageWikiLinkText "probabilistic seismic hazard analysis".
- Seismic_hazard wikiPageWikiLinkText "seismic hazard".
- Seismic_hazard wikiPageWikiLinkText "seismic intensity".
- Seismic_hazard wikiPageWikiLinkText "seismic-hazard".
- Seismic_hazard hasPhotoCollection Seismic_hazard.
- Seismic_hazard wikiPageUsesTemplate Template:Authority_control.
- Seismic_hazard wikiPageUsesTemplate Template:Geotechnical_engineering.
- Seismic_hazard wikiPageUsesTemplate Template:Reflist.
- Seismic_hazard subject Category:Earthquake_and_seismic_risk_mitigation.
- Seismic_hazard hypernym Probability.
- Seismic_hazard type Thing.
- Seismic_hazard comment "A seismic hazard is the probability that an earthquake will occur in a given geographic area, within a given window of time, and with ground motion intensity exceeding a given threshold. With a hazard thus estimated, risk can be assessed and included in such areas as building codes for standard buildings, designing larger buildings and infrastructure projects, land use planning and determining insurance rates.".
- Seismic_hazard label "Seismic hazard".
- Seismic_hazard sameAs Peligro_sísmico.
- Seismic_hazard sameAs Aléa_sismique.
- Seismic_hazard sameAs Pericolo_sismico.
- Seismic_hazard sameAs 震災.
- Seismic_hazard sameAs m.01hjtz.
- Seismic_hazard sameAs Q1632490.
- Seismic_hazard sameAs Q1632490.
- Seismic_hazard wasDerivedFrom Seismic_hazard?oldid=678802521.
- Seismic_hazard depiction RogersCrkNorthHayward.gif.
- Seismic_hazard isPrimaryTopicOf Seismic_hazard.