Characteristic Analysis of Anomalies of Strong Earthquakes along the Tancheng-Lujiang Fault Zone and Both Its Sides-中国Betway体育网页登陆

摘要 Thisarticlemadeasystematicstatisticalanalysisontheduration,spatialdistribution,form,range,typeandreliabilityofprecursoryanomaliesbasedontheobservationsofprecursorsof24moderate-strongearthquakesoccurringalongtheTancheng-LujiangfaultzoneanditsbilateralareasinShandong,Liaoning,Hebei,JiangsuandJiangxiProvincesintheperiodfrom1966to2005.Resultsshowthat:(1)ForM7.0andM6.0earthquakes,med-termabnormitiesarethegreatestinnumber,short-termabnormitiescomesecond,andimminentanomaliesaretheleast.ForM5.0earthquakes,short-termabnormitiesareoftenthemostinnumber,imminentanomaliescomesecond,andthemed-termonesaretheleast.(2)Precursoryanomaliesareperiodical,partofthemedandshort-termanomaliesareshownasshort-termandimminentanomaliesduringtheirdevelopment.(3)Thedevelopmentofprecursorshowsquasi-synchronism;theclosertoearthquakeoccurrencetime,themoreturningchangesofanomalieswillappear.(4)Anomaliesmainlyoccurwithinanepicenterdistanceof100km,showingarelativeconcentrateddistributioninspace,andtheshorterthedistancetoepicenter,thehighertheanomalystation/itemrate.(5)Thespatialdistributionofanomaliesisrelativelycorrelatedtothestrikeofstructures,havingagoodconsistencywiththestructure.(6)Thereisnosignificantcorrelationbetweendurationofabnormitiesandtheepicenterdistance.(7)Thehigherthemagnitudeoftheearthquake,thegreatertheamplitudeoftheabnormitiesmeasuredwiththesameobservationapproach.(8)Intermsoftheitemsoftheobservations,fluidabnormitiesarethegreatestinnumber,followedbydeformationandelectromagnetismobservations.(9)Forallobservationitems,medandshort-termabnormitiesmakeupthemajorityandshort-termandimminentanomaliestheminority.(10)Influid,deformationandelectromagnetismobservations,fairlyreliableanomaliesareaboutdoublethenumberofreliableanomalies.

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Characteristic Analysis of Anomalies of Strong Earthquakes along the Tancheng-Lujiang Fault Zone and Both Its Sides

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