【当人们遇到紧急情况时该怎么做?比方地震,火灾.最好是英文】
当人们遇到紧急情况时该怎么做?比方地震,火灾.最好是英文
【当人们遇到紧急情况时该怎么做?比方地震,火灾.最好是英文】
当人们遇到紧急情况时该怎么做?比方地震,火灾.最好是英文
Anearthquakeisaphenomenonthatresultsfromandispoweredbythesuddenreleaseofstoredenergythatradiatesseismicwaves.AttheEarth'ssurface,earthquakesmaymanifestthemselvesbyashakingordisplacementofthegroundandsometimestsunamis,whichmayleadtolossoflifeanddestructionofproperty.
Earthquakesmayoccurnaturallyorasaresultofhumanactivities.Initsmostgenericsense,thewordearthquakeisusedtodescribeanyseismicevent—whetheranaturalphenomenonoraneventcausedbyhumans—thatgeneratesseismicwaves.
Measuringearthquakes
Mainarticle:Seismicscale
SinceseismologistscannotdirectlyobserveruptureintheEarth'sinterior,theyrelyongeodeticmeasurementsandnumericalexperimentstoanalyzeseismicwavesandaccuratelyassessseverityofearthquakes.Theseverityofanearthquakecanbemeasuredintermsofmagnitudeandintensity.Forthatseismologistsusetwofundamentallydifferentbutequallyimportanttypesofscales.Theoriginalforceorenergyofanearthquakeismeasuredonamagnitudescale,whiletheintensityofshakingoccurringatanygivenpointontheEarth'ssurfaceismeasuredonanintensityscale.
Whilethenon-specializedmediawilloftenrefertothemagnitudesofearthquakesasbeingreportedontheRichterscale,themagnitudesreportednowadaysareactuallyonthemomentmagnitudescale.TheolderRichterscaleisnotadaptedforlargerearthquakes.
Theanalysesofearthquakeseverityallowscientiststoestimatethelocationsandlikelihoodsoffutureearthquakes,helpingidentifyareasofgreatesthazardandensuresafetyofpeopleandinfrastructurelocatedinsuchareas.
Anearthquakeisaphenomenonthatresultsfromandispoweredbythesuddenreleaseofstoredenergyinthecrustthatpropagatesseismicwaves.AttheEarth'ssurface,earthquakesmaymanifestthemselvesbyashakingordisplacementofthegroundandsometimestsunamis,whichmayleadtolossoflifeanddestructionofproperty.
Earthquakesmayoccurnaturallyorasaresultofhumanactivities.Initsmostgenericsense,thewordearthquakeisusedtodescribeanyseismicevent—whetheranaturalphenomenonoraneventcausedbyhumans—thatgeneratesseismicwaves.