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    教育頭條 > 小學家長 > 愛琴海海域強震已致土耳其20人遇難,科普地震知識小問答

    愛琴海海域強震已致土耳其20人遇難,科普地震知識小問答

    小學家長 10-31 瀏覽量: 分享:
           土耳其西部愛琴海海域30日發生6.6級地震,已造成土耳其至少12人死亡,數百人受傷。土耳其災害和應急管理部門說,地震發生在土耳其時間30日14時51分(北京時間19時51分),震級為6.6級,震源深度約為16.5公里。土耳其總統埃爾多安當天說,地震已造成至少12人死亡、438人受傷。


    地震給人類帶來了巨大的災難。在過去的20世紀,全世界因地震死亡的人數超過260萬,占全球自然災害所造成的死亡人數總和的55%。地震成為群災之首。為了更清楚了解地震小知識,三好網學管老師專門為大家展示關于地震知識系列問答,詳情如下:

    A、地震有前兆嗎?

    B、地震前在自然界出現的與地震孕育有關的現象稱之為地震前兆。地震是有前兆的,常見的現象有:

    小地震活動、地殼形變、地下水、地下氣體和地球電場、磁場、地應力場、重力場等各種微觀測量的變化。在臨近地震前還可以觀測到地下水位、水質的突變和地聲、地光、電磁干擾、動物行為異常等一系列宏觀異常變化。使用各種儀器和方法,觀測地震前這些微觀和宏觀異常,是專家們作為分析震情趨勢和地震預報的依據。

    一些動物(如蛇、鼠、狗等)的某些感覺器官特別靈敏,易于感知地下深處和周圍環境的微妙變化,引起動物的震前行為異常。其表現為極度緊張、驚慌恐懼、焦躁不安、狂奔亂跑、驚叫哀鳴或不思飲食、不進欄、圈等。一般動物的行為異常多數發生在震前24小時,臨震1-3小時內達到高潮。

    A、什么是地震預報 ?

    B、地震預報,是指用科學的思路和方法,對未來地震(主要指破壞性地震)的發震時間、地點和強度“三要素”作出預報。

    我國通過對孕震過程和地震前兆的深入研究,逐步發展了具有中國特色的地震預報方法,形成了“長、中、短、臨”的階段性漸進式地震預報的科學思路和工作程序。


    A、地震能預報嗎 ?

    B、從世界范圍看,地震預報仍處于探索階段,屬于尚未解決的科學難題之一,主要依靠積累觀測資料和震例分析進行經驗性預報。

    地震預報難度較大的原因主要有二:一是對地震的成因尚缺乏規律性認識,且地震前兆現象也很復雜;二是地震發生在地下深處,目前的科學技術水平難以直接探測震源深處的情況。

    我國的地震預報工作從1966年邢臺地震后開始的,經過四十年的探索和努力,已取得一定進展。目前我國對地震孕育發生的機理、規律有所認識,但還沒有完全認識;能對某些類型地震做出一定程度的預報,但還不能預報所有的地震;較大時間尺度的中長期預報已有一定的可信度,但短、臨預報的成功率相對較低。地震預報科學研究和應用實踐的歷史不長,與其他成熟學科相比僅剛剛開始,隨著科學技術的發展,經過長期探索和努力,人類一定會敲開“地震預報的大門”。

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