简介：WeusedearthquakecatalogsrecordedbyGuangdongSeismologicalNetworkfrom2008to2014toresolvethespatialvariationsofb-valuesinthecoastalareaofGuangdong,particularlyinthreekeyresearchareas(Yangjiang,Heyuan,andoffshoreNanaoIsland)withstrongseismicity.Ourresultsrevealedthatb-valuesexhibitedsignificantspatialvariations,andzoneswithlowb-valuescouldindicatethemostlikelyseismogenicareaoflargeearthquakes.Weobservedthreeclearlowb-valuepatchesintheoffshoreNanaoIsland.Wefoundadistincthighb-valuepeakatthedepthof11kmandtwominimumpeaksatabout14and7–8kmintheYangjiangarea.Theoverallb-valuesgenerallydecreasewithdepthintheHeyuanarea.Thespatialvariationsofb-valuesreflecttectonicanomalies;thatis,the‘low-high-low’distributionofb-valuesintheoffshoreNanaoIslandandtheYangjiangareamayindicatetheanomalyofthecrustalstructurewithaweaklayer.Theb-valuesofreservoir-inducedseismicityareobviouslylowerthanthatinducedbytectonism.Thisfindingindicatesthatthereservoirareaisgenerallyathighstressstateundertheconditionofhighporepressure.Weinferredthatlargeearthquakesmightbepronetooccurat10–12kmdepthintheoffshoreNanaoIsland,at12–15kmdepthintheYangjiangarea,andatthelowerpartoftheseismicactivityzoneintheHeyuanarea.Moreover,theupstreamareaoftheXinfengjiangreservoiristhemostlikelyareaoffuturelargeearthquakesintheHeyuanarea.

简介：Onthebasisofdataofdriftingbottles'tracksandthecurrentmeasuredinanchoredstations,aswellastemperatureandsalinityobservedincruiseinvestigationsandcoastalstations,ADCPcurrentdataandAVHRRsurfaceseatemperature(SST)dataonthewesterncoastofGuangdong,syntheticresultsofanalysisshowedthatthecoastalcurrentsinthewestofthemouthoftheZhujiangRiverweremainlywestwardinsummer,whichconstitutedthenorthbranchofcyclonicgyreintheeastoftheQiongzhouStraits.PartofitswaterflowedwestwardintotheBeibuGulfthroughtheQiongzhouStraits.ThecoastalcurrentpatternwasnotidenticalwiththetraditionalcurrentsystemwhichflowedwestwardintheQiongzhouStraitsinwinterandeastwardinsummer.Thesummertime'scoastalcurrentwasalwayswestward,maybetemporarilyturningnortheastonlywhenthesouthwestwindwasstrong.TheimportantcharacteristicsofcoastalcurrentonthewesterncoastofGuangdong,intheQiongzhouStraitsandinthenorthoftheBeibuGulfwereanalyzedandtheirmechanismsalsowereexplained.

简介：全部的水银(THg)和甲基水银(MeHg)的集中为沿着福建省和东方广东省的沿海的线收集的32表面沉积被决定。THg和MeHg和他们的环境影响因素的空间分布被调查。在沉积的THg和MeHg的平均集中分别地是31.5ng/g和0.096ng/g。沉积THg和MeHg集中在Minjiang河口和Quanzhou和Putian的沿海的区域显示出相对高的价值。当到海岸线的距离增加了，集中总的来说减少了。在环境影响因素和THg之中的关联，MeHg被分析。沉积THg集中高度被相关到有机物，铜，全部的氮(TN)和全部的磷(TP)的集中，并且显著地相关到底部海水的pH价值和沉积硫化物的集中。沉积MeHg集中高度被相关到有机物和铜的集中，并且重要相关到硫化物，TN，TP和底部海水的pH价值的集中。