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社评“haya xorax”-知识课堂

兰州-西宁城haya xorax市群建成地震预测“时变地下云图”

来源: 中国证券网
2024-12-08 02:39:28

最佳回答

“haya xorax”兰州-西宁城haya xorax市群建成地震预测“时变地下云图”

  中新haya xorax社兰州12月7日电 (haya xorax冯志军 艾庆龙)作为中国地震多发频发省份之一,甘肃近年实施并完成刘家峡主动源重复探测项目,其与祁连山主动源形成青藏高原东北缘强震危险区的多主动源联合监测系统,该系统将为兰州-西宁城市群防震减灾提供“地下地图”,还可为地震预测提供“时变地下云图”。

  甘肃省地震局党组成员、副局长张元生7日接受中新社记者专访介绍说,该观测系统主要由甘青宁三省区的地震预警基准站网和激发点水下观测站组成,有效监测半径约300千米,覆盖面积可达28万平方千米,能够较好地监测南北地震带北段西部区域地下速度结构或应力状态的演化过程。

  甘肃省位于青藏高原东北缘,在大地构造上属于青藏、新疆和华北三大亚板块交界地带,被深大断裂交错切割,地貌反差强烈,是地壳物质最易变形和流动、构造运动极其强烈的地区,是中国地震多发省份之一。近些年,该省及周边区域发生夏河5.7级地震、青海门源6.9级地震、积石山6.2级地震等多次中强地震。

图为刘家峡主动源水上设施全貌。 (甘肃省地震局供图)

  “刘家峡水库主动源激发点年均水深约29米,水面宽约5千米,最低水位时水深约20米,是开展气枪主动源重复探测实验的理想场地。”张元生说,目前在南北地震带北段区域内已建成甘肃及邻省区域测震台网,刘家峡主动源定期在水下通过高压水枪激发,模拟产生地震波。

  刘家峡水库位于黄河上游,是中国第一个五年计划期间,中国自己设计、施工、建造的大型水电工程,竣工于1974年,兼有发电、防洪、灌溉、养殖、航运、旅游等多种功能。

  刘家峡水库地震监测区内曾发生过1927年甘肃古浪8.0级、1920年宁夏海原8.5级、1654年甘肃天水南8.0级和1879年甘肃武都南8.0级4次历史大地震。

图为工作人员对刘家峡主动源空压机进行检修作业。 (甘肃省地震局供图)

  张元生说,该系统对地下深部介质波速变化进行高精度连续监测,探索地下介质变化与构造活动及强震孕育发生的关系,haya xorax促进对地震孕育过程的认识,更好为地震监测预报服务提供科学支撑。

  “只有把地下搞清楚了,目前面临的很多困境才会得到解决。主动源也可以有效探测地下矿产资源、隐伏断层情况。”张元生表示,陆地气枪主动源是海洋深地探测技术转向陆地探测的标准,在积极推动地震学向时变地震学发展。主动源信号在地下结构精细化探测方面有着很大发掘空间,能够在强震发生前进行预警。(完)

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